Updated on 2024/03/15

写真a

 
NISHIYAMA Satoshi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • (BLANK) ( 2003.3   Kyoto University )

Research Interests

  • Maintenance and management engineering

  • Geotechnical engineering

  • Measurement engineering

  • Civil engineering works

  • Natural disaster science

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering  / Natyral disaster science

Education

  • Kyoto university   School of engineering   Earth resource and energy engineering

    1984.4 - 1986.3

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  • Kyoto University   工学部   資源工学科

    1980.4 - 1984.3

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Research History

  • Okayama university   Environmental and life science   Professor

    2013.4 - 2018.12

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  • Kyoto University   Graduate School of Engineering   Associate Professor

    2010.4 - 2013.3

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  • Kyoto University   Graduate School of Engineering, Department of Urban and Environmental Engineering   Associate Professor

    2007.4 - 2010.3

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  • Kyoto University   Graduate School of Engineering, Department of Urban and Environmental Engineering   Associate Professor (as old post name)

    2004.3 - 2007.3

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  • Kyoto University   Graduate School of Engineering, Department of Civil Engineering Systems   Research Assistant

    2000.4 - 2004.3

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Professional Memberships

  • JAPAN SOCIETY OF CIVIL ENGINEERS

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  • THE JAPANESE GEOTECHNICAL SOCIETY

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  • THE MINING AND MATERIALS PROCESSING INSTITUTE OF JAPAN

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  • JAPANESE SOCIETY FOR ROCK MECHANICS

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  • JAPANESE ASSOCIATION OF GROUNDWATER HYDROLOGY

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  • THE SOCIETY OF EXPLORATION GEOPHYSICISTS OF JAPAN

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  • THE JAPAN LANDSLIDE SOCIETY

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  • JAPAN SOCIETY OF PHOTOGRAMMETRY AND REMOTE SENSING

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  • THE SOCIETY OF MATERIALS SCIENCE, JAPAN

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  • JAPAN SOCIETY OF ENGINEERING GEOLOGY

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Committee Memberships

  • 岡山市都市・消防政策審議会   会長  

    2022.10   

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  • 倉敷市総合浸水対策推進協議会   会長  

    2022.7   

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    Committee type:Municipal

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  • 岡山県   土地開発技術アドバイザー  

    2021.5   

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  • 一般社団法人 岩の力学連合会   常任理事  

    2021.4 - 2022.3   

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  • 地盤工学会 中国支部   商議員  

    2021.4 - 2022.3   

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  • 岡山県   道路防災ドクター  

    2021.1   

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    Committee type:Municipal

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  • 土木学会 土木情報学委員会 河川CIMに関わる基盤情報のリアルタイム更新に関する研究小委員会   委員  

    2020.10   

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    Committee type:Academic society

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  • 岡山市   岡山市浸水対策協議会会長  

    2020.4   

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    Committee type:Municipal

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  • 岡山市   産業廃棄物処理施設設置審議会委員委員長  

    2020.4   

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    Committee type:Municipal

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  • 一般社団法人日本道路建設業協会関西支部   アスファルト混合物事前審査委員会副委員長  

    2020.4   

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    Committee type:Academic society

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  • 国土交通省近畿地方整備局   新技術活用評価会議委員  

    2020.4   

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    Committee type:Government

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  • 国土交通省近畿地方整備局   大災害時における広域陸路に関する有識者会議委員  

    2020.4   

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    Committee type:Government

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  • 地盤工学会中国支部   代議員  

    2020.4 - 2021.3   

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    Committee type:Academic society

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  • 国土交通省岡山河川事務所   吉井川タイムライン,高梁川タイムライン座長  

    2020.3   

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    Committee type:Government

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  • 国土交通省   小田川合流点付替え事業 環境影響評価フォローアップ委員会委員  

    2020.3   

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  • 国土交通省中国地方整備局   道路防災ドクター  

    2020.3   

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    Committee type:Government

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Papers

  • 航空レーザ計測と洪水解析による植生抗力の3次元分布推定と竹林倒伏・木本流失の再現計算 Reviewed

    Ryo FURUTANI, Keisuke YOSHIDA, Takumi OKADA, Yuki KAJIKAWA, Satoshi NISHIYAMA

    Japanese Journal of JSCE   80 ( 16 )   n/a - n/a   2024

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejj.23-16161

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  • Mutual validation of remote hydraulic estimates and flow model simulations using UAV-borne LiDAR and deep learning-based imaging techniques Reviewed

    Md Touhidul Islam, Keisuke Yoshida, Satoshi Nishiyama, Koichi Sakai

    Results in Engineering   20   101415 - 101415   2023.12

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.rineng.2023.101415

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  • Detection and Segmentation of Riparian Asphalt Paved Cracks Using Drone and Computer Vision Algorithms Reviewed

    Intelligence, Informatics and Infrastructure   4 ( 2 )   35 - 49   2023.11

  • STUDY OF A METHOD FOR EXTRACTING SMALL-SCALE TOPOGRAPHIC IRREGULARITIES USING WAVELET ANALYSIS MAPS Reviewed

    Masafumi Imanishi, Koichi Nakamura, Satoshi Nishiyama

    International Journal of GEOMATE   25 ( 110 )   148 - 158   2023.9

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    Publishing type:Research paper (scientific journal)   Publisher:International Journal of Geomate  

    DOI: 10.21660/2023.110.3941

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  • 破堤における復旧作業へのUAVグリーンレーザ計測の適用 Reviewed

    井関 禎之, 間野 耕司, 堺 浩一, 西山 哲

    応用測量論文集   34   67 - 78   2023.8

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  • Landslide susceptibility mapping using automatically constructed CNN architectures with pre-slide topographic DEM of deep-seated catastrophic landslides caused by Typhoon Talas Reviewed

    Teruyuki Kikuchi, Koki Sakita, Satoshi Nishiyama, Kenichi Takahashi

    Natural Hazards   117   339 - 364   2023.5

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    Publishing type:Research paper (scientific journal)  

    There has been an increasing demand for detailed and accurate landslide maps and inventories in disaster-prone areas of subtropical and temperate zones, particularly in Asia as they can mitigate the impacts of landslides on social infrastructure and economic losses. Hence, in this study, models using automatically constructed high-performing convolutional neural network (CNN) architectures for landslide detection were applied and their outcomes were compared for landslide susceptibility mapping at the Kii peninsula, Japan. First, a total of 38 landslide and 63 non-landslide points were identified and divided into 70% and 30% of training and validation datasets, respectively. Eight landslide influence factors were used: slope angle, eigenvalue ratio, curvature, underground openness, overground openness, topographic witness index, wavelet, and elevation. These factors were selected using a 1-m DEM, which is easy to acquire and process data. Experimental results of model evaluation using receiver operating characteristics (ROC), area under the curve (AUC), and accuracy showed that the optimal models (ROC = 96.0%, accuracy = 88.7%) were more accurate than initial models (ROC = 91.1%, accuracy = 80.7%) in predicting landslides spatially. Furthermore, the landslide susceptibility mapping is consistent with the trends in the distribution of gentle slopes and knick lines unique to the study area and can be used as a powerful method for predicting landslides in future.

    DOI: 10.1007/s11069-023-05862-w

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  • Application of three-dimensional laser point cloud technology to river management Reviewed

    Nanoka Akiyama, Satoshi Nishiyama, Junsheng Song

    Rock Dynamics: Progress and Prospect   2   235 - 239   2023.5

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    Publisher:CRC Press  

    DOI: 10.1201/9781003359159

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  • Chapter Consideration of countermeasures using rockfall simulation by discontinuous deformation analysis Reviewed

    Hiroaki Kitauchi, Satoshi Nishiyama, Junsheng Song

    Rock Dynamics: Progress and Prospect, Volume 2   252 - 257   2023.5

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  • Three-dimensional monitoring of slope deformation using digital photogrammetry Reviewed

    412 - 417   2023.5

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  • Automatic extraction of rockfall source based on terrain analysis map using support vector machine Reviewed

    Naoko Sakamoto, Koki Sakita, Satoshi Nishiyama, Teruyuki Kikuchi, Junsheng Song, Yuzo Ohnishi

    Rock Dynamics: Progress and Prospect, Volume 2   240 - 245   2023.5

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  • Multi-Modal Deep Learning Detection of Deep-Seated Gravitational Slope Deformation by Typhoon Talas in 2011 Reviewed

    63 ( 6 )   277 - 290   2023.2

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  • Three-dimensional numerical modelling of floods in river corridor with complex vegetation quantified using airborne LiDAR imagery Reviewed

    Keisuke Yoshida, Yuki Kajikawa, Satoshi Nishiyama, Md. Touhidul Islam, Shin Adachi, Koichi Sakai

    Journal of Hydraulic Research   61 ( 1 )   88 - 108   2023.1

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    Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/00221686.2022.2106596

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  • Design of falling rock preventive countermeasure based on three-dimensional simulation Reviewed

    H Kitauchi, S Nishiyama, J Song

    IOP Conference Series: Earth and Environmental Science   1124 ( 1 )   252 - 257   2023.1

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    Abstract

    To rationally design rockfall countermeasures, detailed rockfall behavior must be predicted using numerical simulations based on the conditions of slopes and rockfalls. In this study, we perform a rockfall simulation using discontinuous deformation analysis. This method is used to analyze the motion between blocks composed of polygons of arbitrary elastic bodies; furthermore, the energy conservation law and the uniqueness/convergence of the solution are guaranteed for the entire analysis target. Additionally, the rockfall shape is reproduced in detail. Both the rockfall shape and a parameter known as the velocity energy ratio, which indicates the decay of energy at the collision time of the rockfall, significantly affect the rockfall behavior. In this study, we model the actual slope shape from data measured via airborne laser and quantitatively evaluate the effect via simulations by changing the rockfall shape and velocity energy ratio. In this paper, we consider how to use the simulation for the design of rockfall countermeasures based on the results such as the change in the amount of jumping due to the difference in slope shape, geology, and rockfall shape.

    DOI: 10.1088/1755-1315/1124/1/012092

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    Other Link: https://iopscience.iop.org/article/10.1088/1755-1315/1124/1/012092/pdf

  • UAV写真を用いた不法投棄物の把握 Reviewed

    Sadayuki ISEKI, Mitsugu FUNADA, Satoshi NISHIYAMA

    Japanese Journal of JSCE   79 ( 22 )   ID: 22-22014   2023

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejj.22-22014

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  • 旭川中原橋周辺の河道形状及び植生分布の違いが更正係数に与える影響に関する数値的検討 Reviewed

    安達森, 梶川勇樹, 吉田圭介, 西山哲

    土木学会論文集B1(水工学)   78 ( 2 )   I_1153 - I_1158   2022.11

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  • The application of drone-assisted deep learning technology in riverbank garbage detection Reviewed

    Shijun PAN, Keisuke YOSHIDA, Afia S. BONEY, Satoshi NISHIYAMA

    Journal of JSCE, B1   78 ( 2 )   I_133 - I_138   2022.11

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejhe.78.2_i_133

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  • Promises and uncertainties in remotely sensed riverine hydro-environmental attributes: Field testing of novel approaches to unmanned aerial vehicle-borne lidar and imaging velocimetry Reviewed

    Md Touhidul Islam, Keisuke Yoshida, Satoshi Nishiyama, Koichi Sakai, Shin Adachi, Shijun Pan

    River Research and Applications   38 ( 10 )   1757 - 1774   2022.8

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    Publishing type:Research paper (scientific journal)  

    Recent advancements in remotely sensed techniques have markedly expanded data acquisition potential in riverine studies, but the techniques' applicability must be validated and improved because of uncertainties associated with diverse field conditions. This study is the first experimental evidence of using a newly designed unmanned aerial vehicle (UAV)-borne green lidar system (GLS) and deep learning-automated space–time image velocimetry (STIV) for remote investigation of hydraulic and vegetation quantities of the gravel-bed Asahi River in Okayama Prefecture, Japan. In addition to identifying bed deformation in waters shallower than 2 m, the GLS point clouds characterized the submerged infrastructure with block detailing patterns, thereby identifying positional displacement and severely damaged parts. This paper also presents a noncontact method of estimating incremental river discharge. Compared to benchmarked flow model estimates, remotely sensed discharges for three transects covering shallower, deeper, and partially submerged woody vegetation areas were overestimated by 1–11%, with 4% underestimation for another cross-section. The STIV analysis also showed complicated flow patterns that were reasonably confirmed by flow vectors from depth-averaged modeling. Ultimately, depth-averaged flow model estimates validated hydraulic parameters derived remotely from GLS and STIV, and vice versa. In addition to approximating vegetation growth rates, the study using GLS attributes accurately identified riparian vegetation types as herbaceous (70%), woody (86%), and bamboo groves (65%). Finally, our findings provide insight into the management of shallow clear-flowing vegetated rivers and remote sensing of streamflow to validate hydrodynamic-numerical methods.

    DOI: 10.1002/rra.4042

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  • Extension simplified seepage analysis system assessment of water inflow quantity during a tunnel construction and its application to an actual tunnel construction Reviewed

    Yasuyuki KUBOTA, Moritada MORI, Toru YASUDA, Tomofumi KOYAMA, Satoshi NISHIYAMA

    Japanese Geotechnical Journal   17 ( 2 )   135 - 145   2022.6

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    Publishing type:Research paper (scientific journal)   Publisher:The Japanese Geotechnical Society  

    DOI: 10.3208/jgs.17.135

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  • Identification of rockfall source based on terrain analysis map using support vector machine Reviewed

    SAKITA Koki, KIKUCHI Teruyuki, NISHIYAMA Satoshi

    Japanese Geotechnical Journal   17 ( 2 )   147 - 157   2022.6

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    Language:Japanese   Publisher:The Japanese Geotechnical Society  

    This study presents an identification method for rockfall sources, using remote sensing and machine learning technology, to reduce overlooking during the inspection cycle and improve slope management efficiency. In road disaster prevention inspections, rockfall damage from overlooked points has been reported, and improvements are essential to ensure that road disaster prevention inspections are carried out. In such cases, the use of remote sensing technology is an effective measure. In particular, effective inspection can be expected by utilizing the terrain analysis map created from the measurement data. In this research, we propose a system that applies machine learning to object detection to a terrain analysis map and detects the source of rockfall on the desk. Based on the wavelet analysis map, which is a type of terrain map, object detection by a support vector machine was applied. As a result, the proposed method succeeded in detecting all existing inspection points. We showed its effectiveness as a tool for improving the efficiency of road disaster prevention inspections.

    DOI: 10.3208/jgs.17.147

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  • SOURCE EXTRACTION OF ROCKFALL BY MICROTOPOGRAPHY HIGHLIGHT MAP VIA HIGH-DENSITY AERIAL LASER SURVEY Reviewed

    Koki Sakita, Teruyuki Kikuchi, Satoshi Nishiyama

    International Journal of GEOMATE   22 ( 94 )   1 - 12   2022.6

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    Investigations using maps that reflect slope conditions have been conducted for slope inspection. However, oversight at the time of inspection has become a problem owing to unsatisfactory map performance. This paper presents a microtopography highlight map created using a high-density aerial laser survey as a new inspection tool and evaluates the influence of survey conditions on a desk study of rockfall sources using the map to develop an efficient slope inspection method. The microtomography highlight map is created by the combination of a slope map, which displays the slope angles, and a wavelet analysis map, which displays the unevenness of the slope. The slope and wavelet analysis maps are created via terrain analysis based on the digital elevation model, which is created using aerial laser survey results. In this study, we demonstrated slope inspection using a map of grid size 50 cm on two slopes where there was a risk of falling rocks. A comparison of the desk study and field research showed that using the map was effective in extracting the source of the rockfall (>2 m height). In addition, the verification results showed that the measurement conditions affect the representation of the map, and that the measurement should be conducted in winter to produce a more detailed map, which leads to effective inspection.

    DOI: 10.21660/2022.94.j2392

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  • Airborne LiDAR-assisted deep learning methodology for riparian land cover classification using aerial photographs and its application for flood modelling Reviewed

    Keisuke Yoshida, Shijun Pan, Junichi Taniguchi, Satoshi Nishiyama, Takashi Kojima, Md. Touhidul Islam

    Journal of Hydroinformatics   24 ( 1 )   179 - 201   2022.1

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    Publishing type:Research paper (scientific journal)   Publisher:IWA Publishing  

    <title>Abstract</title>
    In response to challenges in land cover classification (LCC), many researchers have experimented recently with classification methods based on artificial intelligence techniques. For LCC mapping of the vegetated Asahi River in Japan, the current study uses deep learning (DL)-based DeepLabV3+ module for image segmentation of aerial photographs. We modified the existing model by concatenating data on its resultant output port to access the airborne laser bathymetry (ALB) dataset, including voxel-based laser points and vegetation height (i.e. digital surface model data minus digital terrain model data). Findings revealed that the modified approach improved the accuracy of LCC greatly compared to our earlier unsupervised ALB-based method, with 25 and 35% improvement, respectively, in overall accuracy and the macro F1-score for November 2017 dataset (no–leaf condition). Finally, by estimating flow-resistance parameters in flood modelling using LCC mapping-derived data, we conclude that the upgraded DL methodology produces better fit between numerically analyzed and observed peak water levels.

    DOI: 10.2166/hydro.2022.134

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  • Characterizing vegetated rivers using novel unmanned aerial vehicle‐borne topo‐bathymetric green lidar: Seasonal applications and challenges Reviewed

    Md. Touhidul Islam, Keisuke Yoshida, Satoshi Nishiyama, Koichi Sakai, Tomoyuki Tsuda

    River Research and Applications   38 ( 1 )   44 - 58   2022.1

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1002/rra.3875

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/rra.3875

  • Drone-LiDAR-assisted Image Fusion methodology for Deep Learning-based Land Cover Classification Reviewed

    Shijun PAN, Keisuke YOSHIDA, Takashi KOJIMA, Satoshi NISHIYAMA

    Artificial Intelligence and Data Science Published by Japan Society of Civil Engineers   3 ( 3 )   15 - 2   2022

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    Language:English   Publisher:Japan Society of Civil Engineers  

    This study uses an unmanned aircraft mounted green Light Detection and Ranging (LiDAR) system to verify the learnability associated with deep learning regarding land cover classification (i.e., evaluated by the average and the absolute difference value of label-based F1, overall accuracy or Macro F1 under the premise of cross-seasonal mutual-prediction). Image fusion method in this study mainly attempts to superimpose the visualized LiDAR data with the aerial photographs to provide new features. LiDAR data are visualized using high contrast color scale (default), average high contrast color scale (same color, different split points as default), and high contrast gray color scale (different color, same split points as default). The reason of setting these methods is to compare the impact of split points and point-associated color in the color scale on learnability of cross-seasonal data. It is worth noting, however from the view of the results, that relying solely on aerial photographs is not sufficient, comparing with image fusion method, especially when training and predicting using cross-seasonal data. From the comparison of the label-based F1, this study has proved the necessary impact of LiDAR on vegetation label-based land cover classification.

    DOI: 10.11532/jsceiii.3.3_15

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  • NUMERICAL INVESTIGATION FOR THE IMPACT OF CHANNEL GEOMETRY AND VEGETATION CONDITION ON SURFACE VELOCITY COEFFICIENT AROUND THE NAKAHARA BRIDGE IN THE ASAHIKAWA RIVER Reviewed

    Shin ADACHI, Yuki KAJIKAWA, Keisuke YOSHIDA, Satoshi NISHIYAMA

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   78 ( 2 )   I_1153 - I_1158   2022

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Civil Engineers  

    DOI: 10.2208/jscejhe.78.2_i_1153

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  • QUANTIFYING THE SLOPE DEFORMATION OF A LASER POINT CLOUD ACQUIRED USING MOBILE MAPPING SYSTEM Reviewed

    Naoto Samori, Satoshi Nishiyama, Koki Sakita

    21 ( 88 )   12 - 21   2021.12

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  • Flood risk assessment in vegetated lower Asahi River of Okayama Prefecture in Japan using airborne topo-bathymetric LiDAR and depth-averaged flow model Reviewed

    Keisuke Yoshida, Kimihisa Nagata, Shiro Maeno, Koji Mano, Shinya Nigo, Satoshi Nishiyama, Md. Touhidul Islam

    JOURNAL OF HYDRO-ENVIRONMENT RESEARCH   39   39 - 59   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER  

    This paper describes application of airborne LiDAR bathymetry (ALB) with near-infrared and green pulsed lasers for gathering distributed vegetation conditions and topo-bathymetric data for rivers. For the lower Asahi River of Okayama Prefecture in Japan, the ALB data validity was verified using field observation data. This study also examined the applicability of ALB data for numerical simulations of the lower Asahi River flooding in early July 2018 in Japan, comparing simulated and observed data. Results demonstrated that the methodology for this study works well for parameterization of distributed vegetation on a reach scale. This study also applied numerical tests to investigate the effects of vegetation establishment on flood control plans for the lower Asahi River using parameters validated for flood flow simulations. Results demonstrate that the predicted water level markedly exceeds the high water level because of thick vegetation presently established along few-kilometerlong upstream sections of the targeted river reach. Therefore, we conclude that the present findings can support cost-effective management tasks for vegetated rivers.

    DOI: 10.1016/j.jher.2021.06.005

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  • Automatic extraction of rockfall source based on terrain analysis map using support vector machine Reviewed

    Koki Sakita, Teruyuki Kikuchi, Satoshi Nishiyama, Junsheng Song, Yuzo Ohnishi

    IOP Conference Series: Earth and Environmental Science   861 ( 4 )   042048 - 042048   2021.10

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    Publishing type:Research paper (scientific journal)   Publisher:IOP Publishing  

    DOI: 10.1088/1755-1315/861/4/042048

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    Other Link: https://iopscience.iop.org/article/10.1088/1755-1315/861/4/042048/pdf

  • River Levees Monitoring Using Three Dimensional Laser Point Clouds with SLAM Technology Reviewed

    Nanoka Akiyama, Satoshi Nishiyama, Koki Sakita, Junsheng Song, Fumiaki Yamazaki

    Advancements in Geotechnical Engineering   14 - 22   2021.7

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  • DEVELOPMENT OF A TUNNEL FACE ROCK FALLS MONITORING SYSTEM WITH IMAGE PROCESSING Reviewed

    KUBOTA Yasuyuki, NISHIYAMA Satoshi, YABUKI Nobuyoshi, FUKUDA Tomohiro, TEDUKA Hitoshi, OBATA Hiroshi, MURAKAMI Osamu

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics)   77 ( 2 )   I_77 - I_88   2021

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    <p> During the construction work of mountain tunnels, monitoring the tunnel face is required all the time to prevent labor accidents. Small rock falls can be a sign of a large scale collapse, despite the time lag between them. However, it is difficult for the supervisor to detect small rock falls by visual monitoring. Therefore, in this research, a monitoring system was developed for detecting falling objects based on the background substraction. In order to monitor small rock falls, we limited the analysis scope of detecting falling objects process to the tunnel face which was detected by semantic segmentation and removed minute objects such as tunnel dust and video noise. Next, we conducted an image analysis by the developed system using footages which simulate falling rocks, the sign of a large scale collapse. The result showed that small rock falls could be detected, which implies the mitigation of labor accidents.</p>

    DOI: 10.2208/jscejcei.77.2_I_77

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  • INVESTIGATION ON RIVER STRUCTURE INSPECTION BY UAV GREEN LIDAR Reviewed

    Advances in River Engineering   27   51 - 56   2021

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    DOI: 10.11532/river.27.0_51

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  • INFLUENCE OF FLOW DIMENSION ON PREDICTION OF SPRING WATER FOR MOUNTAIN TUNNEL EXCAVATION Reviewed

    Moritada Mori, Yasuyuki Kubota, Toru Yasuda, Satoshi Nishiyama

    International Journal of GEOMATE   18 ( 70 )   162 - 171   2020.6

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  • THREE-DIMENSIONAL FLOOD SIMULATION AROUND THE LOWER ASAHI RIVER FIXED DIVERSION WEIR CONSIDERING DISTRIBUTED VEGETATION CONDITIONS DURING THE HEAVY RAIN EVENT OF JULY 2018 Reviewed

    YOSHIDA Keisuke, KAJIKAWA Yuki, NAGATA Kimihisa, NISHIYAMA Satoshi, MANO Koji, SAKAI Koichi, ISLAM Md. Touhidul, NIGO Shinya

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   76 ( 2 )   I_985 - I_990   2020

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    Language:Japanese   Publisher:Japan Society of Civil Engineers  

    <p> Flooding with a discharge of approximately 4200 m3/s occurred in the lower Asahi River during the Heavy Rain Event of July 2018. The flood flow over the historic diversion weir was the first time ever observed after its renewal work. For flood control tasks, hydraulic engineers have examined the diversion discharge by laboratorial experiments and two-dimensional (2-D) numerical simulations. However, the flood impacts on the subsequent changes of both vegetation and riverbed conditions have not been fully investigated yet in the earlier works. Furthermore, the 2-D flow model commonly cannot allow for reproducibility of flows around the actual river section with a complicated bed geometry and heavily vegetated conditions. Therefore, a new 3-D numerical model has been proposed herein for flood flow simulation based on a porous model considering distributed vegetation establishment using airborne laser bathymetry (ALB) data before and after the rainfall event. Simulated results demonstrated that the proposed model performed well, compared with the existing 2-D model and field observations.</p>

    DOI: 10.2208/jscejhe.76.2_I_985

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  • Perception of Measurement accuracy and characteristics for Green LiDAR Drone system Reviewed

    31   99 - 110   2020

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    Language:Japanese  

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  • Topographic Interpretation and Quantification of Landslide Terrain Deformation Using Aerial Laser Measurement Data Reviewed

    KIKUCHI Teruyuki, SAKITA Koki, HATANO Teruyoshi, NISHIYAMA Satoshi

    Geoinformatics   31 ( 2 )   37 - 45   2020

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    <p>This study investigates the three-dimensional point cloud density necessary to quantify topography for prediction purposes. Index parameters have been collected for main scarps, flanks, scarplets, open cracks, and gravitational deformations, all of which are elements relevant to topographic interpretation. However, no comparison has been made between point density and qualitative terrain interpretation using aeronautical laser measurement methods and equipment. The study compares the point cloud acquisition efficiency of two different laser scanning systems, ALS and UAV, using seven different point cloud densities. In this paper, we examine the equipment, measurement accuracy, and topographically interpretable fine topography by applying the scanning systems at a rock fall site where measurements were taken 4 times. We found that a small cliff, 0.3 m tall, on a gentle slope can be detected at a point density of 1.0 point/m2, and that detection of a 0.45 meter tall cliff on a steep slope is possible with a point density of 59 points/m2.</p>

    DOI: 10.6010/geoinformatics.31.2_37

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  • MODEL-INDUCED COMPARATIVE STUDY OF ALB AND UAV-BORNE GREEN LIDAR SYSTEMS ON VEGETATED LOWER ASAHI RIVER ASSESSMENT IN JAPAN Reviewed

    Md. Touhidul ISLAM, Keisuke YOSHIDA, Koichi SAKAI, Satoshi NISHIYAMA, Tomoyuki TSUDA, Kimishisa NAGATA, Shiro MAENO

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   76 ( 2 )   I_529 - I_534   2020

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    DOI: 10.2208/jscejhe.76.2_i_529

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  • Verification of microtopographic features of landslide or non-landslide area in Typhoon Talus in 2011 Reviewed

    KIKUCHI Teruyuki, HATANO Teruyoshi, NISHIYAMA Satoshi

    Journal of the Japan Landslide Society   56 ( 4 )   141 - 152   2019

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    <p>  The 2011 Typhoon Talus caused slope damage in the Kii Peninsula. This study reviews the landslide indicators and determines the microtopography of 38 areas affected by landslides caused by the typhoon along with 63 unaffected areas. Results indicate that the areas associated with collapse have gravitationaldeformation, exhibiting end collapses with high probabilities. These topographic combinations are characterized by gravitational creep, such as the appearance of the main scarp on the earth's surface in areas characterized by surface ruptures. In the landslide development stage, these microtopographies relate to a transitional stage recognized as a change in gravity prior to initial fluctuation and can be classified into two periods depending on their frequency. Although these factors are limited to specific meteorological conditions, topography, and geological structures, they can be used to effectively forecast slope damage in areas with existing high-precision DEM data.</p>

    DOI: 10.3313/jls.56.141

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  • Study on Calibration for UAV LiDAR System Reviewed

    30   63 - 74   2019

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  • Study on Acquisition Method and Utilization of Three Dimensional Data for Topographical Survey of Levee Reviewed

    SAKITA Koki, NISHIYAMA Satoshi

    Geoinformatics   30 ( 3 )   101 - 109   2019

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    <p>In recent years, due to climate change, heavy rainfall has occurred frequently, and the damage caused by inundation has increased. However, the soundness of the levee is done by the visual inspection while experts walk. Therefore, it is evaluated depending on the skills and experience of the experts. There has been a need for a method that can monitor the outer shape of the levee in detail in normal times and after flooding, and to conduct quantitative evaluation for taking measures immediately if abnormalities such as deformation are found. Mobile Mapping System (MMS), which is equipped with a laser scanner on a vehicle, has attracted attention as a method that can quickly carry out high-precision surveying. When the survey is conducted by using MMS that travels on the levee crown, a dead angle of laser irradiation occurs. It is possible to detect the subsidence of the levee crown with high accuracy, but it is not possible to detect where it is necessary to take measures in the whole levee including the slope surface by using MMS survey. In this paper, we clarified what kind of problem the dead angle of the laser light leads to, and discussed the advantages of acquiring 3D data for grasping the topography of the levee by irradiating the laser from a high position. We showed the relation between the laser irradiation angle and the traveling speed of the vehicle and the surveying accuracy, and considered the position to install the laser scanner device to acquire the 3D data up to the slope toe area. We also verified the effectiveness of the laser surveying which irradiates from the 5.5m height. In comparison with the conventional laser surveying by vehicle travel, it was demonstrated that the method we considered was efficient as a surveying work and detected a detailed deformation on the slope surface because it provided high density laser point clouds. Since the heavy rainfall of short duration will increase in the future, it is expected that the results of this study are considered to be useful as a method for efficiently grasping the topographical features of the levee.</p>

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  • Automatic differenciation of failure and non failure sites using deep learning Reviewed

    菊地輝行, 崎田晃基, 秦野輝儀, 吉川慶, 西山哲, 大西有三

    日本地すべり学会誌   56 ( 5 )   255 - 263   2019

  • 車載写真レーザ測量システムを用いた視距不良区間の自動抽出技術 Reviewed

    吉川慶, 島田英之, 井上薫, 林照悟, 西山哲

    交通科学   48 ( 2 )   72‐73   2018.3

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  • Assessment of steep slope movements using point cloud data-For preliminary survey of slope maintenance- Reviewed

    菊地輝行, 秦野輝儀, 千田良道, 西山哲

    日本地すべり学会誌   55 ( 2 )   65‐71 - 71   2018.3

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    &lt;p&gt;  In slope disasters which increase recently, falling rocks from steep slopes occur even checked-location by preliminary survey. It is important to confirm the existence of falling rock and its origin corresponding to the preliminary survey in the steep slope maintenance, but it has problems of visibility as vegetation and steep slope safety. The efficiently preliminary survey has important to take acquire detailed topographical data. Airborne Laser Scanning and Terrestrial Laser Scanning with remarkable improvement in performance has been widely known as a surveying technique for acquiring topographic data with a high accuracy. &lt;/p&gt;&lt;p&gt;  In this study, Three-dimension point cloud by aircraft and terrestrial laser Scanning were used in combination with objects on steep slopes facing river. Scanning were made at multiple times. We have evaluated the landslide variation amount with a high accuracy by discriminating characteristic land features from digital elevation model, which is Substratum Digital Elevation Model (S-DEM)and ICP analysis. We also describe the result that it is possible to predict the movement of steep slope occurred in the area. These methods are effective of the preliminary survey for steep slope maintenance.&lt;/p&gt;

    DOI: 10.3313/jls.55.65

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  • STUDY ON THE IMPROVEMENT EFFECT OF APPLICATION OF ALB FOR RIVER CHANNEL TOPOGRAPHY ON RIVER-BED VARIATION ANALYSIS Reviewed

    YAMAGUCHI Kaho, YOSHIDA Keisuke, MAENO Shiro, MANO Koji, AKOH Ryosuke, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   74 ( 2 )   I_465 - I_474   2018

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    Developing technologies of Airborne Laser Bathymetry (ALB) have recently enabled us to obtain topographical data on river channels including underwater area. The reproducibility of river channel topography is estimated to effect on numerical analysis for river. However, there are few studies using ALB data, so the effect of it on analysis results has not been considered in particular.<br>In this study, the topography data obtained by ALB measurement is examined the accuracy. Furthermore, we studied the effect of the topography data on analysis by comparing results of river-bed variation analysis and the difference data of ALB measurement.<br>The topography data obtained ALB measurement showed the same topographical shape as cross-sectional survey result. In addition, by comparing analysis results and the difference data of ALB measurement, analysis using ALB data showed a trend similar to measured value than using conventional data.

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  • METHOD FOR EFFICIENT FALLING ROCK INVESTIGATION USING TABLET TYPE GIS AND MICROTOPOGRAPHY HIGHLIGHT MAP Reviewed

    YOSHIKAWA Kei, MIYASHITA Masashi, HAMADA Nobuhisa, SAKITA Koki, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics)   74 ( 2 )   I_121 - I_131   2018

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    &nbsp;This article examined efficient method for falling rock investigation using tablet type GIS and microtopography highlight map. In the experiment field, it was possible to extract a steep cliff with a height difference of about 1.5m or more and an inclination angle of 60&deg; or more from microtopography highlight map, but it was also confirmed the necessity of field investigation including risk judgment. In the field investigation, we verified the relationship between the microtopography highlight map and the self position indicated by the tablet terminal at the slope of the mountain, and it was effective for approaches to falling rock source. Moreover accumulation of investigation data using tablet type GIS not only contributes to the efficiency improvement of disaster prevention record update but also it is effective for future maintenance because it also has position repeatability of falling rock source.

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  • STUDY ON SLOPE STABILITY EVALUATION IN CONSIDERATION OF SEEPAGE PRESSURE IN THE UNSATURATED ZONE Reviewed

    笹井 友司, 西垣 誠, 西山 哲

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE   62   Ⅰ_13 - 18   2018

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  • STUDY ON SLOPE STABILITY EVALUATION IN CONSIDERATION OF SEEPAGE PRESSURE IN THE UNSATURATED ZONE Reviewed

    SASAI Yuji, NISHIGAKI Makoto, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   74 ( 4 )   I_13 - I_18   2018

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    &nbsp;While slope failures due to torrential rain occurs frequently in all over the country, it is used two-dimensional saturated-unsaturated flow analysis by finite element method and limit equilibrium method in many of the design practices and various research. In addition, osmosis water pressure of the unsaturated zone obtained by flow analysis is not considered to slope stability evaluation. Therefore, in this study, the coupling was carried out analysis of the seepage and stress by the shear strength reduction method using a simple model of masa soil. In addition, osmotic pressure and torrential rains of the unsaturated zone was carried out the impact study on the stability of the slope. And it was further applicability verification of the design practices of the limit equilibrium method by comparison with the sliding safety factor by comparison with the conventional method. It showed that conventional method is not applicable cases.

    DOI: 10.2208/jscejhe.74.I_13

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  • フトンカゴと補強材一体構造の擁壁的な挙動 Reviewed

    川崎始, 西山哲, AUNG Hla, 久保幹男

    地盤と建設   35 ( 1 )   197‐204   2017.12

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  • 3次元レーザ点群による河川堤防点検手法の開発 Reviewed

    藤木三智成, 西山哲, 井上浩一, 阿部亮吾

    地盤と建設   35 ( 1 )   145‐153   2017.12

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  • マサ土斜面の安定性評価に用いる降雨条件の提案 Reviewed

    笹井友司, 西垣誠, 西山哲

    地盤と建設   35 ( 1 )   169‐176   2017.12

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  • MMSによる河川堤防の変形・沈下把握に関する研究 Reviewed

    間野耕司, 井関禎之, 森田真一, 橘菊生, 西山哲

    測量   67 ( 11 )   14‐17 - 74   2017.11

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  • 車載写真レーザ測量システムを用いた視距不良区間の自動抽出技術 Reviewed

    吉川慶, 島田英之, 井上薫, 林照悟, 西山哲

    交通科学   48 ( 1 )   26‐36   2017.9

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  • Development of Analytic Method for Landslide Measurement by Movement Vectors Using S-DEM Data Obtained from Airborne Laser Point Clouds Reviewed

    57 ( 6 )   277 - 288   2017.2

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  • DEVELOPMENT OF &ldquo;MOBILE IMAGING SYSTEM&rdquo; FOR EFFICIENT AND SUSTAINABLE ROAD MAINTENANCE MANAGEMENT IN LOCAL GOVERNMENT Reviewed

    SHIOZAKI Masando, KAWAMURA Kei, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics)   73 ( 2 )   I_141 - I_146   2017

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    &amp;nbsp;In the &quot;Periodic inspection rocedures&quot; of various road structures formulated in June, 2014, it is mandatory to make the regular inspection for existing road structures once every five years. For this reason, technological development for an efficient maintenance management was pointed out as an urgent task. &amp;ldquo;Mobile Imaging System&amp;rdquo;, which was developed few year ago, measures road structures by using digital video camera and laser scanner mounted on a specialized vehicle. In addition, the measuring precision is high. However, in many cases the operation cost is expensive. Therefore, it is difficult for local government with budget limitation to apply it to the regular inspection. Authors has developed a reasonable &amp;ldquo;Mobile Imaging System&amp;rdquo;, that is an mountd on a maintenace patrol car, measurement accuracy same as a specialized vehicle, decomposable and has developed an image stiching program for panoramic images.

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  • VERIFICATION OF SPECIFICATION METHOD OF FALLING ROCK GENERATION SOURCE USING HIGHLIGHTING MAP OF MICROGEOMORPHOLOGY CREATED BY HIGH DENSITY AERIAL LASER DATA Reviewed

    MIYASHITA Masashi, IMANISHI Masafumi, MIYATA Masataka, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics)   73 ( 2 )   I_92 - I_108   2017

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    &nbsp;In recent years, falling rock accidents have occurred frequently, and the momentum to tackle the rock fall prevention measures is increasing. However, in lots of the falling rock prevention measures, low resolution drawings are used. Therefore, the investigating falling rocks in the field and the accuracy of the position of the falling rock generation source are poor. There is a problem of missing a place where there is a danger of falling rocks.<br>&nbsp;In this paper, we utilize high density laser point cloud data using aircraft and create a map that emphasizes micro topography. This map is a transparent composition of the inclination amount map, the wavelet analysis diagram and the contour map together. We propose a method for extracting the falling rock origin with a high accuracy by using it. As a result of verifying the laser point cloud data in summer and winter, we could extract the falling rock generation source &ldquo;cliff&rdquo; by using measurement data of the longitudinal direction of the road in winter. This clarified that the proposed method is useful.

    DOI: 10.2208/jscejcei.73.I_92

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  • HEIGHT MEASUREMENT OF RIVER BANK CROWN BY MMS Reviewed

    間野耕司, 井関禎之, 森田真一, 橘菊生, 西山哲

    土木学会論文集 F3(土木情報学)(Web)   73 ( 2 )   I_53‐I_64(J‐STAGE)   2017

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  • HEIGHT MEASUREMENT OF RIVER BANK CROWN BY MMS Reviewed

    MANO Koji, ISEKI Sadayuki, MORITA Shinichi, TACHIBANA Kikuo, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics)   73 ( 2 )   I_53 - I_64   2017

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    &nbsp;This paper describes the applicability assessment of height measurement of river bank crown by Mobile Mapping System (MMS). The aim of this study is to establish MMS measurement method and extract height of river bank crown methodology from MMS point cloud. Our proposed methodology is the approach based on flatness and continuousness form of river bank crown. In order to examine our methodology, we had been carried out an actual MMS observation and MMS point cloud generation. Through our practical experiments and an actual evaluation, we confirmed that our proposed methodology can evaluate less than 10cm accuracy and continuousness height of river bank crown. It was also concluded that the MMS is the most appropriate method in terms of the efficient and effective river bank height management.

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  • RESEARCH ON IMAGE PROCESSING METHOD FOR MONITORING OF TUNNEL FACE DEROFMATION Reviewed

    NAKAMURA Takafumi, FUJIOKA Daisuke, NAKAOKA Kenishi, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics)   73 ( 2 )   I_226 - I_233   2017

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    &nbsp;In the construction work of the mountain tunnel, it is a problem that workers are injured due to disaster caused by fall of rock. In ordet to prevent labour accidents , it is important to monitor deformation of tunnel face during work constantly. However, it has been difficult to detect the deformation by visual monitoring of the supervisor. Therefore, we have been developing tunnel face deformation monitoring system using background subtraction which is a method of image processing to detect moving objects. In this study, in order to make it possible to monitor the deformation by image analysis, we examined the applicability to the site from analysis results of videos moving rock and that excavating tunnel face. As a result, it was found that it is expected to detect the deformation that is difficult by visual monitoring, and to detect only the deformation by removing moving objects other than deformation. Finally, we indicated possibility that the risk of accidents is reduced.

    DOI: 10.2208/jscejcei.73.I_226

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  • INSPECTION OF THE CRACK MEASUREMENT OF THE ROAD TUNNEL BY MOBILE IMAGING TECHNOLOGY Reviewed

    MIZUGUCHI Takashi, OHNISHI Yuzo, TOKUDA Koichiro, NISHIYAMA Satoshi, ISHIMURA Katsunobu

    Journal of Japan Society of Civil Engineers, Ser. F2 (Underground Space Research)   73 ( 1 )   1 - 10   2017

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    &amp;nbsp;Because road tunnel inspection manual was revised in June, 2014, the periodic inspection once in five years was required. There are many road tunnels of 11,000 in Japan, development of inspection technology, and securing of talented person becomes important. As an inspection robot technology, MIMM (Mobile Imaging Technology System &amp; Mobile Mapping System) attracts attention now. In this research, we weighed MIMM measurement result against a proximity viewing result in a real tunnel and carried out the quality inspection of the crack.

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  • EXAMINATION OF THE ROAD SURFACE PROFILE MEASUREMENT TECHNIQUE USING THE MMS Reviewed

    INOUE Koichi, SUZUKI Tatsuro, ABE Ryogo, FUJIKI Michinari, NISHIYAMA Satoshi

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)   73 ( 3 )   I_63 - I_70   2017

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    &amp;nbsp;The lack of resources and the talented person concerned with maintenance becomes the serious problem. Active introduction of ICRT is expected as one of the solutions. In late years it is in condition to be able to utilize a profit by measurement data because MMS (Mobile Mapping System) is utilized in various scenes. We think that it becomes the most effective data use to utilize data of MMS versatilely. Therefore, it is necessary to acquire data in a general viewpoint of the road management. We calculated IRI from the road surface profile that I made by data of standard MMS and inspected the usefulness of acquisition data. As a result, we demonstrated that IRI calculation was possible by the road surface profile that we made from laser and POS/LV of standard MMS.

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  • 浸透水圧を考慮した斜面の安定性評価と簡易的な評価手法の提案 Reviewed

    笹井友司, 西垣誠, 西山哲, 松井章弘

    地盤と建設   34 ( 1 )   29‐36   2016.12

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  • 車両移動計測手法の河川堤防点検への適用に関する研究 Reviewed

    藤木三智成, 西山哲, 井上浩一, 堀川毅信, 大石哲, 鳥田英司, 阿部亮吾, 徳岡杜香

    地盤と建設   34 ( 1 )   109‐117   2016.12

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  • A STUDY ON DIGITAL PHOTOGRAMMETRY FOR MONITORING INFRASTRUCTURES Reviewed

    HIROTA Akihisa, NISHIYAMA Satoshi, KIKUCHI Teruyuki

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics)   72 ( 2 )   I_103 - I_111   2016

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    &nbsp;This paper presents a study on monitoring method of crack width on concrete structures using digital photogrammetry. In this measurement procedure, the reflective targets are installed at measurement points around the crack as the gauges, and the deformation of crack width is calculated from one image taken from arbitrary camera positions. In this paper, we verify the relation between the accuracy/precision and the distance/angle of photographic positions from the targets in experiments, and the results showed that it was possible to measure the displacement of crack about 0.1mm at 100m and 30 degree photographic angle. Moreover, application of this method to measuring crack changes on actual concrete structures showed that it was possible to monitoring of the structures easily by using this method.

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  • MEASUREMENT OF CRACK WIDTH USING DIGITAL PHOTOGRAMMETRY FOR EVALUATION OF THE STABILITY OF TUNNEL Reviewed

    HIROTA Akihisa, NISHIYAMA Satoshi, MIZUGUCHI Takashi, ISHIMURA Katsunobu

    Journal of Japan Society of Civil Engineers, Ser. F1 (Tunnel Engineering)   72 ( 3 )   I_87 - I_95   2016

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    &nbsp;The objective of the study is to measure the displacement of the crack by using a digital camera image. In this measurement technique proposed here, the reflective targets are installed at the measurement point around the crack as gauges and the digital image of reflective targets is subjected to process which consists of image processing and photogrammetry, and the two dimensional displacement of the crack is calculated based on the coordinates of reflective targets. In this paper, experiments were performed to verify the accuracy and precision of the measurement. This paper also showed the actual tunnel measurement results to demonstrate that the cracks on the tunnel wall by using this method.

    DOI: 10.2208/jscejte.72.I_87

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  • A METHOD OF DETERMINING PRIORITIES FOR INVESTMENT IN DISASTER PREVENTION FOR ROCKFALL FROM SLOPES Reviewed

    KOHMA Taichi, SUGIYAMA Tomoyasu, NUNOKAWA Osamu, NISHIGAKI Makoto, NISHIYAMA Satoshi, OSHIMA Yoshinobu

    Journal of Japan Society of Civil Engineers, Ser. F4 (Construction and Management)   72 ( 1 )   31 - 46   2016

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    &nbsp;To effectively mitigate the rockfalls from the slopes neighboring railway lines, the risk of individual rock should be quantified with consideration of its stability and damage cost, and then the risk-based counter action should be done. However, assessing all the rocks in all the slopes along with the lines is quite difficult due to the restriction of budget and human resources. Therefore, in this study, two-step risk assessment was proposed: first, the target lines to be assessed were preliminarily selected according to the expected number of rockfalls which can be calculated by previous data. Then the risk of individual rockfall in the target lines was calculated by multiplying the damage cost and the collision probability between the rock and train. Finally, optimum counter action was determined according to the risk reducing effect or its benefit by cost.

    DOI: 10.2208/jscejcm.72.31

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  • Improved digital photogrammetry technique for crack monitoring

    Satoshi Nishiyama, Nao Minakata, Teruyuki Kikuchi, Takao Yano

    Advanced Engineering Informatics   29 ( 4 )   851 - 858   2015.10

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    Inspections to evaluate the safety, durability, and service life of aging infrastructure play an important role in determining the countermeasures that need to be taken, such as reinforcement, repair, and reconstruction. In infrastructure containing concrete, such as bridges and tunnels, crack widths and patterns on surfaces are two of the most important signs used to estimate durability. Current conventional techniques used for this purpose suffer from challenges such as tediousness, subjectivity, and high cost. Consequently, a new measurement technique that overcomes these challenges while measuring crack displacement with high accuracy and precision in aging civil engineering structures is needed. In this paper, we proposed a technique for measuring crack displacement using a digital camera image. In the proposed technique, reflective targets are established around both sides of a crack as gauges, and subsequent digital camera images of the targets are subjected to image processing to determine the displacements of the targets. These displacements can be measured using images captured from any arbitrary camera position. The results of experiments conducted to verify the efficacy of the proposed method show that crack displacements of less than 0.10 mm can be measured with high accuracy and precision using digital images captured at a distance of 10.0 m from the target, while less than 0.20 mm changes in the tensile displacement of the crack can be measured from an image captured at 25.0 m from the crack. Measurement results obtained from a tunnel are also presented to show that cracks in the walls of an actual tunnel can be identified through simple measurements. These measurements, taken over a period of one year, indicate that the tendency of crack displacement and slide movements are in close agreement.

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  • The application of Mobile Mapping System to river embankment measurement Reviewed

    橘菊生, 間野耕司, 島村秀樹, 西山哲

    写真測量とリモートセンシング   54 ( 4 )   166 - 177   2015.9

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  • 河川堤防計測のための高所設置型MMSの開発と精度検証 Reviewed

    橘菊生, 間野耕司, 島村秀樹, 西山哲

    応用測量論文集   26   75 - 86   2015.6

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  • RESEARCH OF MAINTENANCE OF ROAD TUNNEL BY MIMM Reviewed

    MIZUGUCHI Takashi, OHNISHI Yuzo, NISHIYAMA Satoshi, NISHIKAWA Keiichi, SHIMOZAWA Masamichi, ISHIMURA Katsunobu

    Journal of Japan Society of Civil Engineers, Ser. F2 (Underground Space Research)   71 ( 1 )   20 - 30   2015

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    &nbsp;A catastrophic accident involving road users occurred at Sasago tunnel built in Yamanashi prefecture in December 2012. In Japan, many infrastructures have been constructed have contributed to economic growth, but recently one of the most challenging issues is to know whether these old infrastructures are safe or not, and the inspection to evaluate their soundness will play an important role. Considering these situations, this study proposes a new mobile inspection method using a vehicle with laser scanners and image photographing units as a robot technique introduced to the inspection work. In this paper, the authors discuss the latest management criteria and problems about maintenance for road tunnel, and consider the feasibility of our proposed inspection method. We present the importance of maintenance work by utilizing the robot technique to make maintenance work more efficient, more accurate and safer.

    DOI: 10.2208/jscejusr.71.20

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  • Improved digital photogrammetry technique for crack monitoring.

    Satoshi Nishiyama, Nao Minakata, Teruyuki Kikuchi, Takao Yano

    Advanced Engineering Informatics   29 ( 4 )   851 - 858   2015

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  • MEMS型三軸傾斜計による法面崩壊の計測事例 Reviewed

    中村公一, 島内哲哉, 小野和行, 西山哲

    地盤と建設   32 ( 1 )   131 - 136   2014.12

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  • Mechanical and hydraulic behavior of a rock fracture under shear deformation Reviewed

    Satoshi Nishiyama, Yuzo Ohnishi, Hisao Ito, Takao Yano

    EARTH PLANETS AND SPACE   66   2014.9

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    With regard to crystalline rock that constitutes deep geology, attempts have been made to explore its hydraulic characteristics by focusing on the network of numerous fractures within. As the hydraulic characteristics of a rock are the accumulation of hydraulic characteristics of each fracture, it is necessary to develop the hydraulic model of a single fracture to predict the large-scale hydraulic behavior. To this end, a simultaneous permeability and shear test device is developed, and shear-flow coupling tests are conducted on specimens having fractures with varied levels of surface roughness in the constant normal stiffness conditions. The results show that the permeability characteristics in the relation between shear displacement and transmissivity change greatly at the point where the stress path reaches the Mohr-Coulomb failure curve. It is also found that there exists a range in which transmissivity is not proportional to the cube of mechanical aperture width, which seems to be because of the occurrence of channeling phenomenon at small mechanical aperture widths. This channeling flow disappears with increasing shear and is transformed into a uniform flow. We develop a simulation technique to evaluate the macroscopic permeability characteristics by the lattice gas cellular automaton method, considering the microstructure of fracture, namely the fracture surface roughness. With this technique, it is shown that the formation of the Hagen-Poiseuille flow is affected by the fracture microstructure under shear, which as a result determines the relationship between the mechanical aperture width and transmissivity.

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  • 交通事故低減機能が期待された環境改善舗装の長期機能保持に関する考察 Reviewed

    西山哲, 和田實, 辻森和美, 有賀公則

    交通科学   44 ( 2 )   4 - 10   2014.3

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  • Application of Three-dimensional Photogrammetry to Slope Monitoring Reviewed

    菊地輝行, 秦野輝儀, 西山哲

    応用地質   54 ( 6 )   264 - 271   2014.2

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    This paper deals with the development of a three-dimensional slope behavior monitoring method using digital photogrammetry with only simple measurement work. We report its feasibility based on the results of experimental application of the proposed system to actual slope monitoring. In the paper, an appropriate measurement system for slope behavior monitoring was established by applying the following two techniques to the existing photogrammetric technique : one technique for simply obtaining the two-dimensional distribution of displacements with accuracy of 5mm without having to set fiducial points on the slope; and the other technique for obtaining the three-dimensional distribution of coordinate values of measurement points from the geometric constraint conditions of the geodetic network. This paper presents the theoretical development of this new measurement system and actual extensive slope measurement results. The theoretical development shows that slope behavior can be identified through simple measurements. The measurement results demonstrate that the measurements conducted by the proposed system are consistent with the measurement results using conventional extensometers and survey instruments.

    DOI: 10.5110/jjseg.54.264

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  • モービルマッピングシステムによる河川堤防の高精度計測 Reviewed

    東良慶, 西山哲, 石川貴一朗, 吉岡裕嗣, 島村秀樹, 大浪裕之

    河川技術論文集   20   485‐490   2014

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  • Study on the Relation between Pore Fluid Behavior and Longiudinal Wave Dispersion Reviewed

    西山哲, 佐野修, 伊藤久男, 高橋学

    地学雑誌   122 ( 1 )   170 - 191   2013.2

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  • STUDY ON FLOOD CONTROL PROPERTIES OF PERMEABLE PAVEMENT USING SATURATED-UNSATURATED SEEPAGE ANALYSIS Reviewed

    矢野 隆夫, 西山 哲, 大西 有三, 中島 伸一郎, 森石 一志, 和田 實

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)   68 ( 1 )   32 - 44   2012

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    &amp;nbsp;The rainfall storage and infiltration facility of permeable pavement have been attracted attention as a control measure of flood and an environmental improvement measure in urban areas. However, rainfall infiltration of permeable pavement is unsteady flow and strongly dependent on the behavior of unsaturated zones in the pavement. Moreover, the wet condition of subbase course also has a great influence on the rainfall infiltration of the pavement. That&#039;s why previous studies have not made clear the precise the facility of permeable pavement as a flood control. In this paper, experimental studies and simulated analyses were performed to measure the overflow from the pavement under various conditions of rainfall intensities and estimate the rainfall infiltration of the pavement using the measurement data and unsaturated infiltration characteristics of porous asphalt materials. It is clear that this study shows the methods to have a quantitative estimation of the rainfall storage and infiltration facility of permeable pavement.

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  • Study on Dispersion of Longitudinal Elastic Waves in Porous Media Reviewed

    NISHIYAMA Satoshi, YANO Takao, OHNISHI Yuzo

    Journal of the Society of Materials Science, Japan   61 ( 3 )   222 - 227   2012

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    Survey methods using elastic wave velocity have been performed in order to estimate the pore fluid properties in rock mass, but the viscosity and density of pore fluid have not been estimated quantitatively by the values of velocity or the velocity changes. We describe in this paper whether pore fluid properties can be estimated by using the dispersion of longitudinal elastic waves. We measured the frequency-dependent velocity data of longitudinal elastic waves in porous specimens and the dependence of the velocity dispersion on the kinematic viscosity of pore fluid. Moreover, we try to explain the velocity dispersion shown by the measurement data using the Biot theory. The Biot theory explains that the dispersion phenomenon is caused by the elastic property change in the media with the interaction between the solid phase and liquid phase, so the dispersion is dependent on the properties of liquid phase. The measurement data showed the phase velocities of longitudinal waves increased with an increase of frequencies and the characteristic frequencies which indicate the points of inflection moved to higher frequencies with an increase of kinematic viscosities of pore fluid. We report that we can estimate the kinematic viscosity of pore fluid in rock mass by using the dispersion curves which graphed the relation between the phase velocities and frequencies.

    DOI: 10.2472/jsms.61.222

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  • Study on dispersion of longitudinal elastic waves in porous media

    Satoshi Nishiyama, Takao Yano, Yuzo Ohnishi

    Zairyo/Journal of the Society of Materials Science, Japan   61 ( 3 )   222 - 227   2012

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    Survey methods using elastic wave velocity have been performed in order to estimate the pore fluid properties in rock mass, but the viscosity and density of pore fluid have not been estimated quantitatively by the values of velocity or the velocity changes. We describe in this paper whether pore fluid properties can be estimated by using the dispersion of longitudinal elastic waves. We measured the frequency-dependent velocity data of longitudinal elastic waves in porous specimens and the dependence of the velocity dispersion on the kinematic viscosity of pore fluid. Moreover, we try to explain the velocity dispersion shown by the measurement data using the Biot theory. The Biot theory explains that the dispersion phenomenon is caused by the elastic property change in the media with the interaction between the solid phase and liquid phase, so the dispersion is dependent on the properties of liquid phase. The measurement data showed the phase velocities of longitudinal waves increased with an increase of frequencies and the characteristic frequencies which indicate the points of inflection moved to higher frequencies with an increase of kinematic viscosities of pore fluid. We report that we can estimate the kinematic viscosity of pore fluid in rock mass by using the dispersion curves which graphed the relation between the phase velocities and frequencies. © 2012 The Society of Materials Science, Japan.

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  • DDA simulations for slope failure/collapse experiment caused by torrential rainfall Reviewed

    T. Koyama, K. Irie, K. Nagano, S. Nishiyama, N. Sakai, Y. Ohnishi

    Proceedings of the 10th International Conference on Advances in Discontinuous Numerical Methods and Applications in Geomechanics and Geoengineering, ICADD 10   119 - 126   2012

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    In this study, a series of large-scale slope failure experiments with torrential rainfall was carried out and simulated using Discontinuous Deformation Analysis (DDA). Since DDA have not been coupled with flow calculation at present, the rainwater infiltration and rising groundwater level inside the slope was simulated separately using saturated-unsaturated flow analysis by Finite Element Method (FEM). The flow simulation results by FEM were incorporated in the DDA mechanical simulation as reduction of the shear strength and increase of the self weight. In the 2-D DDA model, octagonal blocks of 11.8 cm on average were used and rainfall boundary condition (steady rainfall of 100 mm/hour) was applied to the ground surface. The DDA simulation results were compared with the ones obtained from the rainfall experiments and the applicability of DDA to the slope failure/ collapse caused by torrential rainfall was also discussed. The simulation results also show that groundwater plays important roles for the failure process of soil mass, especially rainwater infiltration mechanism was significantly affected by unsaturated soil properties. © 2012 Taylor & Francis Group, London.

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  • STABILITY ANALYSES FOR ANCIENT MASONRY STRUCTURES USING DISCONTINUOUS DEFORMATION ANALYSIS AND NUMERICAL MANIFOLD METHOD Reviewed

    Takeshi Sasaki, Ikuo Hagiwara, Kastuji Sasaki, Ryunoshin Yoshinaka, Yuzo Ohnishi, Satishi Nishiyama, Tomofumi Koyama

    INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS   8 ( 2 )   247 - 275   2011.6

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    In this paper, the stability including stress distribution of two ancient masonry structures, the pyramid of the Pharaoh Khufu, Egypt and the Pont of Gard, were analyzed using discontinuous deformation analysis (DDA) and numerical manifold method (NMM). For the simulation using NMM, the newly developed four-node isoparametric element was used. The stress distributions/concentration were calculated and compared between the two methods. The calculated results show qualitative agreement with observations. DDA and NMM are applicable to simulate the physical phenomena of masonry structures.

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  • Real-time slope water table forecasting by multi-tank model combined with dual ensemble Kalman filter (Retracted article. See vol. 9, pg. 303, 2012) Reviewed

    Jun Xiong, Tomofumi Koyama, Satoshi Nisiyama, Yuzo Ohnishi, Kenji Takahashi

    LANDSLIDES   8 ( 1 )   81 - 89   2011.3

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    The multi-tank model is a helpful tool for rainfall-groundwater-runoff analysis since it can represent a nonlinear transport behavior and give predictions very quickly. On one hand, because of its simple and quick calculation, the tank model is useful in water table or stream flow prediction; on the other hand, by reason of its simplicity, its model error is relatively big, the model adjustment through the time variation is necessary. A new data assimilation methodology for online tuning of model parameters and states in the multi-tank model by taking into account new observations was developed, and important model parameters and states are retrieved simultaneously based on dual ensemble Kalman filter. A description of applying multi-tank model to simulate rainfall infiltration process in the slope is presented, and also the implementation of the dual ensemble Kalman filter approach for slope water table forecasting is demonstrated. Based on the observation data, the performance of the new method is studied. Finally, the factor of slope stability could be predicted based on filtered water tables. In this way, an early warning system of slope stability during rainfall could be built, which is helpful for disaster prevention.

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  • Modeling the interaction between fluid flow and particle movement with discontinuous deformation analysis (DDA) method Reviewed

    Tomofumi Koyama, Satoshi Nishiyama, Meng Yang, Yuzo Ohnishi

    INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS   35 ( 1 )   1 - 20   2011.1

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    Coupled hydro-mechanical processes in granular media represent the interaction between solid particles movement and fluid flow during external and/or internal loading. The processes attract attention in geotechnical engineering since they cause many disasters such as landslide, slope collapse, boiling/quicksand and soil liquefaction, etc. This study presents a numerical method combining discontinuous deformation analysis (DDA) for mechanical calculation and finite element method for fluid flow simulation to model the interaction between solid particles' movement and fluid flow from microscopic point of view. The term of hydraulic pressure was newly formulated and introduced to the original DDA. The simplified examples are given to verify the new method, and the computational results correlate well with the theoretical calculations, further development is also considered. Copyright (C) 2010 John Wiley & Sons, Ltd.

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  • SATURATED - UNSATURATED HYDRAULIC PROPERTIES OF SUBBASE COURSE MATERIAL AND SUBGRADE SOIL Reviewed

    YANO Takao, NISHIYAMA Satoshi, NAKASHIMA Shin-ichiro, MORIISHI Kazushi, OHNISHI Yuzo

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)   67 ( 2 )   120 - 130   2011

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    &nbsp;In order to evaluate the rainwate r storage and infiltration properties of the permeable pavement by unsaturated seepage analysis or gas-liquid two-phase flow analysis, it is important to know the unsaturated hydraulic properties of materials wh ich constitute the pavement. For this reason, we showed the unsaturated hydraulic properties of porous asphalt material s but we have not clarified the relation between the performance of the permeable pavement and the properties of all constituti on materials. In this paper, we try to determine the unsaturated hydraulic properties of subbase course and subgrade materials that greatly affect the rainwater storage and infiltration properties of the permeable pavement. We show from experiments that water retention characteristic and the un saturated hydraulic properties of subbase course and subgrade materials well match the van Genuchten model and the Irmay model.

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  • STUDY ON DISPERSION OF LONGITUDINAL ELASTIC WAVES IN ROCK SPECIMENS Reviewed

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, TAKAHASHI Manabu, YOSHIMURA Kimitaka, ANDO Ken-ichi

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)   67 ( 2 )   288 - 298   2011

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    &nbsp;In order to estimate the permeable properties and pore fluid properties in the ground, survey methods using dispersion and attenuation of elastic waves have been developed. The Biot theory have been applied to the frequency-dependent dispersion data, but the influence of geological properties on velocity dispersion and the relation between the permeable properties and velocity dispersion in rock specimens have not become clear. Sedimentary rock and granite specimens were tested using longitudinal waves for the difference of velocity dispersion phenomena observed in each specimen, and we examine whether the Biot theory can be applied to observed experimental data. Moreover, we tried to estimate the permeability of the rock specimen based on the theory and show that the Biot-squirt theory can be applied to estimating rock permeability using the seismic wave dispersion characteristics.

    DOI: 10.2208/jscejge.67.288

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  • Study on a measurement method of slope displacement using a radio unit Reviewed

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, SATO Masaru, YOSHIZAKI Wataru

    Japanese Geotechnical Journal   6 ( 4 )   503 - 511   2011

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    This paper describes the method that measures displacements from the three dimensional coordinate of the radio wave transmitter attached on the slope by the phase differences of received signals that were received by the receivers in the slope surroundings. Concretely, the special low power radio wave emitted by the transmitter on the slope was received by four or more receivers, and then the transmitter coordinates were calculated by an intersection of iso-phase-difference surfaces of each received signal. In the study, we consider the calculation method of the transmitters&rsquo; coordinate values and prove by the experiments that we can in real time measure the slope displacement with a high degree of accuracy by using devices with the radio wave of the frequency of 2.4GHz. We show that we can estimate the precision using GDOP that is determined by geometrical arrangement of the transmitters and receivers and verify the applicability of the proposed method in a real slope.

    DOI: 10.3208/jgs.6.503

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  • RAINWATER OUTFLOW SUPPRESSION EFFECT OF THE PAVEMENT FOR LANDSCAPE HAVING PERMEABILITY Reviewed

    MORIISHI Kazushi, NISHIYAMA Satoshi, YANO Takao, KOSEKI Hiroji, OHNISHI Yuzo

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)   67 ( 3 )   I_155 - I_163   2011

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    &nbsp;In order to evaluate runoff control proper ties of three types of permeable pavements, namely, porous asphalt pavement, permeable interlocking concrete pavement and water-holding interlocking concrete pavement, experimentally obtaining permeability and water retentivity of each pavement material, this study conducted rainfall-runoff simulation of the three pavements using UNSA-2D, an numerical analysis program of saturated-unsaturated seepage flow. The input parameters of the numerical simulation were determined by fitting van Genuchten (VG) model or Irmay model into the experimental results. The simulation was performed under constant rainfall condition of three rainfall intensities and varying rainfall condition of center-peaked pattern. The results of numerical simulation revealed runoff characteristics of the three pavements, such as the temporal change in storage and infiltration with time, the runoff beginning time depending on the rainfall intensity and so on.

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  • Study on application of digital image measurement method to monitoring system for tunnel construction management Reviewed

    Satoshi Nishiyama, Yuzo Ohnishi, Ryu Meiji, Takumi Nakai

    Zairyo/Journal of the Society of Materials Science, Japan   59 ( 3 )   186 - 191   2010.3

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    This paper introduces a new measurement system using digital images for tunnel construction management This measurement technique that utilizes digital images brings the following benefits compared with conventional techniques. The 3-dimensional deformations and the area-wide distributions of many measurement points can be obtained through simple measurement work. As the image data are all in digital format, real-time monitoring is possible. Measurement involves photographing from a distance only, eliminating the need for sophisticated techniques to improve accuracy as in conventional measurement The necessary measurement hardware consists of a digital camera and a PC only, which brings down measurement cost This study first attempts to establish the theoretical framework for using images photographed from any position with a digital camera for measuring any object for which is difficult to set fiducial points, such as a tunnel and reproduce the 3-dimensional displacement of a tunnel with considerable decision. It then goes on to clarify the relation between various measurement parameters and measurement decision and includes experiments to evaluate the performance of the technique that is applied to deformation measurement system of jointed rock masses. As a result the establishment of a new measurement system featuring simple measurement work and a high degree of decision was found to be possible. © 2010 The Society of Materials Science, Japan.

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  • A STUDY ON THE CHARACTERISTICS OF NUMERICAL DAMPING IN DISCONTINUOUS DEFORMATION ANALYSIS (DDA) Reviewed

    KOYAMA Tomofumi, FUKAWA Tetsuya, NISHIYAMA Satoshi, OHNISHI Yuzo

    Doboku Gakkai Ronbunshuu C   66 ( 2 )   299 - 311   2010

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    &amp;nbsp;&amp;nbsp;In the DDA, the contact spring are introduced between the blocks contacting each other to prevent the penetration of the blocks but the dashpots are not usually introduced unlike DEM. However, it is well known that the numerical damping caused by numerical integration occurs during the simulations. In this study, the characteristics of numerical damping caused by Newmark &amp;beta; method in DDA was investigated using simple 1-D free oscillation problem. The 1-D collision problem was analysied using DDA with 3-D rigid sphere block and sensitivity analysis for the parameters related to Newmark &amp;beta; method was carried out. The effect of these parameters on the numerical stability and accuracy was also discussed. From the analytical results, in DDA, the calculation time step, &amp;Delta;&lt;i&gt;t&lt;/i&gt; and natural frequency, &lt;i&gt;T&lt;/i&gt; should satisfy the condition of &amp;Delta;&lt;i&gt;t/T&lt;/i&gt;&lt;0.05 to obtain the results with good accuracy. To evaluate the energy loss correctly when the two blocks collide each other, the effect of numerical damping and velocity ratio should be considered separately.

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  • SATURATED-UNSATURATED HYDRAULIC PROPERTIES OF POROUS ASPHALT MIXTURE Reviewed

    YANO Takao, NISHIYAMA Satoshi, NAKASHIMA Shinichiro, MORIISHI Kazushi, OHNISHI Yuzo

    Doboku Gakkai Ronbunshuu E   66 ( 4 )   452 - 465   2010

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    &amp;nbsp;&amp;nbsp;A permeable pavement, which is one of pavements with various advanced functions, has been expected to improve the urban environments by the pervious surface structures. Because we need to determine the water retention and permeability characteristics of pavement materials in order to evaluate the rainfall storage and infiltration facilities of the permeable pavement, we conducted a series of laboratory tests using porous asphalt mixture specimens having a diameter of 150mm which consist of several different kinds of maximum grain size, void ratio and specimen length. The experimental results show that the Van Genuchten model predicts the water retention curves and the Irmay model predicts the unsaturated permeability coefficients of such materials very well, respectively.

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  • SATURATED-UNSATURATED HYDRAULIC PROPERTIES OF POROUS ASPHALT MIXTURE Reviewed

    YANO Takao, NISHIYAMA Satoshi, NAKASHIMA Shinichiro, MORIISHI Kazushi, OHNISHI Yuzo

    Doboku Gakkai Ronbunshuu E   66 ( 4 )   452 - 465   2010

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    &nbsp;&nbsp;A permeable pavement, which is one of pavements with various advanced functions, has been expected to improve the urban environments by the pervious surface structures. Because we need to determine the water retention and permeability characteristics of pavement materials in order to evaluate the rainfall storage and infiltration facilities of the permeable pavement, we conducted a series of laboratory tests using porous asphalt mixture specimens having a diameter of 150mm which consist of several different kinds of maximum grain size, void ratio and specimen length. The experimental results show that the Van Genuchten model predicts the water retention curves and the Irmay model predicts the unsaturated permeability coefficients of such materials very well, respectively.

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  • A STUDY ON THE CHARACTERISTICS OF NUMERICAL DAMPING IN DISCONTINUOUS DEFORMATION ANALYSIS (DDA) Reviewed

    KOYAMA Tomofumi, FUKAWA Tetsuya, NISHIYAMA Satoshi, OHNISHI Yuzo

    Doboku Gakkai Ronbunshuu C   66 ( 2 )   299 - 311   2010

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    &nbsp;&nbsp;In the DDA, the contact spring are introduced between the blocks contacting each other to prevent the penetration of the blocks but the dashpots are not usually introduced unlike DEM. However, it is well known that the numerical damping caused by numerical integration occurs during the simulations. In this study, the characteristics of numerical damping caused by Newmark &beta; method in DDA was investigated using simple 1-D free oscillation problem. The 1-D collision problem was analysied using DDA with 3-D rigid sphere block and sensitivity analysis for the parameters related to Newmark &beta; method was carried out. The effect of these parameters on the numerical stability and accuracy was also discussed. From the analytical results, in DDA, the calculation time step, &Delta;t and natural frequency, T should satisfy the condition of &Delta;t/T<0.05 to obtain the results with good accuracy. To evaluate the energy loss correctly when the two blocks collide each other, the effect of numerical damping and velocity ratio should be considered separately.

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  • Experimental study on imaging hydraulic conductivity of rock masses based on elastic wave velocity dispersion Reviewed

    YOSHIMURA Kimitaka, ANDO Ken-ichi, SAKASHITA Susumu, BRUINES Patrick, OKUMURA Hirohumi, NISHIYAMA Satoshi, OHNISHI Yuzo

    BUTSURI-TANSA(Geophysical Exploration)   62 ( 3 )   307 - 318   2009.6

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    &emsp;The objective of this study is to establish a technique to obtain hydraulic conductivity distribution in granite rock masses. This technique is based on the characteristic that elastic wave velocity disperses in fully saturated porous media on frequency. Velocity dispersion is governed by fluid/solid interaction which corresponds to the hydraulic conductivity such as described by Biot and BISQ theory.<br> &emsp;In order to verify the validity of these theories in granite rock, laboratory tests were performed. The results of experiments show that the elastic wave velocity dispersion for granite rock can be well described by BISQ theory. To test the applicability of this approach in real rock masses, we performed in-situ experiments at the Grimsel test site in Switzerland. Dispersion phenomena were detected in the frequency range from 0.8 kHz to 80 kHz, in the borehole distance range from 1.5m to 70m. Cross-hole tomography measurements, with frequency at 20 kHz and 40 kHz in a distance between boreholes of 1.5 meter, were carried out.<br> &emsp;To obtain the hydraulic conductivity image, geostatistical technique was tried. A limited number of hydraulic test data were used to find the correlation between the velocity difference and hydraulic conductivity. With this correlation, a hydraulic conductivity image was constructed. The location of the high hydraulic conductivity zone from the result agrees with that estimated using geological information. Additional hydraulic tests were conducted in a borehole located in the middle of the tomography plane. These hydraulic tests show a good agreement between the measured hydraulic conductivity and the hydraulic conductivities predicted from the cross-hole tomography.<br> &emsp;These result of experimental studies show that the possibility as a practical method to determine the hydraulic conductivity image in granite rock.<br>

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  • Experimental study on imaging hydraulic conductivity of rock masses based on elastic wave velocity dispersion Reviewed

    YOSHIMURA Kimitaka, ANDO Ken-ichi, SAKASHITA Susumu, BRUINES Patrick, OKUMURA Hirohumi, NISHIYAMA Satoshi, OHNISHI Yuzo

    BUTSURI-TANSA(Geophysical Exploration)   62 ( 3 )   307 - 318   2009.6

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    &amp;emsp;The objective of this study is to establish a technique to obtain hydraulic conductivity distribution in granite rock masses. This technique is based on the characteristic that elastic wave velocity disperses in fully saturated porous media on frequency. Velocity dispersion is governed by fluid/solid interaction which corresponds to the hydraulic conductivity such as described by Biot and BISQ theory.&lt;br&gt; &amp;emsp;In order to verify the validity of these theories in granite rock, laboratory tests were performed. The results of experiments show that the elastic wave velocity dispersion for granite rock can be well described by BISQ theory. To test the applicability of this approach in real rock masses, we performed in-situ experiments at the Grimsel test site in Switzerland. Dispersion phenomena were detected in the frequency range from 0.8 kHz to 80 kHz, in the borehole distance range from 1.5m to 70m. Cross-hole tomography measurements, with frequency at 20 kHz and 40 kHz in a distance between boreholes of 1.5 meter, were carried out.&lt;br&gt; &amp;emsp;To obtain the hydraulic conductivity image, geostatistical technique was tried. A limited number of hydraulic test data were used to find the correlation between the velocity difference and hydraulic conductivity. With this correlation, a hydraulic conductivity image was constructed. The location of the high hydraulic conductivity zone from the result agrees with that estimated using geological information. Additional hydraulic tests were conducted in a borehole located in the middle of the tomography plane. These hydraulic tests show a good agreement between the measured hydraulic conductivity and the hydraulic conductivities predicted from the cross-hole tomography.&lt;br&gt; &amp;emsp;These result of experimental studies show that the possibility as a practical method to determine the hydraulic conductivity image in granite rock.&lt;br&gt;

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  • EARTHQUAKE RESPONSE ANALYSIS FOR ROCK SLOPE USING DISCONTINUOUS DEFORMATION ANALYSIS (DDA)

    KOYAMA Tomofumi, AKAO Satoshi, NISHIYAMA Satoshi, OHNISHI Yuzo

    Doboku Gakkai Ronbunshuu C   65 ( 3 )   644 - 662   2009

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    &amp;nbsp;&amp;nbsp;To investigate the discontinuous behaviors of rock slopes/masses after collapse of the rock slope caused by the earthquake, the discontinuum based approach is necessary. In this study, the earthquake response analysis for discontinuous blocks was performed by Discontinuous Deformation Analysis (DDA) with a single block and multilayer block models. The results obtained from the simulations by DDA were compared with the analytical solutions and results from the laboratory shaking table tests. We investigated the applicability of DDA to seismic problems. It was found that DDA is powerful tool to analyze seismic response for both simple block and multilayer block models.

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  • STUDY ON FUNDAMENTAL CHARACTERISTICS OF VELOCITY- RATIO USED IN ROCKFALL SIMULATION AND ITS APPLICATION TO DDA

    SHIMAUCHI Tetsuya, OHNISHI Yuzo, NISHIYAMA Satoshi, NAKAMURA Koichi, SAKAI Naoki

    Doboku Gakkai Ronbunshuu C   65 ( 1 )   53 - 65   2009

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    In the DDA (Discontinuous Deformation Analysis), the ratio of velocity energies (squared velocity ratio) is used for the energy loss during collision. The velocity ratio is investigated in detail with the experiments. It was clear that the velocity ratio is dependent on the incident velocity of the normal direction. Therefore, velocity ratio is not appropriate to consider the property as a direct input value of the simulation. However, we have clarified that it is possible to perform a rockfall simulation by considering the velocity-dependence of the velocity ratio in the application of DDA by using the &amp;ldquo;Scale Factor&amp;rdquo; as proposed by Pfeiffer et al. (1989).

    DOI: 10.2208/jscejc.65.53

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  • A study of the index of rock shape in the rock fall simulation, using discontinuous deformation analysis

    HAGIWARA Ikuo, OHNISHI Yuzo, SASAKI Takeshi, NISHIYAMA Satoshi

    Japanese Geotechnical Journal   4 ( 4 )   357 - 367   2009

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    We study the numerical index of rock shape in order to improve the procedure for the determination of geometric parameters in the rock fall simulation using discontinuous deformation analysis. Aspect ratio, roundness and shape entropy are examined as the index of rock shape characteristics through the simulation of simple-bouncing case, multiple-bouncing case and actual rock fall failure case. Results of these simulations indicate that roundness and shape entropy of curvature are the practical index corresponding to the behavior of falling block in the simulation, i.e., variation of exit angle in single-bouncing process and energy loss in multiple-bouncing process. It is thought that applying these indexes to the rock fall simulation is effective for reducing subjective error in recognizing characteristics of rock shape and improving accuracy of the rock fall simulation.

    DOI: 10.3208/jgs.4.357

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  • STUDY ON PERMEABILITY CHARACTERISTICS OF ROCK DISCONTINUITIES UNDER SHEAR DEFORMATION USING LATTICE-GAS AUTOMATON METHOD

    NISHIYAMA Satoshi, OHNISHI Yuzo, SAWADA Atsushi, YANO Takao

    Doboku Gakkai Ronbunshuu C   65 ( 4 )   776 - 788   2009

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    &nbsp;&nbsp;This paper describes the simulation method to explain the mechanism of the permeability characteristics of specimens with single discontinuties under shear through shear-flow coupling tests, showing that on the shear stress-displacement curve obtained by the constant normal load testing, the water flowing through the discontinuties have different transmissibility-aperture width relation before or after the yield range. As a technique to serve this purpose, the lattice gas automaton method, which is to substitute the fluid with particles and repeat letting them collide. With this technique, the factors of surface structure of discontinuties that determine the shear/permeability characteristics are identified.

    DOI: 10.2208/jscejc.65.776

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  • EARTHQUAKE RESPONSE ANALYSIS FOR ROCK SLOPE USING DISCONTINUOUS DEFORMATION ANALYSIS (DDA)

    KOYAMA Tomofumi, AKAO Satoshi, NISHIYAMA Satoshi, OHNISHI Yuzo

    Doboku Gakkai Ronbunshuu C   65 ( 3 )   644 - 662   2009

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    &nbsp;&nbsp;To investigate the discontinuous behaviors of rock slopes/masses after collapse of the rock slope caused by the earthquake, the discontinuum based approach is necessary. In this study, the earthquake response analysis for discontinuous blocks was performed by Discontinuous Deformation Analysis (DDA) with a single block and multilayer block models. The results obtained from the simulations by DDA were compared with the analytical solutions and results from the laboratory shaking table tests. We investigated the applicability of DDA to seismic problems. It was found that DDA is powerful tool to analyze seismic response for both simple block and multilayer block models.

    DOI: 10.2208/jscejc.65.644

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  • STUDY ON PERMEABILITY CHARACTERISTICS OF ROCK DISCONTINUITIES UNDER SHEAR DEFORMATION USING LATTICE-GAS AUTOMATON METHOD

    NISHIYAMA Satoshi, OHNISHI Yuzo, SAWADA Atsushi, YANO Takao

    Doboku Gakkai Ronbunshuu C   65 ( 4 )   776 - 788   2009

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    &amp;nbsp;&amp;nbsp;This paper describes the simulation method to explain the mechanism of the permeability characteristics of specimens with single discontinuties under shear through shear-flow coupling tests, showing that on the shear stress-displacement curve obtained by the constant normal load testing, the water flowing through the discontinuties have different transmissibility-aperture width relation before or after the yield range. As a technique to serve this purpose, the lattice gas automaton method, which is to substitute the fluid with particles and repeat letting them collide. With this technique, the factors of surface structure of discontinuties that determine the shear/permeability characteristics are identified.

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  • A study of the index of rock shape in the rock fall simulation, using discontinuous deformation analysis

    HAGIWARA Ikuo, OHNISHI Yuzo, SASAKI Takeshi, NISHIYAMA Satoshi

    Japanese Geotechnical Journal   4 ( 4 )   357 - 367   2009

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    We study the numerical index of rock shape in order to improve the procedure for the determination of geometric parameters in the rock fall simulation using discontinuous deformation analysis. Aspect ratio, roundness and shape entropy are examined as the index of rock shape characteristics through the simulation of simple-bouncing case, multiple-bouncing case and actual rock fall failure case. Results of these simulations indicate that roundness and shape entropy of curvature are the practical index corresponding to the behavior of falling block in the simulation, i.e., variation of exit angle in single-bouncing process and energy loss in multiple-bouncing process. It is thought that applying these indexes to the rock fall simulation is effective for reducing subjective error in recognizing characteristics of rock shape and improving accuracy of the rock fall simulation.

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  • STUDY ON THE DURABILITY OF A PERMEABLE PAVEMENT APPLIED TO A HEAVY TRAFFIC ROAD

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, YAMAMOTO Tsuyoshi, KAGAWA Yasunori

    Doboku Gakkai Ronbunshuu E   64 ( 1 )   276 - 284   2008

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    The permeable pavement was attracted as a method of a city environmental improvement. It was introduced to subsidence occurred by pumping ground water. Application on a heavy traffic road is also considered now in connection with a recent law about control runoff in urban area. However, problems which should be solved, such as the durability, remain to apply permeable pavements on the heavy traffic road. This paper is discussed about the durability of a permeable pavement etc. from the results of the follow-up survey over about 13 years of the national highway by which test construction of the permeable pavement was carried out in Japan on the heavy traffic road in 1993.

    DOI: 10.2208/jsceje.64.276

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  • A MEASUREMENT METHOD OF TUNNEL DEFORMATION USING DIGITAL PHOTOGRAMMETRY

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, RYU Meiji

    Doboku Gakkai Ronbunshuu C   64 ( 3 )   598 - 606   2008

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    This paper presents a tunnel deformation measurement technique by using digital images taken from a moving car. Because the three-dimensional coordinate of each target installed on tunnel wall can be calculated through photogrametric analysis, it is possible to obtain the positions of the pairs of targets whose distances represent the crown settlement and convergence. This paper summarized the results of experiments performed to verify measurement precision. As a result, the coordinate values of targets with a high degree of precison can be obtained from the geometric constraint conditions of the geodetic network without having to set any fiducial points. Based on this study, this paper argues the practicability of the proposed technique in the tunnel maintenance phase.

    DOI: 10.2208/jscejc.64.598

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  • A STUDY ON EVALUATED THE PERFORMANCE OF THE PERMEABLE PAVEMENT INCONSIDERATION OF THE UNSATURATED SEEPAGE CHARACTERISTICS

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, KOSEKI Hiroji

    JOURNAL OF PAVEMENT ENGINEERING, JSCE   ( 13 )   63 - 70   2008

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    The permeability design in the design method of a permeable pavement makes the trial calculation of the road metal and pavement thickness to be used so that the permeavility capability demanded according to an application part may be satisfied. It is determined as compared with the structure required in a structural design. Saturated hydraulic conductivity is estimating the permeable ability in that case. However, the rainfall initial permeates in the state where a inside of pavement is unsaturated. Then, this research measured the water retention characteristics of a permeable pavement.

    DOI: 10.2208/journalpe.13.63

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  • Study on the Effect of Permeable Pavement on Improvement of Heat Environment in Urban Area

    西山 哲, 大西 有三, 矢野 隆夫

    日本ヒートアイランド学会誌 = Heat Island Institute International annual issue   3   22 - 28   2008

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  • A STUDY ON EVALUATED THE PERFORMANCE OF THE PERMEABLE PAVEMENT INCONSIDERATION OF THE UNSATURATED SEEPAGE CHARACTERISTICS

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, KOSEKI Hiroji

    JOURNAL OF PAVEMENT ENGINEERING, JSCE   13   63 - 70   2008

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    The permeability design in the design method of a permeable pavement makes the trial calculation of the road metal and pavement thickness to be used so that the permeavility capability demanded according to an application part may be satisfied. It is determined as compared with the structure required in a structural design. Saturated hydraulic conductivity is estimating the permeable ability in that case. However, the rainfall initial permeates in the state where a inside of pavement is unsaturated. Then, this research measured the water retention characteristics of a permeable pavement.

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  • STUDY ON THE DURABILITY OF A PERMEABLE PAVEMENT APPLIED TO A HEAVY TRAFFIC ROAD

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, YAMAMOTO Tsuyoshi, KAGAWA Yasunori

    Doboku Gakkai Ronbunshuu E   64 ( 1 )   276 - 284   2008

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    The permeable pavement was attracted as a method of a city environmental improvement. It was introduced to subsidence occurred by pumping ground water. Application on a heavy traffic road is also considered now in connection with a recent law about control runoff in urban area. However, problems which should be solved, such as the durability, remain to apply permeable pavements on the heavy traffic road. This paper is discussed about the durability of a permeable pavement etc. from the results of the follow-up survey over about 13 years of the national highway by which test construction of the permeable pavement was carried out in Japan on the heavy traffic road in 1993.

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  • Study on application of digital vision metrology to slope monitoring system

    RYU Meiji, OHNISHI Yuzo, NISHIYAMA Satoshi, NAKAI Takumi

    Japanese Geotechnical Journal   3 ( 2 )   109 - 119   2008

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    We have been studying the slope monitoring method using digital vision metrology. This study developed a technique for measuring the deformation of a slope using this measurement without setting any fiducial points and with the method of simply obtaining initial approximations of coordinate values from the images taken. This measurement method has the advantage of obtaining the three coordinates of many measurement points at cheap cost. In this paper, the precision of the measurement values obtained by the proposed technology is verified in the actual rock slope and we discuss its feasibility based on the experimental results of application of the measurement values to the design of countermeasure construction.

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  • Study on the Effect of Permeable Pavement on Improvement of Heat Environment in Urban Area Reviewed

    3   22 - 28   2008

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  • Study on application of digital vision metrology to slope monitoring system

    RYU Meiji, OHNISHI Yuzo, NISHIYAMA Satoshi, NAKAI Takumi

    Japanese Geotechnical Journal   3 ( 2 )   109 - 119   2008

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    We have been studying the slope monitoring method using digital vision metrology. This study developed a technique for measuring the deformation of a slope using this measurement without setting any fiducial points and with the method of simply obtaining initial approximations of coordinate values from the images taken. This measurement method has the advantage of obtaining the three coordinates of many measurement points at cheap cost. In this paper, the precision of the measurement values obtained by the proposed technology is verified in the actual rock slope and we discuss its feasibility based on the experimental results of application of the measurement values to the design of countermeasure construction.

    DOI: 10.3208/jgs.3.109

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  • A MEASUREMENT METHOD OF TUNNEL DEFORMATION USING DIGITAL PHOTOGRAMMETRY

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, RYU Meiji

    Doboku Gakkai Ronbunshuu C   64 ( 3 )   598 - 606   2008

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    This paper presents a tunnel deformation measurement technique by using digital images taken from a moving car. Because the three-dimensional coordinate of each target installed on tunnel wall can be calculated through photogrametric analysis, it is possible to obtain the positions of the pairs of targets whose distances represent the crown settlement and convergence. This paper summarized the results of experiments performed to verify measurement precision. As a result, the coordinate values of targets with a high degree of precison can be obtained from the geometric constraint conditions of the geodetic network without having to set any fiducial points. Based on this study, this paper argues the practicability of the proposed technique in the tunnel maintenance phase.

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  • Application of DDA to evaluate the mechanism of rock slope instability/rock fall

    Ma Guichen, Atsushi Yashima, Satoshi Nishiyama, Yuzo Ohnishi, Keiichi Monma, Hiroyuki Matsuyama

    3RD INTERNATIONAL SYMPOSIUM ON MODERN MINING & SAFETY TECHNOLOGY PROCEEDINGS   67 - 78   2008

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:COAL INDUSTRY PUBL HOUSE  

    This paper deals with the relevance of numerical modeling with respect to mechanical properties of rock proposed, and discusses the applicability of rock fall simulation by using discontinuous deformation analysis (DDA). In order to foresee collapse of rock slope, numerical method will be extremely useful. However, it will be difficult to simulate collapsed, considering difficulties of rock parameter, such as geology, fracture, fault and laboratory testing into numerical calculation. We present the way to modeling the jointed rock mass to evaluate the rock slope instability, and a simulated result for an actual rock mass collapse are shown. Furthermore, it was discussed that the applicability of rock fall simulation by using DDA for numerical experiments and the investigation of rock fall in the northern part of Japan. In order to predict the behavior of rock fall, the energy loss model considering collision has been built in the original DDA. The energy loss caused by slope absorbability can be clarified in this model. The improved DDA is supposed to be very useful for rock fall analysis and measures design.

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  • 現場計測データに基づく岩盤挙動の一考察

    吉田 次男, 大西 有三, 西山 哲

    電力土木 = Electric power civil engineering   ( 330 )   9 - 18   2007.7

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  • Automatic Target Detection for Vision Metrology with Using Colored Target

    MURAKAMI Osamu, AMANO Kiyoyuki, NISHIYAMA Satoshi

    Journal of the Japan Society of Photogrammetry and Remote Sensing   46 ( 1 )   39 - 46   2007.3

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  • STUDY OF HAZARD MAPS FOR RISK ASSESSMENT ON ROCK MASS FAILURE

    KUWANO Takeshi, OHNISHI Yuzo, NISHIYAMA Satoshi, SASAKI Yasuhito, KAWAKITA Minoru

    Doboku Gakkai Ronbunshuu C   63 ( 3 )   901 - 912   2007

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    Hazard maps support effective disaster management of rock mass failure. In this study we compiled reliability prediction charts of hazard areas caused by rock mass failure debris, which are the basis of hazard maps. In addition to the predicted debris hazard areas, we took into account other factors such as rock slope stability and the effects of countermeasures obtained from published data to prepare hazard maps for risk assessment. Applying map-based risk assessment to rock mass failure allowed us to visually identify risks by size, location, and section, consequently enabling reasonable logical judgment from a broad perspective in setting priorities for countermeasures and inspections against rock mass failure.

    DOI: 10.2208/jscejc.63.901

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  • Visualization of a deformed structure by the Photogarmmetry

    Shiozaki Masando, Shinozaki Hiroo, Nishiyama Satoshi, Ohnishi Yuzo

    JOURNAL OF APPLIED COMPUTING IN CIVIL ENGINEERING   16 ( 0 )   149 - 158   2007

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    Photogrammetry is the technique to measure the form of 3-dimensional objects by analyze the pictures of reflective targets on the objests. Conventional measures need three divices to measure the 3-D deformations, however Photogrammetry can measure the deformations by one device. We tried to apply this technique for measuring 3-D deformation of a concrete structure under the cyclic load. The expected failure mode is due to buckling of enclosed reinforcements. 3-D deformations are necessary to clarify the behavior of specimen. As the results, it was possible that this technique has an accuracy and can visualize the process of deformation.

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  • Deformability of Several Granitic Rocks and Gabbros in Uniaxial Tension

    LIN Weiren, TAKAHASHI Manabu, FUJII Yukiyasu, NISHIYAMA Satoshi, TAKEMURA Takato

    Journal of the Society of Materials Science, Japan   56 ( 7 )   654 - 659   2007

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    In order to understand and model relations between microstructure of rocks and their physical properties, uniaxial tension tests were conducted on specimens of nine granitic rocks included a granite, four granodiorites and four tonalities, and two gabbros which were taken from eastern Japan. The axial and transversal deformability of these rocks was determined based on strain measurements using wire strain gauges. The experimental test results revealed that deformational properties of the rocks investigated varied depending on their petrographic features. However, the axial strain and the lateral strain characteristics showed a similar trend for all the rocks, i.e. the stress-strain curves were non-linear throughout the whole stress range from the initial point of loading to the point of ultimate failure. Moreover, the tangent Young&#039;s modulus and the ratio of the lateral strain to the axial strain decreased monotonously with the increasing of the axial stress. Still, the deformational properties were different for individual rocks in a quantitative sense. In particular, the difference in the lateral strains among different rocks was more distinct than that in the axial strains. For example, the Poisson&#039;s ratio at a stress level equal to 50% of the ultimate strength of a granodiorite was very low, close to zero. Furthermore, the Poisson&#039;s ratio of a tonalite was lower than that of a granodiorite, and assumed a negative value. This effect occurred because the lateral strain became positive as it changed from contraction at the initial stage of loading to extension at higher stress levels. There is no ready explanation for this phenomenon; it is believed, however, that it occurs due to microcracks pre-existing in rock materials and/or weak bonds between the adjacent mineral grains.

    DOI: 10.2472/jsms.56.654

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  • STUDY ON RAINFALL INFILTRATION FACILITIES OF PERMEABLE PAVEMENTS

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, KITAYAMA Michiya, WADA Minoru

    JOURNAL OF PAVEMENT ENGINEERING, JSCE   12   99 - 106   2007

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    The rainfall storage and infiltration facilities of permeable pavements have been attracted attention as an improvement measure of urban environment. In this paper, experimental study makes clear that rainfall infiltration facilities of permeable pavements are strongly dependant on rainfall intensity and unsaturated zones prevent rainfall from infiltrate into the pavement. We develop the simulation method that analyze the air and seepage flow simultaneously and we demonstrate that the dependence of rainfall infiltration facilities on rainfall intensity is mainly caused by the behavior of air flow in the pavement. It is shown that the effects of permeable pavements on flood control can be evaluated accurately by using this simulation method.

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  • STUDY ON VARIOUS PROPERTIES CHANGE OF PERMEABLE PAVEMENTS WITH INFILTRATION OF RAIN WATER

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, KOSEKI Hiroji

    JOURNAL OF PAVEMENT ENGINEERING, JSCE   12   107 - 114   2007

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    The permeable pavements are mainly constructed for the purpose of cultivating ground water and mainly applied on the sidewalk. It was admitted that permeability was effective for flood which increases rapidly in the city. And application on a heavy traffic road is also considered now in regarding to a recent law about control runoff. Therefore, test constructions are tried in various places. However, it is necessary to solve problems, such as durability, to apply permeable pavements to the roadway. Especially, aggregates of granular materials moves by infiltration of rain water and the quality have been changed. This paper verified the quality change of granular materials by the infiltration of rain water.

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  • STUDY ON MECHANICAL AND PERMEABLE PROPERTIES OF ROCK JOINTS USING SHEAR-FLOW COUPLING TESTS UNDER CONSTANT NORMAL STIFFNESS CONDITIONS

    YANO Takao, OHNISHI Yuzo, NISHIYAMA Satoshi

    Doboku Gakkai Ronbunshuu C   63 ( 1 )   110 - 124   2007

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    In order to understand the mechanical and permeable properties of rock masses for construction of underground structures, shear-flow coupling tests of specimens having a single rock joint were performed under constant normal stiffness conditions. In the tests, how the permeable properties depend on various physical parameters, such as normal stress, joint surface roughness and hydraulic gradient, were examined. The results show the relationship between the mechanical and permeable properties of rock joints in relation to pore structures created by surface roughness under shear process.

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  • STUDY ON ANALYTICAL METHOD FOR ROCK FALL SIMULATION

    MA Guichen, MATSUYAMA Hiroyuki, NISHIYAMA Satoshi, OHNISHI Yuzo

    Doboku Gakkai Ronbunshuu C   63 ( 3 )   913 - 922   2007

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    This paper developed a rock fall simulation by using discontinuous deformation analysis (DDA). In the simulation, the energy loss of rock fall was expressed respectively in response to every movement feature of rock fall by using absolute parameter. The energy losses of the rock fall were categorized to three forms of the energy loss in friction, the energy loss considering collision and the energy loss by vegetation. The energy loss model by using absolute parameter have been built in the DDA method. Additionally, using the improved DDA, the simulation of field rock fall experiments was performed. The results of the movement feature, velocity and the jump height of the rock fall were in good agreement with the field experiment. Herewith, the new technique considering the slope absorbability, vegetation condition and shapes of the falling rock block has been established a new methodology for design of road disaster prevention of rock falls.

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  • Visualization of a deformed structure by the Photogarmmetry

    Shiozaki Masando, Shinozaki Hiroo, Nishiyama Satoshi, Ohnishi Yuzo

    JOURNAL OF APPLIED COMPUTING IN CIVIL ENGINEERING   16   149 - 158   2007

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    Photogrammetry is the technique to measure the form of 3-dimensional objects by analyze the pictures of reflective targets on the objests. Conventional measures need three divices to measure the 3-D deformations, however Photogrammetry can measure the deformations by one device. We tried to apply this technique for measuring 3-D deformation of a concrete structure under the cyclic load. The expected failure mode is due to buckling of enclosed reinforcements. 3-D deformations are necessary to clarify the behavior of specimen. As the results, it was possible that this technique has an accuracy and can visualize the process of deformation.

    DOI: 10.2208/journalac2003.16.0_149

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  • STUDY ON VERIFICATION OF ROCKFALL SIMULATION USING IMPROVED DDA CONSIDERING THE CHARACTERISTICS OF VELOCITY ENERGY RATIO AT IMPACT

    SHIMAUCHI Tetsuya, OHNISHI Yuzo, NISHIYAMA Satoshi, SAKAI Naoki

    土木学会論文集   62 ( 3 )   707 - 721   2006.10

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  • Mechanism of discontinuous behavior of rock mass during underground cavern excavation

    Tsugio Yoshida, Yuzo Ohnishi, Satoshi Nishiyama

    Zairyo/Journal of the Society of Materials Science, Japan   55 ( 5 )   501 - 506   2006.5

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    Various kinds of measurements were carried out during excavation of two large underground caverns to estimate rock behavior as a discontinuous material. As a result, rock behavior as a discontinuous material was estimated in detail, such as characteristics of crack propagation, displacement and stress redistribution. In particular, it was found that characteristics of displacement and stress redistribution were very remarkable in some areas and that crack propagation was also remarkable in the area. Through the measurements, it was suggested that the sliding of discontinuities were related to the discontinuous behavior. So with a simulation in which the discontinuities were modeled, the influence of the sliding of the discontinuity to crack propagation, displacement and stress redistribution is discussed.

    DOI: 10.2472/jsms.55.501

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  • EXPERIMENTAL STUDY ON THE EFFECTS OF PERMEABLE PAVEMENTS ON THE IMPROVEMENT OF HEAT ENVIRONMENT IN URBAN AREA

    KITAYAMA Michiya, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, YAMAMOTO Tsuyoshi

    JOURNAL OF PAVEMENT ENGINEERING, JSCE   11   49 - 57   2006

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    In these days, some attempts have been made at the improvement of heat environment in urban area by constructing permeable pavements in carriageway area. We have tried to establish the measuring method of evaporation from permeable pavements. And also, we have conducted experiments and have measured evaporation, temperature and volumetric water content on the permeable pavement model, which structure is the same as that of Route 163, in order to examine the effectiveness of permeable pavements. The results show that the proposed method can be useful and evaporation contributes to lower surface temperature of permeable pavements.

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  • Study on Prediction Ahead of Tunnel Face by Using Drilling Survey Method

    KIMURA Tetsu, OHNISHI Yuzo, NISHIYAMA Satoshi, ISHIYAMA Koji

    Geological data processing   16 ( 3 )   191 - 198   2005.9

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    We report the study on the evaluation method of ground classification ahead of tunnel face using drilling data such as drilling speed, specific drilling energy and damping pressure and discuss the applicability of the drilling survey system to the tunnel construction field. Moreover, the neural network system on the basis of a learning data has been introduced to analyze the drilling data automatically and objectively. We demonstrate the advantage of the drilling survey system making a precise decision of ground classification without human experiences from the experimental results.

    DOI: 10.6010/geoinformatics.16.191

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  • EXPERIMENTAL STUDY ON SHEAR-FLOW COUPLING CHARACTERISTICS OF SINGLE JOINTS IN ROCK MASSES

    YANO Takao, OHNISHI Yuzo, NISHIYAMA Satoshi, SAITO Ryohei

    土木学会論文集 = Proceedings of JSCE   ( 792 )   159 - 174   2005.6

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  • Study on Hydraulic Behaviour of a Single Rock Joint under Shear Deformation

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, TAKAHASHI Manabu, CHIBA Shuhei

    Journal of the Japan Society of Engineering Geology   45 ( 6 )   291 - 303   2005.2

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    For the purpose of understanding the hydraulic behaviours of rock joints undergoing shear deformations, the shear-flow coupling experiments were performed. The results indicated that the macrosopic permeable characteristics are greatly affected by the microscopic structures of joint surface, and the cubic law, which is popularly used for permeability characteristics evaluation, cannot be applied where the mechanical aperture width is small in the early stage of shearing. In order to evaluate the relationship between fluid flow phenomena and aperture distribution in a rock joint, the numerical analysis based on Lattice Gas Automaton (LGA) was applied to simulate complicated microscopic flows produced by the complex boundary conditions. It was possible by the simulation method to explain the hydraulic behaviours in shear-flow coupling experiments by fluid-wall boundary interaction when water flows through a rock joint.

    DOI: 10.5110/jjseg.45.291

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  • STUDY ON APPLICATION OF PRECISE PHOTOGRAMMETRY TO THE MONITORING SYSTEM OF SLOPE

    OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, OGATA Kenji, MATSUYAMA Hiroyuki

    土木学会論文集 = Proceedings of JSCE   2004 ( 771 )   187 - 197   2004.9

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    The paper presents a photogrammetric system with a digital camera as a precise measuring tool for the monitoring of slope stabilities. The least squares solution with a pseudoinverse method, which has the advantage of the flexibility of measurement, is introduced by both of mathematic and geometric concepts to transform two dimensional digital image coordinates into three dimensional object space coordinates without the incorporation of control data. In the paper, experiments have been also conducted to quantitatively examine the accuracies and precision of this solution, and the results show that this measurement system has high potential applicability in deformation monitoring of a slope.

    DOI: 10.2208/jscej.2004.771_187

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  • A Study about Application of a Digital Image Measurement Method to Monitoring System for a Protection against Disasters in Slope

    NISHIYAMA Satoshi, OHNISHI Yuzo, OHTSU Hiroyasu, YANO Takao, RYU Meiji, LEE Der-Her

    Journal of the Japan Society of Engineering Geology   44 ( 6 )   331 - 340   2004.2

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    In each country of Southeast Asia, there has been lots of slope hazard including a landslide and a slope collapse caused by the geological feature condition and climate condition, and rapid city development will increases the disaster in the future. However, the technology about city protection against disasters in these countries has been undeveloped technically. Authors have been developing a monitoring method of slope behaviors by using digital photogrammetry. Photogrammetry is defined as a measuring technique constructing the modeling of a three-dimensional (3D) space using two-dimensional (2D) images. Photogrammetry has the advantage of measuring deformation of an object by some photos with excellent cost performance. This paper proposes that many engineers are able to carry out photogrammeric work without reliance on photogrammeric technicians and shows that photogrammetry has the advantage of measuring deformation of a slope by some photos with easy measurements. When measurements are performed without control points, the normal-equation matrix has a rank deficiency of 7 depending on the three translations, three rotations and the scale in the network of observations. In order to eliminate the rank deficiency of the normal-equation matrix we must find seven additional equations. We present the geometrical analysis for the problem to measure the three-dimensional coordinates of measurement points without control points. This paper also shows a numerical method for calculating sufficiently good initial approximate values. This performance is suitable for a monitoring tool used for a protection against slope hazard in Southeast Asia. This digital photogrammetric system can remove human skills in measurement tasks, so it is possible to use it immediately when necessary. The applicability of digital photogrammetry is discussed with its accuracies in Taiwan. Recently there are a lot of constructed roads passing through the soft rock areas in Taiwan. The main formation of soft rock in this country includes sandstones, shale, and mudstone. Due to the poor engineering properties of soft rock, there are many slope hazards along the road. The digital photogrammetry demonstrates that our method has a high potential to prevent the slope hazards in Southern Asia.

    DOI: 10.5110/jjseg.44.331

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  • THE STUDY ON THE EVALUATION OF THE LOSS DUE TO SLOPE FAILURE CONSIDERING THE UNCERTAINTY ASSOCIATED WITH THE INFORMATION OF ROCK FRACTURES

    OHTSU Hiroyasu, OHNISHI Yuzo, ITO Toshikazu, TAKEYAMA Yuichiro, NISHIYAMA Satoshi

    土木学会論文集 = Proceedings of JSCE   736 ( 736 )   231 - 248   2003.6

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    In this paper, the effect of the uncertainties associated with the spatial distribution of rock fractures on the evaluation of loss due to slope failure was discussed. In detail, in order to model the spatial distribution of rock fractures based on stochastic approach, the methodology related to fracture network model was adopted. Finally, the conclusion made it obvious that the results associated with the evaluation of loss are more seriously affected by the spatial distribution of rock fractures, comparing with the effect of other parameters on the results.

    DOI: 10.2208/jscej.2003.736_231

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  • Study on Digital Photogrammetry for Monitoring System of Deformation in Tunnel

    Yuzo Ohnishi, Takumi Nakai, Meiji Ryu, Satoshi Nishiyama

    Zairyo/Journal of the Society of Materials Science, Japan   52 ( 8 )   1006 - 1011   2003

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    Because deformations are important indicators of the degree of stability during construction of rock structures, monitoring of deformation is a key element of observational method in tunnels. Monitoring can also help determine the depth of the loosened zone, movements on discontinuities, in-situ modulus, and other items that may be dealt with in design. We have studied the applicability of digital photogrammetry for monitoring of surface displacements in civil engineering. Digital Photogrammetry is the technique obtaining three dimensional coordinates of an object by means of digital photography. This photogrammetry has the advantage of measuring deformation of an object by some photos with easy measurements and excellent cost performance. Because the linearized equation to analyze the coordinates of object points has some rank defects due to no control points in tunnel, we present constrained least square estimation to measure the displacements without the incorporation of control point configuration. The results of experiments demonstrated that this measurement system could yield high accurate three dimensional coordinates of target points situated on an object. It is also shown that this digital photogrammetry can monitor the displacements of the tunnel accurately along with a capability of real-time measurement because of removal of human skills in measurement tasks.

    DOI: 10.2472/jsms.52.1006

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  • Methodology for estimation of the strength of rock discontinuities by using shearing tests under constant normal stiffness condition.

    YANO Takao, AOKI Kazuo, OHNISHI Yuzo, OHTSU Hiroyasu, NISHIYAMA Satoshi, TAKAGI Katsumi

    Doboku Gakkai Ronbunshu   2003 ( 729 )   115 - 130   2003

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    In this paper, a shearing test was carried out under constant normal stiffness condition to understand the mechanical characteristics of discontinuities. By using the result of this test, we propose an efficient methodology to estimate the strength parameters &lt;i&gt;c&lt;/i&gt; and &amp;phi;, in case we assume the strength characteristics of discontinuities follow the Mohr-Coulomb&#039;s failure criterion. In addition, we discuss the effect of parameters such as roughness, initial normal stress and normal stiffness on the shearing behavior of discontinuities by comparing the results between the shearing test under constant normal stiffness condition and constant normal stress condition.

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  • Simulation of rock slope failure with three-dimensional discontinuous deformation analysis (3D DDA)

    Jian-Hong Wu, Yuzo Ohnishi, Keiichi Momma, Satoshi Nishiyama

    Zairyo/Journal of the Society of Materials Science, Japan   52 ( 5 )   488 - 493   2003

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    In this paper, both the theory of Three-Dimensional Discontinuous Deformation Analysis (3D DDA), and its application to simulate rock slope failure problems are discussed. DDA belongs to one of the discontinuous numerical analysis methods, and the contact judgment and contact force computation should be concerned to produce contact forces when blocks contact to each other. It is shown that a normal contact spring is employed to calculate the normal contact forces to prevent blocks from penetrating to each other during contacts. However, the normal contact spring is deleted when blocks are leaving. In addition, the failure along discontinuous surfaces can be simulated easily by applying the Mohr-Coulomb failure criterion. The appropriate contact spring arrangement in 3D DDA follows the criterion of "No-penetration and No-Tension" to obtain correct contact forces during contacts. The new approach has been successfully applied to simulate a rock slope toppling at Amatoribashi-nishi site in Japan. The simulation results are quite in agreement with the video pictures obtained from the field. We believe that the simulation is very helpful on investigation of the failure mechanism and process, which can provide useful knowledge for study such events in future.

    DOI: 10.2472/jsms.52.488

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  • Application of drilling survey system for soft rock

    Tetsu Kimura, Masayuki Yamashita, Satoshi Nishiyama

    Zairyo/Journal of the Society of Materials Science, Japan   52 ( 5 )   494 - 499   2003

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    In tunnel constructions, heterogeneity of rock bodies such as faults and related fracture zones can be serious problem for safety management, construction planning and excavation costs. Thus, the estimate of geological conditions and rock properties ahead of the tunnel faces is strongly required and several methods of such fore survey have been proposed by many researchers. For this purpose, we have developed "DRISS", the Drilling Survey System, for fore surveys at tunnel faces with higher accuracy, and report here the application of this system to tunnel construction sites. In this paper, we outline our fore survey system, and show the successful fore survey results including the improvement in drilling techniques at the tunnel construction site with soft rocks.

    DOI: 10.2472/jsms.52.494

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  • SHEAR STRENGTH FORMULA FOR ROCK JOINTS USING PROFILES OF JOINT SURFACE ROUGHNESS

    YANO Takao, AOKI Kazuo, OHNISHI Yuzo, OHTSU Hiroyasu, NISHIYAMA Satoshi, MIZUTA Junichi

    Doboku Gakkai Ronbunshu   722   59 - 73   2002.12

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    It has been known that the mechanical behavior of rock mass strongly depends on these of discontinuities such as faults, fractures and joints. In the rock mechanics literature, several constitutive models to predict joint shear strength have been proposed focusing on effect of geometrical properties of the joint surface roughness. It is shown, however, that some of existing models have problems that these do not quantitatively reflect on geometrical properties. In our study, the statistical parameter related to the strength properties obtained from the results of the direct shear experiments is introduced and a new constitutive model to predict shear strength of rock joint is proposed.

    DOI: 10.2208/jscej.2002.722_59

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  • A CONSIDERATION ON THE ASSESSMENT AND ALLOCATION OF GEOTECHNICAL RISK IN PFI CONSTRUCTION PROJECTS

    OHTSU Hiroyasu, ONOI Yoshiki, OMOTO Toshihiko, OHNISHI Yuzo, NISIYAMA Satoshi, KINOSE Shuusaku

    土木学会論文集 = Proceedings of JSCE   721   193 - 205   2002.12

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  • THE INVESTIGATION OF RISK ASSESSMENT OF ROCK SLOPES CONSIDERING THE SOCIOECONOMIC LOSS DUE TO ROCK FALL

    OHTSU Hiroyasu, OHNISHI Yuzo, NISHIYAMA Satoshi, TAKEYAMA Yuichiro

    土木学会論文集 = Proceedings of JSCE   708   187 - 198   2002.6

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  • Study on the Rigid Body Rotation Problem in Discontinuous Deformation Analysis (DDA)

    WU Jian-Hong, OHNISHI Yuzo, OHTSU Hiroyasu, NISHIYAMA Satoshi

    Journal of applied mechanics   5   191 - 198   2002

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    The separation of rigid body rotation term, r&lt;SUB&gt;0&lt;/SUB&gt;, from the other displacement variables is a breakthrough idea in original discontinuous deformation analysis (DDA) formula. Although the original linear displacement function is a fast and efficient method in computation, it loses accuracy when blocks undergo large rigid body rotations. It can be a significant problem especially when solving the problem with high speed rigid body rotation, such as rock fall problem, or the larger time interval is introduced to the problem with rigid body rotation to obtain the results within less computation steps. Up to date, it is only known that the large rigid body rotation can cause free expansion and change the weight of block in the analysis. However, the authors consider that the problem can also affect the contact judgments in open-close iterations and cause wrong contact forces in the computation. In this paper, this problem will be discussed, and a new method named &amp;ldquo;post contact adjustment&amp;rdquo; is developed and applied to the contact computation terms of DDA. After the improvements, the simulation results show better contact computations and block area preservations even when the large rigid body rotation is carried out.

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  • Anisotropic development of dilatancy in uniaxially compressed granites.

    YANAGIDANI Takashi, NISHIYAMA Satoshi, TERADA Makoto

    Doboku Gakkai Ronbunshu   1987 ( 382 )   63 - 72   1987

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    We examined the azimuthal distributions of circumferential strain, radial deformation, and &lt;i&gt;V&lt;sub&gt;p&lt;/sub&gt;&lt;/i&gt;, &lt;i&gt;V&lt;sub&gt;s&lt;/sub&gt;&lt;/i&gt;&amp;para;, and &lt;i&gt;V&lt;sub&gt;s&lt;/sub&gt;&lt;/i&gt;&amp;perp; of seismic waves traveling through a specimen of granite as it was deformed to faulting under the uniaxial conditions. All measurements were made within the plane perpendicular to the loading axis. It is concluded that anisotropy in physical properties of granite arises from the inherent microcrack fabric and anisotropic ordered alignment of microcracks extended or produced during loading (dilatancy-induced-fabric). Dilatancy anisotropy is much higher than anisotropy due to the natural fabric. The symmetry of physical properties can be characterized by the symmetry of dilatancy-induced-fabric. Based on the Neumann&#039;s principle in crystallography, we can simulate the mechanical behavior of granite with dilatancy-induced-fabric as an orthorhombic crystal.

    DOI: 10.2208/jscej.1987.382_63

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  • 車載型センシング装置を用いた道路法面の 変状抽出法

    三崎 貴雄, 西山 哲, 西条 健一

    第35回日本道路会議   2p02   2023.11

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  • THREE-DIMENSIONAL MONITORING OF SURFACE DEFORMATION USING DIGITAL CAMERAS WITH RTK

    Dosuke Yamamoto, Afia Boney, Satoshi Nishiyama

    Asian Conference on Remote Sensing   No.267   2023.10

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  • APPLICATION OF MMS TO DETECT STRUCTURAL DEFORMATION

    Katsuhiro Ibaraki, Satoshi Nishiyama, Yuji Hoshino

    Asian Conference on Remote Sensing   No.229   2023.10

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  • 3D Monitoring of Coastal Erosion Control Structures Using UAV

    Naoko Sakamoto, Satoshi Nishiyama

    Asian Conference on Remote Sensing   No.144   2023.10

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  • APPLICATION OF THREE-DIMENSIONAL POINT CLOUDS TO RIVER MANAGEMANT USING DRONE SURVEYING

    Mai Ueno, Satoshi Nishiyama

    Asian Conference on Remote Sensing   No.230   2023.10

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  • Study on simulation methods for Design of Rockfall Protection Works

    LU DINGCHENG, Nishiyama Satoshi

    Asian Conference on Remote Sensing   No.179   2023.10

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  • Desk-based survey method for slope hazard investigation using 3D point cloud data

    Wenliang Pan, Shosuke Akita, Satoshi Nishiyama, Masafumi Imanishi

    Asian Conference on Remote Sensing   No.200   2023.10

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  • Monitoring Technology to Support Volume Reduction Construction of Dredged Sediment

    Chika Ito, Satoshi Nishiyama, Naoko Sakamoto

    Asian Conference on Remote Sensing   No.233   2023.10

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  • 車載写真レーザ測量の構造物の変状検知への応用

    茨木克博, 西山哲, 鈴木敏成

    令和5年度土木学会全国大会第78回学術講演会論文集   Ⅵ-137   2023.9

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  • 落石防護工設計のためのシミュレーション技術の研究

    LU DINGCHENG, 西山哲, PAN WENLIANG

    第 48 回地盤工学セミナー報告会   No.12   2023.7

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  • 浚渫土の減容化を支援するモニタリング技術の研究

    伊藤千夏, 西山哲, 田中浩二, 土肥広大, 是松恭介, 西林孝朗

    第 48 回地盤工学セミナー報告会   No.28   2023.7

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  • 車載型センシング装置を用いた道路法面の変状検出法

    三崎貴雄、西山哲, 西条健一、鈴木敏成

    第 48 回地盤工学セミナー報告会   No.29   2023.7

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  • 3 次元点群データを活用した斜面災害調査のための机上調査法

    潘雯靚, 秋田庄亮, 西山哲

    第 48 回地盤工学セミナー報告会   No.25   2023.7

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  • 河川管理のための三次元点群データ活用法

    上野真衣, 西山哲, 冨井天夢, 佐野ひかる

    第 48 回地盤工学セミナー報告会   No.26   2023.7

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  • 河川管理のための三次元点群データ活用法

    上野 真衣, 西山 哲, 冨井 天夢, 佐野 ひかる

    第 75 回 土木学会中国支部研究発表会概要集   Ⅱ-38   2023.6

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  • Application of Image Processing Technology to Crack Behaviour Monitoring

    Afia Boney, Satoshi Nishiyama

    第 75 回 土木学会中国支部研究発表会概要集   VI-8   2023.6

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  • GPS 付デジタルカメラにおける法面変形計測技術の開発

    山本 道輔, 長嶋 奈津美, BONEY AFIA SARAH, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   VI-9   2023.6

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  • 長時間飛行ドローンを活用した 3 次元レーザ測量

    佐野 ひかる, 冨井 天夢, 冨井 隆春, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   Ⅵ-6   2023.6

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  • 浚渫土の減容化を支援するモニタリング技術の研究

    伊藤 千夏, 西山 哲, 茨木 克博, 田中 浩二, 土肥 広大, 井川 広之, 佐々木 隆之, 西林 孝明

    第 75 回 土木学会中国支部研究発表会概要集   VI-7   2023.6

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  • 一時期の UAV グリーンレーザ計測成果を用いた破堤区間における土砂量の算出

    井関 禎之, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   Ⅵ-5   2023.6

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  • 実現場の経験から見た ICT 施工導入の課題と対応策に関する考察

    長江 健三, 岡田 康平, 齋藤 衛, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   VI-20   2023.6

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  • 空気圧送船による循環式浚渫土砂揚土工法

    中原 浩実, 照屋 市朗, 森本 敦, 加山 勝三, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   Ⅶ-11   2023.6

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  • 車載型センシング装置を用いた道路法面の変状抽出法

    三崎 貴雄, 西山 哲, 秋田 庄亮, 茨木 克博

    第 75 回 土木学会中国支部研究発表会概要集   VI-10   2023.6

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  • 港湾工事における ICT 技術の導入に関する考察

    照屋 市朗, 中原 浩実, 井川 広之, 佐々木 隆之, 西林 孝朗, 田中 浩二, 土肥 広大, 茨木 克博, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   VI-19   2023.6

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  • Crack Detection in Asphalt-Paved Top Surface of River Embankments Using Unmanned Aerial Vehicles and Computer Vision Algorithms

    潘 是均, 吉田 圭介, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   Ⅱ-40   2023.6

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  • 3 次元点群データを活用した斜面災害 調査のための机上調査法

    潘 雯靓, 秋田 庄亮, 西山 哲

    第 75 回 土木学会中国支部研究発表会概要集   Ⅲ-37   2023.6

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  • 工業高校生に継続的に講習した「インフラ調査士補講習会」を通した効果的な維持管 理・更新の担い手の育成についての考察

    平手 克治, 西山 哲, 関口 恭史, 柏原 優也

    第 75 回 土木学会中国支部研究発表会概要集   I-16   2023.6

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  • 三次元点群データを用いた斜面災害リスクの抽出方法に関する基礎的事項の整理

    今西将文, 西山哲, 中村公一

    第47回 土木情報学シンポジウム 講演論文集   2022.11

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  • 航空レーザーデータから作成した微地形強調図を用いた効率的で高精度な落石 発生源の机上抽出

    秋田庄亮, 西山哲, 中村公一, 今西将文, 坂本奈温子

    ⽇本応⽤地質学会中国四国⽀部 令和 4 年度 研究発表会論文集   2022.11

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  • グリーンレーザドローンを用いた海岸侵食対策工の 3 次元モニタリング

    茨木克博, 坂本奈温子, 西山哲, 加藤哲, 冨井隆春

    ⽇本応⽤地質学会中国四国⽀部 令和 4 年度 研究発表会論文集   2022.11

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  • APPLICATION OF THREE-DIMENSIONAL POINT CLOUDS FOR RIVER MANAGEMENT USING DRONE SURVEYING

    Nanoka Akiyama, Satoshi Nishiyama

    Geomate 2022   g12180   2022.11

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  • 河川管理へのグリーンレーザドローンを用いた三次元点群の活用法

    秋山菜乃香, 西山哲, 富田紀子, 冨井隆春, 佐野ひかる

    ⽇本応⽤地質学会中国四国⽀部 令和 4 年度 研究発表会論文集   2022.11

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  • MEASUREMENT OF CRACK DISPLACEMENT USING DIGITAL PHOTOGRAMMETRY

    Afia S. Boney, Satoshi Nishiyama, Teruyuki Kikuchi

    Geomate 2022   g12116   2022.11

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  • Automatic Extraction of Rockfall Source based on Terrain Analysis Map Using Support Vector Machine

    N.Sakamoto, K.Sakita, T.kikuchi, S.Nishiyama, J.Song, Y.Ohnishi

    Eurock2022   2022.9

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  • 車載型センシング装置を用いた 道路法面の変状検出法

    野村 碧都, 西山 哲, 佐守 直人, 藤木 三智成

    第47回 土木情報学シンポジウム 講演論文集   2022.9

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  • 落石対策のための航空レーザデータを用いた落石発生源の研究

    秋田庄亮, 西山哲, 崎田晃基

    第47回 土木情報学シンポジウム講演論文集   2022.9

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  • Design og falling rock preventive countermeasure based on three-dimensional simulation

    H.Kitauchi, S.Nishiyama, J.Song

    Eurock2022   2022.9

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  • Application of Three-Dimensional Laser Point Cloud Technology to River Management

    Nanoka Akiyama, Satoshi Nishiyama

    The 4th lnternational Conference on Rock Dynamics and Applications   2022.8

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  • Automatic Extraction of Rockfall Source based on Terrain Analysis Map Using Support Vector Machine

    Naoko Sakamoto, Ohnishi Yuzo, Kikuchi Teruyuki, Junsheng Song, Satoshi Nishiyama, Koki Sakita

    The 4th lnternational Conference on Rock Dynamics and Applications   2022.8

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  • Consideration of countermeasures using rockfall simulation by Discontinuous Deformation Analysis

    Hiroaki Kitauchi, Satoshi Nishiyama, Junsheng Son

    The 4th lnternational Conference on Rock Dynamics and Applications   2022.8

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  • 高密度航空レーザーを用いた効率的,高精度な落石発生源の研究

    秋田庄亮, 西山哲, 坂本奈温子, 﨑田晃基, 富井隆春

    第47回地盤工学セミナー報告会   No.16   2022.6

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  • 落石対策における三次元非質点系シミュレーションの適用

    北内宏明, 西山哲, 島内哲哉, 山本道輔

    第47回地盤工学セミナー報告会   No.25   2022.6

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  • MMS とICP を用いた道路法面の変状検出

    野村碧都, 西山哲, 佐守直人, 藤木三智成

    第47回地盤工学セミナー報告会   No.28   2022.6

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  • 河川管理のための三次元点群技術の活用方法

    茨木克博, 西山哲, 秋山菜乃香, 堺浩一, 富田紀子

    第47回地盤工学セミナー報告会   No.13   2022.6

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  • 三次元非質点系落石シミュレーションの運用方法の検討

    北内 宏明, 西山 哲, 島内 哲哉

    令和4年度(第 74 回)土木学会中国支部研究発表会論文集   Ⅲ-28   2022.5

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  • 河川堤防法面における UAV 測量の精度検証

    長江 健三, 齋藤 衛, 櫻田 裕大, 西山 哲

    令和4年度(第 74 回)土木学会中国支部研究発表会論文集   Ⅵ-10   2022.5

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  • グリーンレーザドローンを使用した海岸侵食対策工の 3 次元モニタリング

    坂本 奈温子, 西山 哲, 岡部 晃

    令和4年度(第 74 回)土木学会中国支部研究発表会論文集   Ⅵ-9   2022.5

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  • 河川管理のための三次元レーザ点群データの活用法

    秋山 菜乃香, 西山 哲, 富田 紀子, 山本 道輔

    令和4年度(第 74 回)土木学会中国支部研究発表会論文集   Ⅵ-11   2022.5

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  • 三次元点群データを用いた斜面災害リスク箇所抽出手法に関する基礎的検討

    中村公一, 今西将文, 西山哲

    第71回 令和4年 砂防学会研究発表会概要集   389 - 390   2022.5

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  • 落石防護工設計のための三次元 DDAの活用

    北内宏明, 西山哲

    自然災害研究協議会 中国地区部会 研究論文集   ( 8 )   47 - 50   2022.3

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  • 圃場の不陸計測のためのグリーンレーザーを使用したドローン測量の研究

    坂本奈温子, 西山 哲, 佐野ひかる

    第76回 農業農村工学会中国四国支部講演会 論文番号 Ⅲ-01   2021.12

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  • 建設 DX に向けた3次元道路台帳の研究

    藤木 三智成, 西山 哲, 西村 大助, 和田 實

    令和3年 交通科学研究会 発表論文集   2021.12

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  • ALTERED ROCKFALL BEHAVIOR OWING TO PARAMETERS IN ROCKFALL SIMULATION USING DISCONTINUOUS DEFORMATION ANALYSIS, Reviewed

    Hiroaki Kitauchi, Satoshi Nishiyama, Koki Sakita

    7th Int. Conf. on Structure, Engineering & Environment (SEE)   128 - 133   2021.11

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  • APPLICATION OF ARTIFICIAL INTELLIGENCE TO RIVER INSPECTION USING UAV Reviewed

    Ryo Yahara, Satoshi Nishiyama, Tomohiro Shimono, Sayuri Yoshioka, Kohei Ogata

    7th Int. Conf. on Structure, Engineering & Environment (SEE)   153 - 158   2021.11

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  • STUDY ON EXTRACTION OF FALLING ROCK SOURCE USING AERIAL LASER DATA TO IMPROVE THE EFFICIENCY OF FALLING ROCK MEASURES Reviewed

    YUQING ZHANG, KOKI SAKITA, SATOSHI NISHIYAMA, TAKEHARU SATO

    7th Int. Conf. on Structure, Engineering & Environment (SEE)   287 - 292   2021.11

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  • DDA 落石シミュレーションのパラメータ が落石挙動に与える影響

    北内 宏明, 西山 哲

    第34回日本道路会議 論文番号4028   2021.11

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  • 落石災害を対象とした道路防災点検効率化 のための地形量図の活用

    坂本 奈温子, 西山 哲, 崎田 晃基

    第34回日本道路会議 論文番号2025   2021.11

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  • APPLICATION OF THREE-DIMENSIONAL LASER POINT CLOUDS TO RIVER MANAGEMENT Reviewed

    Nanoka Akiyama, Satoshi Nishiyama, Koki Sakita, Fumiaki Yamazaki

    7th Int. Conf. on Structure, Engineering & Environment (SEE)   104 - 109   2021.11

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  • QUANTIFICATION OF SLOPE DEFORMATION BY FILTERING OF LASER POINT CLOUD OBTAINED BY MOBILE MAPPING SYSTEM Reviewed

    Naoto Samori, Satoshi Nishiyama, Koki Sakita, Michinari Fuziki, Naoya Ono

    7th Int. Conf. on Structure, Engineering & Environment (SEE)   43 - 48   2021.11

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  • 航空レーザ測量と機械学習を活用した落石発生源の机上抽出

    﨑田 晃基, 菊地輝行, 西山哲

    令和3年 日本応用地質学会 研究発表会 論文番号P7   2021.10

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  • 地形画像による深層崩壊発生前の地形的特徴の定量化

    菊地 輝行, 﨑田 晃基, 西山 哲, 秦野 輝儀, 木村 克己

    令和3年 日本応用地質学会 研究発表会 論文番号65   2021.10

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  • 河川DX実現のための陸上・水中ドローン技術の研究

    秋山菜乃香, 西山哲, 照屋市朗, 中原浩実, 冨井隆春

    令和 3 年度 日本応用地質学会中四国支部 研究発表会 論文番号13   2021.10

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  • 河川管理のためのSLAM技術を導入した三次元レーザ点群の活用方法

    秋山 菜乃香, 西山 哲, 﨑田 晃基

    第76回 土木学会学術講演会論文集 論文番号 CS9-28   2021.9

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  • 2種類の車両走行型計測によるレーザ点群を用いた道路周辺の地物変化の抽出

    佐守 直人, 西山 哲, 﨑田 晃基, 藤木 三智成, 佐藤 直人

    第76回 土木学会学術講演会論文集 論文番号 Ⅳ-83   2021.9

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  • UAVを活用した河川巡視への深層学習手法の適用

    矢原 諒, 西山 哲, 下野 友裕, 吉岡 小百合, 尾方 浩平

    第76回 土木学会学術講演会論文集 論文番号 Ⅵ-882   2021.9

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  • トンネル切羽の崩落監視システムの開発

    尾畑 洋, 村上 治, 西山 哲

    第76回 土木学会学術講演会論文集 論文番号 Ⅵ-448   2021.9

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  • 地形量図を用いた機械学習による落石発生源抽出の検討

    﨑田 晃基, 西山 哲, 菊地 輝行

    第76回 土木学会学術講演会論文集 論文番号 Ⅲ-257   46   293 - 296   2021.9

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  • 3D 都市モデルを用いた不動産登記制度における権利の視覚的表現の検証

    関口 恭史, 谷田 諒, 平手 克治, 西山 哲

    第 73 回 2021年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅳ-8   2021.6

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  • 福島復興知における 3 次元道路台帳を活用したインフラ DX の取り組み

    藤木 三智成, 西村 大助, 阿部 亮吾, 中林 真理子, 鈴木 高宏, 西山 哲, 山崎 健二郎

    第 73 回 2021年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-13   2021.6

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  • グリーンレーザを搭載した UAV 測量の圃場不陸計測への活用

    石崎 未帆, 西山 哲, 﨑田 晃基, 堺 浩一

    第 73 回 2021年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-8   2021.6

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  • DDA 落石シミュレーションにおける落石形状パラメータの検討

    北内 宏明, 西山 哲, 崎田 晃基

    第 73 回 2021年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅲ-17   2021.6

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  • LP 計測データの可視化に利用される各種空間フィルタの比較

    今西 将文, 西山 哲, 中村 公一

    第 73 回 2021年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅲ-5   2021.6

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  • 推進工事における 3 次元測量技術を応用した見える化の実証

    長江 健三, 杉井 良隆, 前田 隼弥, 成田 和人, 西山 哲

    第 73 回 2021年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-6   2021.6

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  • センシング,モニタリング技術の活用 (特集 デジタル革新と基礎工)

    西山 哲

    基礎工 = The foundation engineering & equipment, monthly : 土木・建築基礎工事と機材の専門誌   49 ( 1 )   20 - 23   2021.1

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  • Mobile Mapping Systemで取得したレーザ点群のフィルタリングによる法面変状の定量化

    佐守 直人, 西山 哲, 﨑田 晃基

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   46   233 - 236   2021

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  • LP計測データの可視化に利用される各種空間フィルタの特性比較

    今西 将文, 西山 哲, 中村 公一

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   46   241 - 244   2021

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  • Development of Disaster Waste Quantification Method using Mobile Mapping System

    26 ( 2 )   91 - 98   2021

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  • ROCKFALL INVENTORY MAP SUITABLE FOR SLOPE INSPECTION USING AERIAL LASER SURVEY

    崎田晃基, 今西将文, 西山哲

    岩の力学国内シンポジウム講演論文集(CD-ROM)   15th   2021

  • QUANTIFICATION OF SLOPE DEFORMATION DURING 2 PERIODS USING MOBILE MAPPING SYSTEM

    佐守直人, 西山哲, 崎田晃基, 藤木三智成, 小野尚哉

    岩の力学国内シンポジウム講演論文集(CD-ROM)   15th   2021

  • UAVを活用した河川巡視への人工知能の適用

    矢原諒, 西山哲, 下野友裕, 吉岡小百合, 尾方浩平

    自然災害研究協議会中国地区部会研究論文集(Web)   ( 7 )   2021

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    ZHANG Yoqing, 崎田晃基, 西山哲, 佐藤丈晴

    自然災害研究協議会中国地区部会研究論文集(Web)   ( 7 )   2021

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    石崎未帆, 西山哲, 崎田晃基, 堺浩一

    農業農村工学会中国四国支部講演会講演要旨集   75th   2021

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    西山哲, 冨井隆春, 佐野ひかる, 藤木三智成

    検査技術   26 ( 7 )   2021

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    﨑田 晃基, 菊地 輝行, 西山 哲

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   46   293 - 296   2021

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  • Utilization of topographic map to improve the efficiency of road disaster prevention inspection

    西山哲, 宮下征士, 吉川慶, 黒木紀男

    地盤工学会誌(Web)   69 ( 6 )   2021

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    藤木 三智成, 西山 哲, 西村 大助, 逢坂 直樹

    交通科学研究会 令和 2 年度研究発表会プログラム 講演論文集   2020.12

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  • QUANTIFICATION OF SLOPE DEFORMATION USING LASER POINT CLOUD DATA BY MOBILE MAPPING SYSTEM Reviewed

    641 - 646   2020.11

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  • 斜面点検の効率化に向けた落石発生源のための図面作成

    﨑田 晃基, 西山 哲

    第75回 土木学会学術講演会論文集 論文番号 CS9-62   75th   2020.9

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    坂田 達法, 佐野 ひかる, 西山 哲

    第 72 回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-24   2020.6

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  • グリーンレーザスキャナ搭載ドローン測量技術の応用について

    加藤 哲, 鈴木 義美, 佐野 ひかる, 冨井 隆春, 西山 哲

    第 72 回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-26   2020.6

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  • 実現場の経験から見た i-Construction の課題と解決策の考察

    長江 健三, 中塚 仁視, 成田 和人, 西山 哲

    第 72 回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-23   2020.6

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  • Mobile Mapping System によるレーザ点群データを用いた法面変状の定量化

    佐守 直人, 西山 哲, 﨑田 晃基, 藤木 三智成, 小野 尚哉

    第 72 回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-20   45   97 - 100   2020.6

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  • ドローン撮影画像と機械学習を用いた河川巡視の研究

    矢原 諒, 西山 哲, 﨑田 晃基, 千金良 達哉, 藤木 三智成, 下野 友裕

    第 72 回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-25   2020.6

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  • Monitoring instability steep slope using three-dimension point louds at multiple time,

    Teruyuki Kikuchi, koki Sakita, Satoshi Nishiyama, Teruyoshi hatano

    Proceeding paper of ISRM International Symposium Eurock2020,ISRM-EUROCK-2020-129   2020.6

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  • AI を用いたアスファルト舗装ひび割れの検出

    亀川 昌幸, 西山 哲, 崎田 晃基, 佐守 直人

    第 72回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-6   2020.6

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  • 地方工業高校生が参加する岡山道路パトロール隊を対象とした 維持管理への技術者マイン ドの醸成と今後の取り組み

    平手 克治, 西山 哲, 柏原 優也

    第 72 回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅰ-18   2020.6

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  • SLAM 技術を導入した LiDAR 計測による河川堤防モニタリング手法の開発

    秋山 菜乃香, 矢原 諒, 﨑田 晃基, 吉田 圭介, 西山 哲, 山崎 文明

    第 72 回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-17   2020.6

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  • 圃場の不陸調査における UAV グリーンレーザ計測の活用

    北内 宏明, 西山 哲, 﨑田 晃基, 堺 浩一

    第 72回 2020年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-11   2020.6

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  • Rockfall Inventory Map for Efficient Slope Inspection via Aerial Laser Survey and Signal Processing Techniques

    Koki Sakita, Satoshi Nishiyama, Teruyuki Kikuchi, Junsheng Song, Yuzo Ohnishi

    Proceeding paper of ISRM International Symposium Eurock2020,ISRM-EUROCK-2020-173   2020.6

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  • Disaster report of 2018 July heavy rain for geo-structures and slopes in Okayama Reviewed

    S. NishimuraY, TakeshitaS. NishiyamaS. SuzukiT, ShibataT, ShukuM, KomatsuB. Kim

    Soils and Foundations   60   300 - 314   2020.3

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  • 圃場不陸観測へのUAVグリーンレーザ測量技術の適用

    北内 宏明, 西山 哲, 﨑田 晃基, 堺 浩一

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   45   73 - 76   2020

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  • 画像解析技術を用いたトンネル切羽の落石監視手法の研究

    久保田 恭行, 西山 哲, 矢吹 信喜, 福田 知弘, 手塚 仁, 尾畑 洋, 村上 治

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   45   225 - 228   2020

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  • 機械学習に対する前処理が舗装撮影画像からのひび割れ検出精度に及ぼす影響の評価

    亀川 昌幸, 西山 哲, 佐守 直人

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   45   201 - 204   2020

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  • LPデータの可視化方法の諸条件に関する基礎的な考察

    今西 将文, 西山 哲, 中村 公一

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   45   113 - 116   2020

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  • Mobile Mapping Systemによるレーザ点群データを用いた法面変状の定量化

    佐守 直人, 西山 哲, 﨑田 晃基, 藤木 三智成, 小野 尚哉

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   45   97 - 100   2020

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  • SLAM技術を導入した携帯型レーザシステムによる河川堤防モニタリング手法の検討

    秋山 菜乃香, 西山 哲, 﨑田 晃基, 山崎 文明

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   45   45 - 48   2020

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  • ウェーブレット解析を用いた落石発生源の調査に適した図化手法の高度化

    﨑田 晃基, 菊地 輝行, 西山 哲

    土木情報学シンポジウム講演集 Proceedings of the symposium on civil engineering informatics   45   69 - 72   2020

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  • Cutting-edge monitoring using drones

    西山哲, 冨井隆春, 佐野ひかる, 大西有三

    地盤工学会誌(Web)   68 ( 11 )   2020

  • Quantitative Interpretation of Landslide Occurrence Site by AI Technology of Image Classification and Topographical Analysis Map Created by Aerial Laser Data

    Koki Sakita, Satoshi Nishiyama, Teruyuki Kikuchi, Junsheng Song, Yuzo Ohnishi

    Proceeding paper of 5th int. Conf. on Science,Engineering & Environment   541 - 546   2019.11

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  • THE VERIFICATION OF DIFFERENCE ANALYSIS IN THE HIGH PRECISION INSPECTION TECHNOLOGY FOR SLOPE SURFACE USING MOBILE MAPPING SYSTEM

    Naoto Samori, Satoshi Nishiyama, Koki Sakita, Michinari Fuziki, Naoya Ono, Junsheng Song

    Proceeding paper of 5th int. Conf. on Science,Engineering & Environment   2019.11

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  • 航空レーザデータ等を活用した斜面・法面点検技術 の効果

    王 てい, 小野尚哉, 田中貴人, 阿曾沼和義, 徳岡杜, 香, 藤木三智成, 西山 哲, 橋中 瞳, 倉光泰樹

    日本応用地質学会 研究発表会 論文番号P8   2019.10

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  • AI 技術を用いた微地形強調図の自動判読による斜面の崩壊地抽出

    﨑田 晃基, 西山 哲, 菊地 輝行

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅷ-9   2019.6

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  • LP 計測密度と判別可能な地物のサイズ等の諸条件に関する基礎的な考察

    今西 将文, 西山 哲, 中村 公一

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅷ-1   2019.6

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  • 防災・減災のためのドローンレーザ測量技術の応用について

    加藤 哲, 鈴木 義美, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅷ-23   2019.6

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  • MMS を用いた浸水痕跡調査手法の検証

    吉川 慶, 嶋田 幸二, 増田 拓人, 島田 英之, 齋藤 美絵子, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅷ-12   2019.6

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  • UAV による三次元測量支援ツールの開発

    堺 浩一, 間野 耕司, 矢尾板 啓, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅳ-20   2019.6

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  • 自動運転による高精度 3 次元地図を活用した道路ストック点検システムの開発

    藤木 三智成, 井上 浩一, 横山 省一, 西山 哲, 加藤 孝志

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅳ-15   2019.6

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  • i-Construction への取り組みについて

    中塚 仁視, 成田 和人, 宮脇 潤, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅳ-21   2019.6

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  • SDA-SWING 法における二次元・三次元流れの考慮の必要性

    久保田 恭行, 森 守正, 安田 亨, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-2   2019.6

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  • 海底地形モニタリングに向けた差分解析手法の検討

    酒井 多樹, 崎田 晃基, 西山 哲, 吉岡 裕嗣, 川村 裕, 間野 耕司

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅳ-27   2019.6

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  • AI を用いたアスファルト舗装ひび割れの検出

    石崎 未帆, 崎田 晃基, 西山 哲, 藤木 三智成

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅳ-11   2019.6

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  • i-Construction の法面工事への適用事例から見た課題と解決策

    坂田 達法, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅵ-10   2019.6

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  • 移動計測車両による法面モニタリング手法のための解析手法の精度検証

    佐守直人, 西山 哲, 崎田晃基, 藤木三智成, 小野尚哉

    第45回地盤工学セミナー 地盤工学会中国支部   2019.6

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  • 社会インフラの維持管理におけるドローンと非破壊検査の今後と展望

    平手 克治, 柏原 優也, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅳ-24   2019.6

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  • 移動計測車両による法面モニタリング手法のための解析手法の精度検証

    佐守 直人, 西山 哲, 崎田 晃基, 藤木 三智成, 小野 尚哉

    第 71 回 2019 年度 土木学会中国支部研究発表会 Ⅰ-22   2019.6

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  • 急傾斜地の崖錐堆積物における UAV レーザ計測を用いた変動解析の試み

    菊地 輝行, 秦野 輝儀, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅷ-21   2019.6

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  • ALB による海底形状の再現性と波浪による影響の検証

    間野 耕司, 今野 洋幸, 堺 浩一, 横田 浩, 西山 哲

    第 71 回 2019年度 土木学会中国支部研究発表会 講演論文集 論文番号Ⅷ-26   2019.6

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  • LP計測密度と判別可能な地物のサイズ等の諸条件に関する基礎的な考察

    今西 将文, 西山 哲, 中村 公一

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   44   9 - 12   2019

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  • 山岳トンネル掘削を対象とした地下水情報化施工における流れの次元に起因する誤差の影響

    久保田 恭行, 森 守正, 安田 亨, 西山 哲

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   44   157 - 160   2019

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  • MMSによる法面モニタリング手法のための差分解析手法の精度検証

    佐守 直人, 西山 哲, 崎田 晃基, 藤木 三智成, 小野 尚哉

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   44   29 - 32   2019

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  • レーザ計測による三次元点群密度と地形判読精度の関係について

    菊地 輝行, 秦野 輝儀, 西山 哲

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   44   25 - 28   2019

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  • Monitoring of Deformation of River Bank Utilizing 3-dimensional Point Clouds Obtained Using Moving Vehicle Measurement

    66 ( 9 )   16 - 19   2018.9

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  • 背景差分法を活用したトンネル切羽の崩落検知システムの開発

    藤岡大輔, 中岡健一, 西山哲

    土木学会年次学術講演会講演概要集(CD-ROM)   73rd   ROMBUNNO.VI‐018   2018.8

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  • 移動計測車両による法面モニタリング手法のための解析手法の精度検証

    崎田晃基, 西山哲, 菊地輝行

    土木学会年次学術講演会講演概要集(CD-ROM)   73rd   ROMBUNNO.VI‐728   2018.8

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  • マサ土斜面の安定性評価と極限平衡法の適用性に関する考察

    笹井 友司, 西垣 誠, 西山 哲

    第 70 回 2018 年度 土木学会中国支部研究発表会 論文番号 Ⅲ-24   2018.6

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  • 維持管理技術者資格「インフラ調査士」資格認証制度から読み解く今後の課題と考察

    平手 克治, 西山 哲, 柏原 優也, 田代 秀夫

    第 70 回 2018 年度 土木学会中国支部研究発表会 論文番号 Ⅳ-22   2018.6

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  • 微地形強調図とタブレット端末を用いた落石調査の効率化に向けた基礎的検証

    吉川 慶, 宮下 征士, 嶋田 幸二, 市原 学, 崎田 晃基, 鈴木 茂之, 西山 哲

    第 70 回 2018 年度 土木学会中国支部研究発表会 論文番号 Ⅲ-34   43   277 - 280   2018.6

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  • i-Construction普及に向けたドローン測量技術の性能評価

    坂田 達法, 平手 克治, 藤木 三智成, 西山 哲

    第 70 回 2018 年度 土木学会中国支部研究発表会 論文番号 Ⅵ-9   2018.6

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  • 落石対策事業効率化のための微地形強調図による落石発生源抽出の研究

    崎田 晃基, 西山 哲, 宮下 征士, 吉川 慶

    第 70 回 2018 年度 土木学会中国支部研究発表会 論文番号 Ⅵ-1   2018.6

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  • 微地形強調図とタブレット端末を用いた落石調査の効率化に向けた検証

    吉川 慶, 宮下 征士, 崎田 晃基, 西山 哲

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   43   277 - 280   2018

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  • MEMS型三軸傾斜計を用いた岩盤斜面崩壊の計測事例

    安住晴, 中村公一, 島内哲哉, 小野和行, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   53rd   ROMBUNNO.0455   2018

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  • DEVELOPMENT OF TUNNEL FACE REAL TIME MONITORING SYSTEM USING IMAGE PROCESSING

    藤岡大輔, 中村隆史, 西山哲, 中岡健一

    岩盤力学に関するシンポジウム講演集(CD-ROM)   45th   ROMBUNNO.10   2018

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  • 浸透水圧を考慮した斜面の安定性評価と極限平衡法の適用性に関する考察

    笹井友司, 西垣誠, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   53rd   ROMBUNNO.1026   2018

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  • Method for Extracting the Source of Falling Rock from Microtopography Highlight Map Created by High-Density Aerial Laser Data,

    Koki Sakita, Satoshi Nishiyama, Masashi Miyashita, Yuzo Ohnishi

    Proceeding of 10th Asian Rock Mechanics Symposium, No.542.   2018

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  • 第28回応用測量論文奨励賞 受賞論文の紹介 MMSによる河川堤防の変形・沈下把握に関する研究

    間野 耕司, 井関 禎之, 森田 真一, 橘 菊生, 西山 哲

    測量 = The journal of survey : 地理空間情報の科学と技術   67 ( 11 )   14 - 17   2017.11

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  • 地方自治体の道路維持管理を効率化する走行型計測システムの開発

    塩崎正人, 河村圭, 西山哲

    土木情報学シンポジウム講演集   42   211‐214 - 214   2017.9

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  • 移動計測車両による河川堤防高計測の検討 Reviewed

    間野耕司, 井関禎之, 森田真一, 橘菊生, 西山哲

    土木情報学シンポジウム講演集   42   197‐200 - 200   2017.9

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  • 背景差分法を用いたトンネル切羽の変状モニタリングに関する研究 Reviewed

    中村隆史, 藤岡大輔, 沖西将弥, 西山哲

    土木情報学シンポジウム講演集   42   113‐116 - 116   2017.9

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  • 異なる2時期の航空ヘリレーザデータを使用した落石発生源抽出検証 Reviewed

    宮下征士, 今西将文, 西山哲

    土木情報学シンポジウム講演集   42   163‐164   2017.9

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  • 特徴点追跡手法を用いた岩盤構造物の変状モニタリングに関する研究

    藤岡大輔, 畑浩二, 西山哲

    土木学会年次学術講演会講演概要集(CD-ROM)   72nd   ROMBUNNO.III‐381   2017.8

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  • 道路防災点検におけるLPデータ・MMSデータの活用と適用性について

    小松恵一, 前田英輝, 近藤恒樹, 西山哲, 本間哲郎, 小更亨, 久保田博之, 間野耕司, 井関禎之, 西川大亮

    砂防学会研究発表会概要集(Web)   2017   752‐753 (WEB ONLY)   2017.5

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  • 3次元レーザー点群を活用した道路管理手法の考察

    藤木三智成, 井上浩一, 西山哲, 和田實

    交通科学   47 ( 2 )   83‐84   2017.3

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  • デジタル写真測量

    西山哲

    地盤工学会誌   65 ( 2 )   34‐35   2017.2

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  • 背景差分法を用いたトンネル切羽の変状モニタリングに関する研究

    中村 隆史, 藤岡 大輔, 沖西 将弥, 西山 哲

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   42   113 - 116   2017

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  • Analytical Consideration for Stability of Embankment on Soft Ground

    HIROTA Akihisa, NISHIYAMA Satoshi, KIMOTO Kazushi, MIZUGUCHI Takashi

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan   64   OS6 - 5   2017

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    <p>Soft and heterogeneous ground is widely distributed in Japan. When embankment is built on soft ground, it is necessary to conduct ground survey and set ground improvement range. The ground improvement range is determined by analysis simulation, and various parameters are necessary for analysis. In this research, we discuss the difference of results by analysis parameters set from the ground survey results.</p>

    DOI: 10.11345/japannctam.64.0_OS6-05

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  • MMSデータを用いた視距不良区間の抽出技術

    吉川慶, 島田英之, 井上薫, 林照悟, 西山哲

    日本道路会議論文集(CD-ROM)   32nd   ROMBUNNO.1078   2017

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  • MEMS型三軸傾斜計による斜面変動監視方法に関する検討

    安住晴, 中村公一, 島内哲哉, 小野和行, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   52nd   ROMBUNNO.0376   2017

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  • S‐DEMデータを活用した斜面動態モニタリング手法

    菊地輝行, 秦野輝儀, 千田良道, 西山哲

    日本地球惑星科学連合大会予稿集(Web)   2017   ROMBUNNO.HDS17‐11 (WEB ONLY)   2017

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  • Development of Analytic Method for Landslide Measurement by Movement Vectors Using S-DEM Data Obtained from Airborne Laser Point Clouds

    KIKUCHI Teruyuki, HATANO Teruyoshi, SENDA Yoshimichi, NISHIYAMA Satoshi

    Journal of the Japan Society of Engineering Geology   57 ( 6 )   277 - 288   2017

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    &lt;p&gt;Airborne laser measurement has been widely known as a surveying technique for acquiring topographic data with a high accuracy, and it has been lately utilized as a differential analysis for evaluating the amount of the sediment caused by a large-scale landslide. However, it is impossible to detect landslide behavior at speed of a few centimeters using aerial laser measurement. In this study, we have developed the analytic method to evaluate landslide variation amount with a high accuracy by discriminating characteristic land features from digital elevation model, which is called S-DEM or Substratum Digital Elevation Model, using laser point clouds at the position shifted from the ground with an arbitrary distance. We also describe the result that it is possible to predict the movement of debris slide occurred in the area of landslide using the method we developed.&lt;/p&gt;

    DOI: 10.5110/jjseg.57.277

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  • Analytical Consideration for Stability of Embankment on Soft Ground

    HIROTA Akihisa, NISHIYAMA Satoshi, KIMOTO Kazushi, MIZUGUCHI Takashi

    NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan   64 ( 0 )   OS6 - 5   2017

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    &lt;p&gt;Soft and heterogeneous ground is widely distributed in Japan. When embankment is built on soft ground, it is necessary to conduct ground survey and set ground improvement range. The ground improvement range is determined by analysis simulation, and various parameters are necessary for analysis. In this research, we discuss the difference of results by analysis parameters set from the ground survey results.&lt;/p&gt;

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  • 移動計測車両による河川堤防高計測の検討

    間野 耕司, 井関 禎之, 森田 真一, 橘 菊生, 西山 哲

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   42   197 - 200   2017

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  • MMSによる河川堤防の変形・沈下把握に関する研究

    間野耕司, 井関禎之, 森田真一, 橘菊生, 西山哲, 西山哲

    応用測量論文集   28   2017

  • Risk prediction of landslide and debris flow using slope gradation map obtained from airborne laser scanning

    鈴木茂之, 宮下征士, 平川武, 藤原身江子, 西山哲

    岡山大学地球科学研究報告(Web)   23 ( 1 )   1‐7 (WEB ONLY)   2016.12

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  • Study of method for detect slope movement considering temperature characteristic of MEMS inclinometer

    安住晴, 中村公一, 島内哲哉, 小野和行, 酒井直樹, 西山哲

    地盤工学シンポジウム論文集(CD-ROM)   60th   ROMBUNNO.4‐5 - 110   2016.12

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  • 山地部航空レーザ測量成果による露岩・転石等抽出

    間野耕司, チャタクリ スバス, 橘菊生, 西山哲

    日本写真測量学会学術講演会発表論文集   2016   135‐136   2016.11

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  • 広域の斜面・法面における変状を高精度に3次元計測するための車両移動型計測手法の研究 (公益信託NEXCO関係会社高速道路防災対策に関する支援基金 平成27年度研究助成の概要(その2))

    西山 哲

    高速道路と自動車 = Expressways and automobiles   59 ( 10 )   41 - 43   2016.10

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  • 構造物モニタリングのための画像計測法の研究

    廣田彰久, 西山哲, 菊地輝行

    土木情報学シンポジウム講演集   41   155‐158 - 158   2016.9

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  • 岩盤工学における3次元計測の応用と展望

    坂田達法, 冨井隆春, 西山哲

    日本材料学会学術講演会講演論文集   65th   1‐2   2016.5

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  • ヒステリシスに着目したMEMS型三軸傾斜計による斜面変動検出方法に関する検討

    安住晴, 中村公一, 島内哲哉, 小野和行, 酒井直樹, 西山哲

    日本地すべり学会研究発表会講演集   55th   2016

  • 傾斜計の温度補正に関する検討

    安住晴, 中村公一, 島内哲哉, 小野和行, 西澤浩, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   51st   ROMBUNNO.0442   2016

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  • Study of method for detect slope movement considering temperature characteristic of MEMS inclinometer

    安住 晴, 中村 公一, 島内 哲哉, 小野 和行, 酒井 直樹, 西山 哲

    地盤工学シンポジウム論文集 地盤工学会 編   60   103 - 110   2016

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  • MEMS型傾斜計計測結果による崩落現象の検討

    中村公一, 安住晴, 島内哲哉, 小野和行, 西澤浩, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   51st   ROMBUNNO.0443   2016

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  • 急傾斜地の地質調査における三次元点群データの活用事例

    菊地輝行, 秦野輝儀, 千田良道, 福井裕康, 西山哲

    日本応用地質学会中国四国支部研究発表会発表論文集   2016   73‐74   2016

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  • 航空レーザ測量を用いた斜面動態モニタリング技術の試み

    菊地輝行, 秦野輝儀, 千田良道, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   51st   ROMBUNNO.0806   2016

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  • 真空吸着パッドを用いたコンクリート壁面移動機構によるインフラ診断ロボットシステム(ALP)の研究開発

    野嶋潤一郎, 伊藤孝, 新井正巳, 林健治, 西山哲, 溝渕利明

    日本ロボット学会学術講演会予稿集(CD-ROM)   33rd   ROMBUNNO.1F2-05   2015.9

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  • 傾斜計計測値の温度補正方法に関する検討

    中村公一, 島内哲哉, 小野和行, 西山哲

    土木学会年次学術講演会講演概要集(CD-ROM)   70th   ROMBUNNO.III-255   2015.8

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  • デジタル画像を利用したひび割れ幅計測法の研究

    壷阪知広, 西山哲, 菊地輝行

    土木学会年次学術講演会講演概要集(CD-ROM)   70th   ROMBUNNO.VI-161   2015.8

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  • MEMSセンサ・ネットワークを用いた地盤挙動モニタリングの研究

    秦野佑也, 西山哲, 岩崎佳介

    土木学会年次学術講演会講演概要集(CD-ROM)   70th   ROMBUNNO.III-292   2015.8

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  • モービルマッピングシステムを活用した道路ストックデータベースの研究 Reviewed

    西山哲, 藤木三智成, 井上浩一, 和田實

    交通科学   45 ( 2 )   109 - 110   2015.3

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  • MEMSセンサ・ネットワークを用いた地盤挙動モニタリングの研究

    秦野佑也, 西山哲, 岩崎佳介, 龍明治

    地盤工学研究発表会発表講演集(CD-ROM)   50th   ROMBUNNO.455   2015

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  • Study of crack width measurement method used a digital photogrammetry

    菊地輝行, 秦野輝儀, 壷阪知宏, 西山哲

    地盤工学シンポジウム論文集(CD-ROM)   59th   ROMBUNNO.1‐2 - 50   2014.11

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  • Study of Velocity Inclination by the measurement using MEMS Inclinometer

    中村公一, 島内哲哉, 塚原健太郎, 小野和行, 西山哲

    地盤工学シンポジウム論文集(CD-ROM)   59th   ROMBUNNO.1‐3 - 56   2014.11

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  • Monitoring of retaining wall and deep-seated landslide Using MEMS

    秦野佑也, 西山哲, 南方菜緒, 壷阪知広, 岩崎佳介

    地盤工学シンポジウム論文集(CD-ROM)   59th   ROMBUNNO.1‐4 - 62   2014.11

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  • MEMSおよび無線技術を用いた計測手法の開発と地すべり斜面への適用

    南方菜緒, 西山哲, 矢野隆夫, 龍明治

    土木情報学シンポジウム講演集   39   125 - 128   2014.9

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  • デジタル画像を用いたひび割れ幅計測システムの研究

    壷阪知広, 西山哲, 矢野隆夫, 菊地輝行

    土木学会年次学術講演会講演概要集(CD-ROM)   69th   ROMBUNNO.VI-502   2014.8

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  • 傾斜計による擁壁の変状計測の試み

    中村公一, 島内哲哉, 小野和行, 塚原健太郎, 西山哲

    土木学会年次学術講演会講演概要集(CD-ROM)   69th   ROMBUNNO.III-193   2014.8

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  • 交通事故対策としての機能が期待された環境改善舗装の維持管理問題に関する考察

    和田實, 西山哲

    交通科学   44 ( 2 )   93 - 94   2014.3

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  • DDAによる落石シミュレーション(落石形状の違いが解析結果に与える影響)

    島内哲哉, 中村公一, 佐々木猛, 西山哲, 大西有三

    岩盤力学に関するシンポジウム講演集(CD-ROM)   42nd   ROMBUNNO.12 - 67   2014

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  • MEMS型三軸傾斜計による法面崩壊の計測事例

    中村公一, 島内哲哉, 小野和行, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   49th   ROMBUNNO.868   2014

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  • Study of Velocity Inclination by the measurement using MEMS Inclinometer

    中村 公一, 島内 哲哉, 塚原 健太郎, 小野 和行, 西山 哲

    地盤工学シンポジウム論文集 地盤工学会 編   59   51 - 56   2014

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  • Monitoring of retaining wall and deep-seated landslide Using MEMS

    秦野 佑也, 西山 哲, 南方 菜緒, 壷阪 知広, 岩崎 佳介

    地盤工学シンポジウム論文集 地盤工学会 編   59   57 - 62   2014

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  • MEMSおよび無線技術を用いた計測手法の開発と地すべり斜面への適用

    南方 菜緒, 西山 哲, 矢野 隆夫

    土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics   39   125 - 128   2014

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  • Study of crack width measurement method used a digital photogrammetry

    菊地 輝行, 秦野 輝儀, 壷阪 知宏, 西山 哲

    地盤工学シンポジウム論文集 地盤工学会 編   59   45 - 50   2014

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  • 河川砂防技術研究開発制度による産学官の連携 車両走行型レーザスキャナを用いた迅速かつ効率的河川堤防検査手法の開発

    西山哲

    河川   ( 807 )   30 - 33   2013.10

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  • MEMSセンサーネットワークを用いた擁壁のモニタリング手法の構築

    南方菜緒, 矢野隆夫, 三村衛, 西山哲

    土木学会年次学術講演会講演概要集(CD-ROM)   68th   ROMBUNNO.VI-342   2013.8

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  • 擁壁のモニタリング手法を目的としたMEMSを用いたセンサネットワークの構築

    南方菜緒, 矢野隆夫, 三村衛, 西山哲

    土木学会関西支部年次学術講演会講演概要集(CD-ROM)   2013   ROMBUNNO.VI-4   2013.5

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  • Development of the mobile mapping system which grasps the transformation of bank etc. with high precision

    55 ( 4 )   6 - 9   2013.4

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  • 道路防災のためのユビキタスセンサネットワークの開発

    西山哲, 田中雄三, 南方菜緒

    日本道路会議論文集(CD-ROM)   30th   ROMBUNNO.2021   2013

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  • 地すべり防止のための擁壁のモニタリング手法の開発

    南方菜緒, 矢野隆夫, 三村衛, 西山哲

    地盤工学研究発表会発表講演集(CD-ROM)   48th   ROMBUNNO.192   2013

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  • 三次元不連続変形法の接触機構と落石到達距離の評価

    佐々木猛, 萩原育夫, 三木茂, 大西有三, 西山哲, 小山倫史

    岩の力学国内シンポジウム講演論文集(CD-ROM)   13th   ROMBUNNO.13   2012.12

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  • 写真測量の斜面挙動監視への適用に関する研究

    岸中伸浩, 西山哲, 矢野隆夫, 菊地輝行

    情報地質   23 ( 2 )   74 - 77   2012.6

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  • 写真測量の斜面計測を目的とした研究

    岸中伸浩, 西山哲, 矢野隆夫, 菊地輝行

    日本材料学会学術講演会講演論文集   61st   54 - 55   2012.5

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  • わかって使うレーザ計測 7.事例その4:車両搭載型レーザ計測装置の利用

    西山哲, 沢田和秀, 里優

    地盤工学会誌   60 ( 3 )   63-66,1(2)   2012.3

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  • 210 A study on photogrammetry for retaining wall

    Kishinaka Nobuhiro, Nishiyama Satoshi, Yano Takao, Kikuchi Teruyuki

    61   54 - 55   2012

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  • 210 A study on photogrammetry for retaining wall

    Kishinaka Nobuhiro, Nishiyama Satoshi, Yano Takao, Kikuchi Teruyuki

    学術講演会講演論文集   61   54 - 55   2012

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  • 構造物の維持管理のためのひび割れ幅の画像計測手法の研究

    金澤彬, 西山哲, 矢野隆夫, 菊地輝行

    岩盤力学に関するシンポジウム講演集(CD-ROM)   41st   ROMBUNNO.59   2012

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  • DDAによる落石形状を考慮したモンテカルロ解析

    中村公一, 島内哲哉, 佐々木猛, 西山哲, 大西有三

    地盤工学研究発表会発表講演集(CD-ROM)   47th   ROMBUNNO.901   2012

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  • 不連続変形法(DDA)による三次元落石解析の計算精度要因とモデル化の検討

    佐々木猛, 萩原育夫, 三木茂, 大西有三, 西山哲, 小山倫史

    岩盤力学に関するシンポジウム講演集(CD-ROM)   41st   ROMBUNNO.40   2012

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  • 地盤の可視化・画像処理(2.調査・分類,総括,<特集>第47回地盤工学会研究発表会)

    西山 哲

    地盤工学会誌   60 ( 12 )   2012

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  • 地盤の可視化・画像処理(2.調査・分類,総括,<特集>第47回地盤工学会研究発表会)

    西山 哲

    地盤工学会誌   60 ( 12 )   13 - 13   2012

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  • River management of future -Germinating efforts in the field- Development of measurement system of river dike displacements using an onboad laser scanner

    西山哲

    河川   ( 781 )   47 - 51   2011.8

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  • 土木構造物の維持管理のための画像計測法の研究

    金澤彬, 西山哲, 矢野隆夫, 村上治, 菊地輝行

    土木学会年次学術講演会講演概要集(CD-ROM)   66th   ROMBUNNO.VI-152   2011.8

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  • 電波位相差変位計測の斜面変位モニタリングへの適用性に関する検討

    里優, 西山哲, 矢野隆夫, 吉崎互

    土木学会年次学術講演会講演概要集(CD-ROM)   66th   ROMBUNNO.CS9-007   2011.8

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  • 岩盤構造物の維持管理のための画像計測法の研究

    金澤彬, 西山哲, 矢野隆夫, 菊地輝行

    日本材料学会学術講演会講演論文集   60th   41 - 42   2011.5

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  • 物理探査(2.調査・分類,総括,<特集>第46回地盤工学研究発表会)

    西山 哲

    地盤工学会誌   59 ( 12 )   23 - 23   2011

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    Other Link: http://dl.ndl.go.jp/info:ndljp/pid/10420929

  • 405 A study on measurement with image processing for maintenance of rock structures

    Kanazawa Akira, Nishiyama Satoshi, Yano Takao, Kikuchi Teruyuki

    学術講演会講演論文集   60   41 - 42   2011

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  • RAINWATER OUTFLOW SUPPRESSION EFFECT OF THE PAVEMENT FOR LANDSCAPE HAVING PERMEABILITY

    MORIISHI Kazushi, NISHIYAMA Satoshi, YANO Takao, KOSEKI Hiroji, OHNISHI Yuzo

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)   67 ( 3 )   I_155 - I_163   2011

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    &amp;nbsp;In order to evaluate runoff control proper ties of three types of permeable pavements, namely, porous asphalt pavement, permeable interlocking concrete pavement and water-holding interlocking concrete pavement, experimentally obtaining permeability and water retentivity of each pavement material, this study conducted rainfall-runoff simulation of the three pavements using UNSA-2D, an numerical analysis program of saturated-unsaturated seepage flow. The input parameters of the numerical simulation were determined by fitting van Genuchten (VG) model or Irmay model into the experimental results. The simulation was performed under constant rainfall condition of three rainfall intensities and varying rainfall condition of center-peaked pattern. The results of numerical simulation revealed runoff characteristics of the three pavements, such as the temporal change in storage and infiltration with time, the runoff beginning time depending on the rainfall intensity and so on.

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  • STUDY ON DISPERSION OF LONGITUDINAL ELASTIC WAVES IN ROCK SPECIMENS

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, TAKAHASHI Manabu, YOSHIMURA Kimitaka, ANDO Ken-ichi

    Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering)   67 ( 2 )   288 - 298   2011

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    &amp;nbsp;In order to estimate the permeable properties and pore fluid properties in the ground, survey methods using dispersion and attenuation of elastic waves have been developed. The Biot theory have been applied to the frequency-dependent dispersion data, but the influence of geological properties on velocity dispersion and the relation between the permeable properties and velocity dispersion in rock specimens have not become clear. Sedimentary rock and granite specimens were tested using longitudinal waves for the difference of velocity dispersion phenomena observed in each specimen, and we examine whether the Biot theory can be applied to observed experimental data. Moreover, we tried to estimate the permeability of the rock specimen based on the theory and show that the Biot-squirt theory can be applied to estimating rock permeability using the seismic wave dispersion characteristics.

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  • SATURATED - UNSATURATED HYDRAULIC PROPERTIES OF SUBBASE COURSE MATERIAL AND SUBGRADE SOIL

    YANO Takao, NISHIYAMA Satoshi, NAKASHIMA Shin-ichiro, MORIISHI Kazushi, OHNISHI Yuzo

    Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)   67 ( 2 )   120 - 130   2011

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    &amp;nbsp;In order to evaluate the rainwate r storage and infiltration properties of the permeable pavement by unsaturated seepage analysis or gas-liquid two-phase flow analysis, it is important to know the unsaturated hydraulic properties of materials wh ich constitute the pavement. For this reason, we showed the unsaturated hydraulic properties of porous asphalt material s but we have not clarified the relation between the performance of the permeable pavement and the properties of all constituti on materials. In this paper, we try to determine the unsaturated hydraulic properties of subbase course and subgrade materials that greatly affect the rainwater storage and infiltration properties of the permeable pavement. We show from experiments that water retention characteristic and the un saturated hydraulic properties of subbase course and subgrade materials well match the van Genuchten model and the Irmay model.

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  • 物理探査(2.調査・分類,総括,<特集>第46回地盤工学研究発表会)

    西山 哲

    地盤工学会誌   59 ( 12 )   2011

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  • Study on a measurement method of slope displacement using a radio unit

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, SATO Masaru, YOSHIZAKI Wataru

    Japanese Geotechnical Journal   6 ( 4 )   503 - 511   2011

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    This paper describes the method that measures displacements from the three dimensional coordinate of the radio wave transmitter attached on the slope by the phase differences of received signals that were received by the receivers in the slope surroundings. Concretely, the special low power radio wave emitted by the transmitter on the slope was received by four or more receivers, and then the transmitter coordinates were calculated by an intersection of iso-phase-difference surfaces of each received signal. In the study, we consider the calculation method of the transmitters&amp;rsquo; coordinate values and prove by the experiments that we can in real time measure the slope displacement with a high degree of accuracy by using devices with the radio wave of the frequency of 2.4GHz. We show that we can estimate the precision using GDOP that is determined by geometrical arrangement of the transmitters and receivers and verify the applicability of the proposed method in a real slope.

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  • 不連続変形法による降雨に起因する斜面崩壊の予測解析

    入江敬, 小山倫史, 酒井直樹, 西山哲, 安田祐樹, 大西有三

    岩盤力学に関するシンポジウム講演集(CD-ROM)   40th   2011

  • Flood control properties of permeable pavement

    Journal of the Society of Materials Science,Japan   59 ( 7 )   560 - 566   2010.7

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  • 29. A Study on the Monitoring Method of Rock Slope Movement, Using Narrow-band Wireless Communication System

    Hagiwara Ikuo, Nishiyama Satoshi, Shimauchi Tetsuya, Yamamoto Tsuyoshi

    21   57 - 58   2009

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  • 29. A Study on the Monitoring Method of Rock Slope Movement, Using Narrow-band Wireless Communication System

    Hagiwara Ikuo, Nishiyama Satoshi, Shimauchi Tetsuya, Yamamoto Tsuyoshi

    研究発表会講演論文集   21   57 - 58   2009

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  • RESEARCH REGARDING THE TEMPERATURE REDUCTION EFFECT BY PERMEABLE PAVEMENTS/WATER RETENTIVE PAVEMENTS

    AOKI Kazuo, TANAKA Toshiya, NISHIYAMA Satoshi, YANO Takao

    29   92 - 94   2008.10

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  • A stud for h draulic propert estimation using elastic wave velocit dispersion : A case stud in cr stalline roc

    YOSHIMURA Kimitaka, SAKASHITA Susumu, BRUINES Patrick, ANDO Ken-ichi, OKUMURA Hirohumi, NISHIYAMA Satoshi, OHNISHI Yuzo

    118   194 - 197   2008.5

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  • 111 Experimental research on the unsaturated seepage characteristics of porous asphalt concrete

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, TANAKA Yutaka, TAKEMOTO Tsuneyuki

    57   21 - 22   2008

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  • 112 Experimental research on the unsaturated seepage characteristics of granular materials

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, TANAKA Yutaka, TAKEMOTO Tsuneyuki

    学術講演会講演論文集   57   23 - 24   2008

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  • 111 Experimental research on the unsaturated seepage characteristics of porous asphalt concrete

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, TANAKA Yutaka, TAKEMOTO Tsuneyuki

    学術講演会講演論文集   57   21 - 22   2008

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  • 114 Excavation Method of underground Cavern

    NISHIMURA Tsuyoshi, OKAMOTO Shinichi, OHNISHI Yuzo, NISHIYAMA Satoshi

    学術講演会講演論文集   57   27 - 28   2008

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  • 112 Experimental research on the unsaturated seepage characteristics of granular materials

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, TANAKA Yutaka, TAKEMOTO Tsuneyuki

    57   23 - 24   2008

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  • Study on Three Dimensional Real-Time Measurement Method of Displacement Using a Radio Wave

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, NISHIKAWA Keiichi

    55 ( 11 )   5 - 7   2007.11

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    Numerous locations in Japan are potentially prone to slope failure. To deal with slope failure, it is crucial to establish a measurement technology that can quickly provide necessary data for adopting effective measures. In this study, the method of measuring slope displacements using a radio wave is explored and its validity examined. The use of a radio wave has lots of advantages : to allow the extensive area-wide tracking of three dimensional deformations in real-time, and to allow remote measurements with high accuracies and precisions. We plan to enhance the practicality of this method by offering more slope monitoring application examples.

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    Other Link: http://dl.ndl.go.jp/info:ndljp/pid/10445329

  • Study on Three Dimensional Real-Time Measurement Method of Displacement Using a Radio Wave

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, NISHIKAWA Keiichi

    土と基礎 = Soil mechanics and foundation engineering   55 ( 11 )   5 - 7   2007.11

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    Numerous locations in Japan are potentially prone to slope failure. To deal with slope failure, it is crucial to establish a measurement technology that can quickly provide necessary data for adopting effective measures. In this study, the method of measuring slope displacements using a radio wave is explored and its validity examined. The use of a radio wave has lots of advantages : to allow the extensive area-wide tracking of three dimensional deformations in real-time, and to allow remote measurements with high accuracies and precisions. We plan to enhance the practicality of this method by offering more slope monitoring application examples.

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  • Experimental study on hydraulic tomogram prediction using elastic wave velocity dispersion

    YOSHIMURA Kimitaka, SAKASHITA Susumu, BRUINES Patrick, ANDO Ken-ichi, OKUMURA Hirohumi, NISHIYAMA Satoshi, OHNISHI Yuzo

    物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference   116   133 - 136   2007.5

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  • 弾性波トモグラフィによる岩盤透水性分布評価手法の開発

    奥村 裕史, 吉村 公孝, 安藤 賢一, 西山 哲

    電力土木 = Electric power civil engineering   ( 329 )   62 - 65   2007.5

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  • 308 The monitoring of slope by advanced precise photogrammetry with the prior information

    KANAGAWA Shinji, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, RYU Meiji

    学術講演会講演論文集   56   57 - 58   2007

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  • 303 Integrity evaluation of tunnel with crack detection by using image processing

    HANDA Kenichi, OHNISHI Yuzo, NISHIYAWA Satoshi, YANO Takao, NISHIKAWA Keiichi, YAMAMOTO Tomizo

    学術講演会講演論文集   56   47 - 48   2007

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  • 307 A consideration for the bearing capacity change of the granular materials of permeable pavements

    MORIISHI Kazushi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, ISHIKAWA Ken

    学術講演会講演論文集   56   55 - 56   2007

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  • 306 Study of the experiment about velocity dispersion of elastic wave based on poroelastic medium

    KATSU Kenta, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, TAKAHASHI Manabu, OKUMURA Hirofumi, ANDO Kenichi, YOSHIMURA Kimitaka

    学術講演会講演論文集   56   53 - 54   2007

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  • 311 Field Test of Radio PhaseDisplacement Measurement System

    NISHIKAWA Keiichi, TACHIBANA Syoko, NISHIYAMA Satoshi, ONISHI Yuzo

    学術講演会講演論文集   56   63 - 64   2007

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  • Study for hydraulic property estimation in fractured rock using elastic wave velocity dispersion

    YOSHIMURA Kimitaka, SAKASHITA Susumu, ANDO Ken-ichi, HASHIMOTO Shuji, BRUINES Patrick, OKUMURA Hirofumi, NISHIYAMA Satoshi, OHNISHI Yuzo

    物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference   115   201 - 204   2006.10

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  • 車道透水性舗装モデルの機能性評価--産・学・官の取組み

    木下 孝樹, 和田 実, 西山 哲

    舗装   41 ( 5 )   5 - 9   2006.5

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  • Long Term Monitoring for Disaster Prevention by Radio Phase Displacement : An Experimental Result

    AMISHIMA Takeshi, SUZUKI Nobuhiro, OKAMURA Atsushi, YOSHIZAKI Wataru, KURODA Etsuji, NISHIKAWA Keiichi, OHNISHI Yuzo, NISHIYAMA Satoshi

    IEICE technical report   106 ( 1 )   139 - 144   2006.4

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    A novel displacement measurement method using radio wave for disaster prevention and monitoring has been proposed. In the method, transmitters are attached on multiple measurement points, while, passive sensors, which receive the transmitted radio waves, are set on static points. Comparing phase angles of received radio waves, displacement of measurement points can be estimated simultaneously with high accuracy. Especially, we also developed a modified method calibrating the phase fluctuations of receiving channels. Physical experiment was carried out for verification and performance evaluation. In the experimental results, this method achieved several millimeters stable accuracy for 40 days measurement.

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  • B-2-28 Open-air Long Time Experiment of Radio Phase Difference Displacement Measurement System

    SUZUKI Nobuhiro, AMISIMA Takeshi, YOSHIZAKI Wataru, OKAMURA Atsushi, NISHIYAMA Satoshi, ONISHI Yuzo

    Proceedings of the IEICE General Conference   2006 ( 1 )   266 - 266   2006.3

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  • 9.Basic Study on Seismic Behavior of Discontinuous Rock Mass

    Hagiwara Ikuo, Sasaki Takeshi, Ohnishi Yuzo, Nishiyama Satoshi, Itoh Hiroshi, Iwata Naoki

    研究発表会講演論文集   18   33 - 36   2006

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  • Study on three-dimensional topographic survey and display system for management of dams

    Nishikawa Keiichi, Nakamura Jinichi, Inoue Tatsuhiro, Ohnishi Yuzo, Nishiyama Satoshi

    JOURNAL OF APPLIED COMPUTING IN CIVIL ENGINEERING   15 ( 0 )   11 - 16   2006

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    In order to recognize the volume and situation of hazard areas soon when natural disasters occur, we have been developing precise digital mapping system for management of the hazards. The management system consist of the three-dimensional precise topographic survey and modeling system. The precise survey system using airplane photogrammetry and GPS has the advantages of precision of 10cm in the vast area of square of 150 km. The coordinates, distances and sectional profiles at arbitrary points can be measured accurately on the three-dimensional display by using the three-dimensional modeling technology. This paper reports the study of application of the system we have developed to management of dams and demonstrates that the system is useful for getting various data for management of dams.

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  • 502 A Study on Estimating Hydraulic Characteristic of Rock Specimens Using Elastic Wave

    MIYATA Ayumi, OHNISHI Yuzo, NISHIYAMA Satoshi, TAKAHASHI Manabu, OKUMURA Hirohumi

    学術講演会講演論文集   55   121 - 122   2006

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  • 501 A Study on the Prediction of Hazard Area due to Rock Slope Failure by using Neural Network System

    KANAMOTO Taketo, OHNISHI Yuzo, NISHIYAMA Satoshi, KUWANO Takeshi, KAWAKITA Minoru, SASAKI Yasuhito

    学術講演会講演論文集   55   119 - 120   2006

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  • Permeable Pavements for Control of Flood and Heat Island Phenomenon(Theme : Geotechnical Challenges in Urban Area-Disaster Prevention and Environmental Problems-)

    Nishiyama Satoshi, Onishi Yuzo, Yano Takao, Wada Minoru

    土と基礎   53 ( 9 )   24 - 26   2005.9

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    The ground surfaces covered by conventional asphalt pavements prevent rainfall from infiltrating into ground. The impervious surface structures do not cause flood flow by an increase of rainfall outflow into rivers and sewers, but also make urban heat environments worse by a decrease of latent heat. A permeable pavement, which has the ability to re-naturalize urban water balance, has been expected to improve the urban thermal and water environments. This study reports the effects of permeable pavements on control of flood flow and heat island phenomenon by experimental evaluation using a permeable pavement model.

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  • 416 Study on maintenance of water circulation for the improvement of city environment

    KITAYAMA Michiya, OHNISHI Yuzo, NISHIYAMA Satoshi, UEHARA Shin-ichi, YANO Takao, WADA Minoru

    学術講演会講演論文集   54   129 - 130   2005

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  • 65. Collapse Analysis of Rock Slope, Using DDA Method

    Hagiwara Ikuo, Sasaki Takeshi, Sasaki Katsuji, Horikawa Shigeo, Nishiyama Satoshi, Ohnishi Yuzo

    研究発表会講演論文集   17   225 - 228   2005

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  • 411 Study on Application of Neural Network to Evaluation of Geological Condition using Drilling Survey System

    KANAMOTO Taketo, OHNISHI Yuzo, NISHIYAMA Satoshi, UEHARA Shinichi, KIMURA Tetsu, YAMASHITA Masayuki

    学術講演会講演論文集   54   119 - 120   2005

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  • P37. Application of Precise Photogrammetry to Observation of Stone Walls

    Moriyama Tetsuro, Hagiwara Ikuo, Nishiyama Satoshi, Yano Takao, Ohnishi Yuzo

    研究発表会講演論文集   17   387 - 390   2005

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  • 418 A Study of Measuring Displacement System by Precise Photogrammetry Using Feature Points on the Bedrock Slope

    TERAKAWA Masashi, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, HASEGAWA Hiroyuki

    学術講演会講演論文集   54   133 - 134   2005

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  • 412 Finite Element Method for slope stability evaluation against rainfall

    TACHIBANA Shoko, OHNISHI Yuzo, NISHIYAMA Satoshi, TAKAHASHI Kenji

    学術講演会講演論文集   54   121 - 122   2005

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  • 417 Hydrological research of ground water for controlling flood in cites

    TAMBARA Koji, OHNISHI Yuzo, NISHIYAMA Satoshi, YANO Takao, SODA Satoshi, KOBAYASHI Hidehiko

    学術講演会講演論文集   54   131 - 132   2005

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  • Simulation of the mechanical behavior of inclined jointed rock masses during tunnel construction using Discontinuous Deformation Analysis (DDA)

    JH Wu, Y Ohnishi, S Nishiyama

    INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES   41 ( 5 )   731 - 743   2004.7

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    In this paper, the mechanical behavior of inclined jointed rock masses during tunneling is considered. Such rock masses can be considered as an assembly of discrete blocks with the discontinuities having a significant influence on the mechanical behavior. To simulate this situation, a discrete numerical analysis method, Discontinuous Deformation Analysis (DDA), is applied. The DDA results show the existence of stress arching in the rock masses during tunneling. This stress arching is the primary influence on the stress distribution and surface subsidence. In addition, the stress arching is affected by the dip angle of the jointed rock masses. Moreover, the DDA results are in good agreement with experiments, explaining the reason for the asymmetrical vertical stress and surface subsidence obtained in laboratory tests. These results suggest that DDA can be applied to model the tunneling behavior of complicated discontinuous rock masses. (C) 2004 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.ijrmms.2004.01.010

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  • Development of generating K-field using frequency dependent acoustic wave velocity and apply in-situ data

    ANDO Kenichi, KIM Hyung-Mok, NISHIYAMA Satoshi, OTANI Shunsuke, KIKUCHI Takashi, OKUBO Shuichi, YOSHIMURA Kimitaka

    物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference   110   149 - 152   2004.5

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  • Study on the measurement method of permeable characteristics of a rock sample using elastic wave dispersion

    NISHIYAMA Satoshi, OHNISHI Yuzo, YANO Takao, YOSHIMURA Kimitaka, OKUBO Shuichi, ANDOH Kenichi, TSUCHIYA Terumitsu

    物理探査学会学術講演会講演論文集 = Proceeding of the SEGJ Conference   110   153 - 154   2004.5

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  • Study of evaporation and heat transfer at permeable pavement

    Tambara Koji, Ohnishi Yuzo, Nishiyama Satoshi, Yano Takao

    Proceedings of the Japan National Conference on Geotechnical Engineering   39 ( 0 )   2363 - 2364   2004

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    現在にいたるまでの高度成長を背景に、都市部を中心に道路網が整備され、以前には表面が土や森林に覆われていた土地が、現在ではさらにアスファルトの舗装に覆われているケースが少なくない。この人工的な被覆面がヒートアイランド現象の原因の一つとして問題視されている。&lt;br&gt;本研究では透水性舗装が都市の環境改善にどのように効果があるかをみるために、透水性舗装からの蒸発に注目し、これを計測する手法の検証を行なったあと、水分を含んだ透水性舗装が、水分が無く乾燥した状態の舗装と比較してどの程度温度が低くなるかを室内実験で検証する。

    DOI: 10.11512/jiban.JGS39.0.2363.0

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  • Experimental study on transmissivity of a single rock joint under shear deformation

    saito ryohei, Ohnishi Yuzo, nisiyama satosi, yano takao, chiba syuuhei, aoki kennitirou

    Proceedings of the Japan National Conference on Geotechnical Engineering   39 ( 0 )   1247 - 1248   2004

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    本研究では,応力が作用した際の岩盤単一不連続面の透水特性とその変化の解明を目的とし,垂直応力一定透水試験および垂直応力一定せん断透水試験を行った.これらの透水試験によって得られたデータから,(1)不連続面の表面凹凸形状,(2)不連続面に作用する垂直応力が透水特性に与える影響を整理した.また,透水量係数と力学的開口幅の関係について検討し,不連続面内のミクロな構造が不連続面のマクロな透水特性に大きく影響を与えることを示した.さらに,垂直応力一定せん断トレーサー試験を行い,せん断に伴う不連続面内の流速の変化を考察し,せん断変位の増加とともにチャンネリングが発達することを示した.

    DOI: 10.11512/jiban.JGS39.0.1247.0

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  • The study on estimating the distribution of rock permeability using elastic wave tomography

    Kikuchi Takashi, Ohnishi Yuzo, Nishiyama Satoshi, Yano Takao, Yoshimura Kimitaka

    Proceedings of the Japan National Conference on Geotechnical Engineering   39 ( 0 )   1253 - 1254   2004

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    本研究は、多孔質弾性論による弾性波速度と周波数の関係より導かれる分散周波数と透水係数の関係式を用いて、花崗岩により構成される岩盤に対する直接的な透水性分布評価手法の確立を目的としている。この関係式中に現れる弾性波透過方向に直交する方向への流体の平均移動距離を表わすパラメータは亀裂の平均開口幅に関係するということを室内試験により示し、関係式からそのパラメータの決定方法を確立することにより、周波数を制御した弾性波測定による透水性分布評価手法を確立した。そして最後にその透水性分布評価手法の現場への適用について実際の現場をモデルに用いて検討を行った。

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  • The study of the three dimensional Discontinuous Deformation Analysis for rockfall simulation

    Fukawa Tetsuya, Ohnishi Yuzou, Nishiyama Satoshi, yang meng, Miki Shigeru

    Proceedings of the Japan National Conference on Geotechnical Engineering   39 ( 0 )   2167 - 2168   2004

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    不連続変形法(DDA)を落石挙動のシミュレーションに適用するにあたり,剛体球を導入することにより,落石の三次元挙動の解析を可能にするコード開発を行ってきた.剛体球要素を導入することにより,ブロック同士の接触判定を簡略化することが可能となる.本手法を落石解析に適用するにあたり衝突時のエネルギー損失をモデル化する必要があり,速度エネルギー比と呼ばれるパラメータを用いて衝突時のエネルギー損失を評価することを可能とした.本論文では,DDAの三次元化のための数値解析法,三次元DDAを落石解析に適用するための手法,及び落石現象への適用性について述べる.

    DOI: 10.11512/jiban.JGS39.0.2167.0

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  • The study of the maintenance management model of the tunnel structure using stochastic process

    Sakai Ryosuke, Ohnishi Yuzo, Ohtsu Hiroyasu, Nishiyama Satoshi, Yasuda Toru

    Proceedings of the Japan National Conference on Geotechnical Engineering   39 ( 0 )   1711 - 1712   2004

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    Publisher:The Japanese Geotechnical Society  

    土木構造物の老朽化に伴い維持管理費が急増する傾向にある現在,効果的アセットマネジメント技術の導入が急務となっている.トンネルにおける維持管理手法は点検・調査を基本として現況の健全性を診断し,必要な対策を選定するというものであるが,適切な対策時期の決定法は未だ研究途上にある.本研究では覆工のひび割れによる性能のジャンプダウンの表現に適しているポアソン過程を用いることで確率的に表現するモデルに改良している.そして,点検間隔および修繕を行う臨界健全度によって,補修のタイミング・優先順位等を制御する意思決定モデルを構築する手法を提案するとともに,実際のトンネルに適用した結果について述べるものである.

    DOI: 10.11512/jiban.JGS39.0.1711.0

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  • 424 穿孔探査法の軟弱地山への適用(地盤力学特性の実験的評価)(材料力学物性の実験的・数値的評価)(オーガナイスドセッション4)

    木村 哲, 山下 雅之, 大西 有三, 西山 哲

    学術講演会講演論文集   52   353 - 354   2003

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  • Development of Monitoring Method for Road Maintenance by Digital Photogrammetry

    Nakai Takumi, Onishi Yuzo, Otsu Hiroyasu, Nishiyama Satoshi, Inoue Akihiro, Miyamoto Tsuyoshi, Ryu Meiji

    Proceedings of the Japan National Conference on Geotechnical Engineering   38 ( 0 )   83 - 84   2003

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    道路法面のモニタリング技術として、デジタル精密写真測量による3次元地盤視覚化技術を開発した。デジタル精密写真測量は、300枚以上の反射ターゲットを市販デジタルカメラで任意の位置から数十枚撮影し、バンドル調整計算を行うことによって、ターゲットの3次元座標を求めることができる。現行の道路法面点検作業に本技術を組み込むことにより、目視点検の代替としてより客観的データを提供できる上に、重点監視対象法面等に対しては、広範囲で詳細な3次元変位を取得し、変位を視覚化することが可能である。論文では、道路法面のメンテナンスの段階を3段階に分けて、要求される精度と評価の手法について比較研究した結果をまとめた。

    DOI: 10.11512/jiban.JGS38.0.83.0

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  • Study on Stability of retaining wall of mansonry type by using Discontinuous Deformation Analysis (DDA)

    Nishiyama Satoshi, Ohnishi Yuzo, Ohtsu Hiroyasu, Nishimura Hirofumi, Yanagawa Toshiaki, Kamemura Katsumi, Seki Fumio, Iketani Seiji

    Proceedings of the Japan National Conference on Geotechnical Engineering   38 ( 0 )   1631 - 1632   2003

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    石積み擁壁の安定性を不連続変形法(DDA)を用いて解析し,安定な構造となるためのメカニズムおよび盛土荷重に対する耐力や地震時での挙動を考察するためのデータを提供する.本研究は,特に空積み工法によって築かれた石積み擁壁を対象にし,従来の解析手法による安定性解析の困難さを示すと共に,当困難を克服するために開発された不連続変形法を紹介し,さらに当擁壁の各種地盤条件下ので安定性や地震時の挙動に関する解析結果を報告する.これにより,景観と環境に配慮し,人と地球の共生を図るための構造物としての石積み擁壁について考察する.

    DOI: 10.11512/jiban.JGS38.0.1631.0

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  • A STUDY OF MOMITORING METHOD FOR TUNNEL WITH TRAFFIC USING PHOTOGRAMMETRY SYSTEM

    NAKAI Takumi, RYU Meiji, OHNISHI Yuzo, OHTSU Hiroyasu, NISHIYAMAN Satoshi, TOGAWA Naomasa, ISHIDA Hidenari, HIROTA Mitsuhide, MIYAMOTO Tsuyoshi

    Journal of Construction Management, JSCE   10   111 - 118   2003

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    Publisher:Japan Society of Civil Engineers  

    In these days, as a method of evaluating synthetically the expense and the cost of the construction, the maintenance, repair, and renewal of an engineering-works road structure. From which the concept of assets management (infrastructure valuation of assets and management) has come to attract attention, in order to cope with a subject called optimization of the maintenance, repair, and renewal of a road engineering-works from now on.&lt;BR&gt;In order to build such a system, the monitoring of the performance of a road structure and a functional level are required. The precision photogrammetry technique was used and it was shown that the efficient monitoring of a road structure is possible. Moreover, in the tunnel with traffic, the actual proof experiment was conducted and it checked actually functioning.

    DOI: 10.2208/procm.10.111

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  • General report on rock mass failure and rock fall problems

    OHNISHI Yuzo, NISHIYAMA Satoshi

    Landslides   39 ( 1 )   1 - 13   2002.6

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    Rock mass failure and rock fall problems have been investigated for a long time, but the definite and acceptable solution is not given yet. This general report summarizes the recent researches and investigations (mainly in Japan) in relation to this topic. New technologies, measurement systems, observation, numerical methods and latest concepts for reduction of damage from rock failure are presented. The future works to be accomplished are carefully described.

    DOI: 10.3313/jls1964.39.1

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  • Slope Failure Simulation by Three-Dimensional Discontinuous Deformation Analysis (3D DDA)

    WU Jian-Hong, NISHIYAMA Satoshi, OHNISHI Yuzo

    7 ( 2 )   427 - 430   2002.5

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  • The 2^<nd> Asia Rock Mechanics Symposiumに参加して

    西山 哲

    材料   51 ( 4 )   481 - 481   2002.4

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  • 立坑の変位計側のための最適な写真測量技術

    木山 保, 山本 陽一, 大西 有三, 西山 哲

    春季大会講演集. I, 資源編   14 ( 1 )   98 - 99   2002.3

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  • 精密写真測量による斜面崩壊モニタリングシステムの研究

    西山哲

    第11回岩の力学国内シンポジウム, 2002   2002

  • 岩盤崩壊メカニズムについて (小特集 災害とその後の技術)

    大西 有三, 西山 哲

    地質と調査   2002 ( 3 )   9 - 15   2002

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  • Applicability of random walk method to dissolved gas migration for CO2 isolation

    Ohtani Shunsuke, Ando Kenichi, Kurikami Hiroshi, Nishiyama Satoshi, Ohnishi Yuzo

    Proceedings of the Japan National Conference on Geotechnical Engineering   37 ( 0 )   1271 - 1272   2002

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  • Rigid Body Rotation Problem to the Contact in Discontinuous Deformation Analysis (DDA) and its Application to Rock Fall

    Wu Jian-Hong, Ohnishi Yuzo, Nishiyama Satoshi

    Proceedings of the Japan National Conference on Geotechnical Engineering   37 ( 0 )   2265 - 2266   2002

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  • 写真測量を利用した高精度3次元変位測定法の開発と岩石圧縮試験への応用

    西山 哲, 大西 有三, 大津 宏康, 矢野 隆夫, 高橋 学

    一般発表(研究・業績発表)講演要旨集   2001 ( 1 )   227 - 228   2001.3

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  • 立坑掘削にともなう変位計測のための写真測量技術の開発

    木山 保, 山田 惇人, 重盛 剛彦, 大西 有三, 西山 哲

    一般発表(研究・業績発表)講演要旨集   2001 ( 1 )   229 - 230   2001.3

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  • Development of tunnel measurement system using photogrammetry.

    堀場夏峰, 秋山演亮, 木村哲, 秋本圭一, 西山哲, 大西有三

    岩の力学国内シンポジウム講演論文集   11th ( Pt.2 )   2001

  • 岩盤斜面崩壊対策としてのリアルタイムモニタリング技術 (小特集 防災におけるリアルタイムモニタリング技術)

    大西 有三, 西山 哲

    地質と調査   2000 ( 2 )   22 - 27   2000.6

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  • Planar-channel coupled model for fluid flow in discrete fracture network

    Proceedings of the International Workslop on Migration of Contaminants and Fraduved Media   79 - 87   2000

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  • Experimental Study of Hydraulic Conductivity and Hydraulic Gradient in Rock Specimen

    TAKAHASHI Manabu, ZHANG Ming, LIN Weiren, NISHIYAMA Satoshi, LI Xiaochun

    Journal of Japanese Association of Hydrological Sciences   29 ( 4 )   205 - 214   1999.11

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  • 静水圧及び時間依存性を考慮した変位計のキャリブレーションと砂岩の変形について

    高橋 学, 李 小春, 林 為人, 西山 哲, 小松原 琢

    一般発表(研究・業績発表)講演要旨集   1999 ( 1 )   171 - 172   1999.3

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  • Application of Photogrammetry on Rock Displacement Measurement

    The 8th International Underground Space Conference   ( 99 )   420 - 428   1999

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  • Hydraulic Head, Hydraulic Gradient and Storage Coefficient within Specimen during Laboratory Permeability Tests

    TAKAHASHI Manabu, ZHANG Ming, LIN Weiren, NISHIYAMA Satoshi, LI Xiaochun

    Shigen-to-Sozai   114 ( 12 )   888 - 894   1998.11

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    Language:Japanese   Publisher:The Mining and Materials Processing Institute of Japan  

    The fundamental governing equation for the transient flow in homogeneous and isotropic poroelasticity has been used to obtain the permeability and storage coefficient of specimen under axi-symmetric triaxial stress state. Rigorous analytical solutions of Constant Head, Falling Head, Transient Pulse and Constant Flow Pump Tests are presented. They were also adopted to compare the distributions of hydraulic head and hydraulic gradient within the specimen among the four permeability tests. It was found that the time-dependent variations of hydraulic head and hydraulic gradient within specimen are rather complicated. Three dimensional storage coefficient (S&#039;) of homogeneous porous media is greater than the specific storage (S). Special attention should be paid when estimating the storage coefficients because different storage coefficients are defined by different boundary conditions based on the poroelasticity.

    DOI: 10.2473/shigentosozai.114.888

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Presentations

  • ICRT技術を活用した高精度かつ効率的な斜面・法面点検の開発 ー建設DX時代における道路斜面防災・減災の在り方を考えるー Invited

    西山哲, 冨井隆春, 菊地輝行, 藤本次昭

    新都市社会技術融合創造研究会 (国土交通省近畿地方整備局近畿技術事務所主催)  2021.12.6 

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  • 国土強靭化とインフラDX Invited

    西山 哲

    建設技術フォーラム in 中国  2021.11.18 

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  • また来る水害に備えるには Invited

    西山 哲

    令和3年度政令指定都市主管課長会議  2021.10.8 

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  • 建設業におけるDXの活用法を考える Invited

    西山 哲

    全日本建設技術協会 岡山県協会技術講習会  2021.7.30 

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  • 紡ぐ記憶―晴れの国から未来へ送るメッセージ Invited

    伊原木隆太, 岡山県知事, 多田智, 国土交通省中国地方整備局長, 金藤純子, EnPal代表取締役, 西山哲, 岡山大大学院環境生命科学研究科教授

    山陽新聞社 西日本豪雨災害3周年 復興支援シンポジウム  2021.7.22 

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  • ICTを活用した河川・港湾維持管理システム の展望 -i-Construction, CIMの維持管理への活用- Invited

    五十嵐善一, 株式会社パスコ(土木情報学委員会河川, 港湾維持管理システム研究小委員会小委員長, 西山 哲, 岡山大学大学院環境生命科学研究科, 萩原修身, 株式会社日立ソリューションズ, 宮田 岩往, 株式会社奥村組, 間野 耕司, 株式会社パスコ, 新田 耕司, 中央復建コンサルタンツ株式会社, 中村 圭吾, 土木研究所河川生態チーム

    土木学会 全国大会 研究討論会  2020.9.11 

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  • また来る水害に備えるには Invited

    西山哲

    岡山県令和2年度自主防災組織設立等支援事業セミナー  2019.12.15 

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    Event date: 2019.12.15

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  • また来る災害に備える Invited

    西山 哲

    平成30年度備前県民局防災研修会  2019.3.7 

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  • 国土強靭化策によって実用化される斜面防災DX技術の紹介 Invited

    西山 哲

    新建新聞社主催 建設ミライセミナー斜面防災編  2022.8.30 

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  • 防災 、減災 から “避災工学 ”へ Invited

    西山 哲

    日本技術士会中国支部建設部会・定期講演  2018.11.23 

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  • 地質調査業における“第4次産業革命”~ICTとIRTが変える地質調査業の姿~ Invited

    西山 哲

    地質調査業協会岡山県支部50周年記念講演  2018.6.5 

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  • 岡山県赤磐市をモデルとした『自動運転システムによる高精度3次元地図』を活用した点検手法 Invited

    西山 哲

    2018.3.15 

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  • 防災意識向上セミナー 「瀬戸内の風水害」 Invited

    西山 哲

    岡山県備前県民局主催  2018.3.11 

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  • 社会資本の維持管理・更新戦略のためのICT技術の紹介 Invited

    西山 哲

    中国地方建設技術開発交流会  2017.11.1 

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  • 第4次産業革命に向けた技術者教育の改革 Invited

    西山 哲

    全国情報技術教育研究会  2017.8.3 

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Works

  • 斜面崩壊監視システムの構築

    2000

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  • Development of Measurement System of Displacement using Precies Photgrammetry

    2000

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  • 精密写真測量による高精度変位計測システムの開発

    2000

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  • Development of Monitoring System of Slope Stability

    2000

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Awards

  • 論文賞

    2023.6   公益社団法人 地盤工学会   トンネル施工時の湧水量の予測手法の拡張と実トンネルへの適用

    久保田恭行,森守正,安田享,小山倫史,西山哲

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  • AI・データサイエンス奨励賞

    2022.12   公益社団法人 土木学会 構造工学委員会   Drone-LiDAR-assisted Image Fusion methodology for Deep Learning-based Land Cover Classification

    Shijun PAN, Keisuke YOSHIDA, Takashi KOJIMA, Satoshi NISHIYAMA

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  • 第5回インフラメンテナンス大賞 優秀賞

    2021.12   国土交通省   産官学で取り組む『岡山道路パトロール隊』

    狩屋 岡山工業高校, 平手 日本非破壊検査工業会, 西山 岡山大学学術研究院, 岡本 国土交通省岡山国道事務, 柳川 日本道路, 小井住 NIPPO

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  • 論文賞

    2020.6   日本情報地質学会   航空レーザ計測データを用いた地すべり・崩壊斜面における地形判読と地形変状規模の定量化

    菊地 輝行・﨑田 晃基・秦野 輝儀・西山 哲

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  • 土木情報学システム開発賞

    2019.9   土木学会土木情報学委員会   微地形強調図とタブレット型 GIS を用いた落石調査手法

    吉川 慶(株式会社ウエスコ),宮下征士(株式会社ウエスコ),濱田展寿(株式会社ウエスコ),崎田晃基(岡山大学),西山 哲(岡山大学)

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  • papaer promotion award

    2018.7   Japan association of surveyors  

    Nishiyama Satoshi

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  • paper award

    2018.6   Japan Society of Engineering Geology.   Development of Analytic Method for Landslide Measurement by Movement Vectors

    Nishiyama Satoshi

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  • Paper award

    2017.8  

    Nishiyama Satoshi

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  • Paper promotion award

    2015.6   Japan association of surveyors  

    Nishiyama Satoshi

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Research Projects

  • Research on technology to measure the condition of a wide range of river embankments and river beds in three dimensions in real time and with high accuracy

    Grant number:22K04653  2022.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    西山 哲

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

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  • Study on measurement technology to detect river bank and subsurface deformation simultaneously, accurately, and at low cost

    Grant number:19K04949  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    nishiyama satoshi

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    1) Realization of mobile laser point group measurement system: A three-dimensional measurement system utilizing SLAM (Simultaneous Localization and Mapping) algorithm has been put into practical use.2) Development of real-time processing technology for 3D data: In combination with the method described in 1), it was demonstrated that laser point group processing software could be constructed to detect the location of deformation of river embankments and river structures in real time. 3) Utilization of green laser that penetrates water and enables measurement of riverbed: We verified the relationship between the water penetration capacity of a green laser with a wavelength of 515 nm and the transparency of rivers, and the water depth is up to about 1.5 times the depth that can be visually confirmed.

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  • Research on high precision taravelling vehicle measurement technology for maintenance of river embankment and river structure

    Grant number:16K01329  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    nishiyama satoshi, mano kouji, tachibana kikuo

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    Due to the lack of human resources and financial problems, further streamlining of inspection work of river embankments and river structures is required. Therefore, it is becoming more important to use ICRT technology to improve maintenance and management levels through preventive maintenance with high efficiency and low cost. Measurement methods using a travelling vehicle with various measurement devices have been expected to be techniques for efficiently checking a wide area, but due to problems such as lack of measurement accuracy and data processing requiring experience,it has not been used. In order to solve this problem, this research aimed to improve the accuracy of the travelling vehicle measurement method equipped with a laser scanner and digital imaging equipment, and put into practice the monitoring technology of river embankments and structures.

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  • A study on ultrasonic attenuation mechanism in crystalline rock core sample

    Grant number:26420459  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Kimoto Kazushi, NISHIYAMA Satoshi

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    In this study, ultrasonic measurements and the signal processing were carried out aiming to understand the elastic wave propagation characteristics in a highly heterogeneous crystalline rock core samples. For the ultrasonic measurements, PZT and laser Doppler vibrometer were used. With the measurement setup, longitudinal (L), shear(S) and Rayleigh surface(R) waves transmitted through a cylindrical granite samples were measured. It was shown as the result, that the granite core behaves as an acoustically orthotropic material which can support a ballistic waves having the frequency components up to 500kHz. Another important finding is that the grain boundaries act as a relatively weak scatterer while strong scattering occurs at more sparsely distributed micro cracks.

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  • Study on three dimensional detection method of river dike deformation with rapid response , wide area and a high accuracy for river disaster prevention

    Grant number:25420501  2013.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    NISHIYAMA SATOSHI

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    Authorship:Principal investigator  Grant type:Competitive

    We have had lots of heavy rains caused by global abnormal weather, and these days the damage of the flood by river dike collapse has occurred frequently. However, inspection works for maintenance of river dike depends on visual inspection by experts, and only qualitative observation has carried out for river dike maintenance.In this study, we developed measurement method using vehicle equipped with a laser scanner apparatus. This measurement method can monitor the river dike of wide area in real time with three dimension and a high accuracy, and it has an advantage that we can perform the monitoring work without human efforts and time consuming. We completed the monitoring technique to grasp exactly before and after a disaster where and how the river dike is dangerous by using the vehicle measurement method.

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  • Study on real-time disaster prevention system using wide-area sensor network

    Grant number:22560494  2010.04 - 2012.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    NISHIYAMA Satoshi, MIURA Satoru, KOYAMA Tomoyumi, KUROMUMA Izuru

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    Authorship:Principal investigator  Grant type:Competitive

    We developed the ubiquitos sensor network system that we can monitor a dangerous slope anytime anywhere in order to evaluate the stability of the slope and consider measures to prevent collapse of the slope and minimize damage.

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  • Development of Real-time Monitoring System for Extensive Slope Hazards

    Grant number:20360234  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    KURONUMA Izuru, MIURA Satoru, OHNISHI Yuzo, NISHIYAMA Satoshi, HATTORI Susumu

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    Grant amount:\18200000 ( Direct expense: \14000000 、 Indirect expense:\4200000 )

    In order to prevent slope hazards, such as landslides frequently occur in Japan, simple, inexpensive and real-time monitoring method is required to detect extensive slope displacement. In this study, we improve and integrate GPS, digital photogrammetry and on-board laser scanners technologies, and obtain a prospect of building practical monitoring system.

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  • Study on Real-time Monitoring Method for Extensive Slope Hazards

    Grant number:17360225  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    OHNISHI Yuzo, NISHIYAMA Satoshi, UEHARA Shinichi

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    Grant amount:\17080000 ( Direct expense: \15700000 、 Indirect expense:\1380000 )

    Despite the fact that many disasters have actually occurred in relation to slope failure in Japan, there are very few research and measurement case studies on the phenomenon of slope failure. Particularly in the case of rock, because the time between the appearance of a signal symptom and the occurrence of failure is short unlike in the case of landsliding, the technology to output precise real-time data on displacements/deformations is required. The following technological features are also often required for the monitoring of rock failure:
    - To allow remote measurements
    - To allow the extensive area-wide tracking of deformations
    - To be able to save the measurement cost.
    To prevent an enormous social loss that could be incurred by slope failure, it is crucial to develop a measurement technology that satisfies the above requirements, allowing the identification of failure-prone locations and quantitative evaluation of the failure risk. Given these situations, this study attempts to develop a slope monitoring technology using the radio wave, which estimates the position of the transmitter at a reference point from the phase difference of the signals received by four or more sensors and the photogrammetric technique, which measures the photographic subject's deformation by using digital camera images. The proposed system requires only simple, small and light-weight equipment on each reference point, and this measurement system has high accuracy and precision. This paper reports on a study to develop a highly reliable disaster prevention method that serves as a slope failure measure that helps to identify, inspect and strengthen the management of risky locations based on precise monitoring systems using radio wave and photogrammetric technique.

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  • A study on deformation monitoring techniques by vision metrology

    Grant number:16360259  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    MIURA Satoru, KURONUMA Izuru, IMAI Michio, OHNISHI Yuzo, NISHIYAMA Satoshi

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    Grant amount:\12400000 ( Direct expense: \12400000 )

    Purpose of this study was developing a method of measuring and monitoring techniques for slope deformation caused by landslides with vision metrology using a digital camera. Vision metrology using digital cameras has been used for accurately measuring the configurations of large industrial products such as ships, aircraft and automobiles. This study refers to the application of this technique to measurement and monitoring of slope deformation structures. Vision metrology is nearly established, but its use in civil and environment engineering requires solution of numerous problems.
    The results of this study are summarized as follows ;
    (1) Establishing a measuring theory and proposing a monitoring technique for slope deformations, and developing a camera calibration procedure.
    (2) Estimating an applicability of vision metrology for monitoring of slope deformations and abstracting problems caused by measurement conditions.
    (3) Proposition a measuring procedure for unsatisfactory measuring conditions that did not require absolute coordinates of targets by setting known points to be only a few stationary points
    Finally we investigate precision and sensitivity of slope deformation measurement using vision metrology in a construction site. Target deformation was detected by measurement with two time epochs using hypothetical testing, and a series of equations is derived for the detection. Assuming that targets were installed on the slope with standard interval lm, photo-taking conditions where 2 mm displacement could be detected at 30 m were investigated. As a result, a total of 12 photos or four photos taken at each of three locations were evaluated to be the best in terms of measurement precision, sensitivity of displacement detection and reliability. It is thus clarified that sufficient precision, sensitivity and reliability are achievable for practical use.

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  • 透水性舗装のヒートアイランド抑制効果検証用ナノ薄膜蒸発量センサの開発

    Grant number:16656142  2004 - 2005

    日本学術振興会  科学研究費助成事業 萌芽研究  萌芽研究

    大西 有三, 西山 哲, 上原 真一

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    Grant amount:\3400000 ( Direct expense: \3400000 )

    本研究は道路舗装面を透水性のものにすることで,都市における生活の快適性の機能を保ちつつも熱環境の改善と一体となった水環境の保全を実施する方策としての透水性舗装に関する研究を遂行するに当たり,その機能設計あるいは施工後の機能効果確認および機能保持のための維持管理を行うために必要な蒸発量をモニタリングするナノ薄膜を利用したマイクロセンサの開発を試みたものである.本年度は,蒸発量センサの製作を主とする研究開発を行った.主な研究開発項目はMgCr2O4-TiO2系セラミックスの焼結体を用いた高周波プラズマスパッタリング法による薄膜作成の試行であった.具体的には高周波プラズマスパッタリングによる薄膜作成によって,直径100mm,厚み5mm以下のセンサを作成した.蒸発量センシング機能の定量評価は,重量変化により水の蒸発量を計測する装置を組み立て,それをセンサによりモニタリングすることで行った.センサの蒸発量は電圧信号で検知でき,この評価実験用として電圧計を用いた.
    また,作成した蒸発量センサの透水性舗装への適用を主とする研究開発を行った.主な研究開発項目として,センサを透水性舗装表層に埋め込み,最表層の温度センサと蒸発量の定量的関係を計測した.これにより,透水性舗装のヒートアイランド効果への効用を評価することが可能となった.実験は実際に施工されている透水性舗装の箇所を使用して行った.蒸発による舗装面の温度低下の確認は熱電対と赤外線放射計によって計測した.計測にあたってはパーソナルコンピュータとデータロガーを用いた計測システムを構築してデータ収集し,蒸発量と舗装体温度の関係についての考察を行った.

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  • A Study on Urban Groundwater Environment in Southeast Asian Countries

    Grant number:14404003  2002 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    OHTSU Hiroyasu, OHNISHI Yuzo, NISHIYAMA Satoshi, YASUDA Tooru, LEE Keita

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    Grant amount:\11400000 ( Direct expense: \11400000 )

    In this study, the following research works were conducted:
    ・Data collection and/or analysis associated with the impact of groundwater extraction on urban groundwater Environment in Hanoi, Vietnam
    ・Establishment of simulation modeling on groundwater behavior due to groundwater extraction in Great Bangkok areas, Thailand
    First, in order to collect data on results of groundwater monitoring and investigate current situation of groundwater Environment in Hanoi, our research group has held workshop in Hanoi together with Vietnamese researchers and engineers. As a result of investigation, the following findings were obtained:
    ・Little decrease of pore water pressure in aquifers due to groundwater extraction is observed, because the amount of Groundwater usage currently balances with water supply from surrounding rivers.
    Secondly, prediction of groundwater behavior and related land subsidence due to groundwater extraction in Great Bangkok area was conducted. Results showed that the control measures on groundwater pumping issued by Bangkok Metropolitan Office effectively helped to decrease the rate of subsidence in central area of Bangkok. However, it was predicted that additional land subsidence in surroundings areas amounts to 0.5m-1.0m, though the rate of subsidence decreases. In addition, the sensitivity analysis of uncertain factors involved in evaluation of land subsidence made it clear that clay contents involved in Bangkok aquifers are dominant one.
    Furthermore, flood risk analysis against settlement of dyke along Chao Phraya river, which flows through Great Bangkok area, was conducted. In detail, exceedanee probability of land subsidence to allowable settlement was selected as index to investigate flood risk. Finally, following findings were obtained:
    ・Flood risk along Chao Phraya river varies from place to place because of subsoil profile and location of pumping wells.
    ・Uncertainly associated with clay contents involved in Bangkok aquifers is dominant risk factors against flood.

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  • セルオートマトンを利用した地球温暖化防止のためのCO_2深部岩盤貯留技術の研究

    Grant number:14655172  2002 - 2003

    日本学術振興会  科学研究費助成事業 萌芽研究  萌芽研究

    大西 有三, 西山 哲, 大津 宏康

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    Grant amount:\3200000 ( Direct expense: \3200000 )

    本研究における研究実績は次の通り要約される.
    1.格子ガスオートマトン法による浸透流・地下水移行問題解析のためのプログラム開発
    2.上記手法の亀裂ネットワークモデルへの適用による浸透流・地下水移行問題解析プログラムの開発
    具体的には次の通り.
    (1)セルオートマトン法は,自然の複雑性を人の手を介せずに再現させる手法であり,その際,必ずしも複雑な現象のレベルにおける情報や知識を必要としない.従って,セルオートマトン法は既に複雑系の中でも生命現象の解明にすぐれた業績を残しているが,岩盤中の浸透流の解析への適用例は無いので,単一亀裂中の水理挙動のシミュレーション結果の評価により,開発手法の妥当性を検証した.
    (2)格子ガスオートマトン法は,対象を正多角形で敷き詰めた格子に分割し,単位質量の粒子を格子線上に移動させていく手法である.その後,粒子の移動,衝突および散乱を表現するために,隣り合う格子点の粒子の衝突過程を,質量と運動量を保存するように単純に繰り返していく.この手法の応用によって,亀裂ネットワーク中の水理挙動のシミュレーション技術を構築した.なお,本研究では岩盤の亀裂ネットワークモデルも自己組織化の原理によって構成することを試み,次にその亀裂を流れる流体を不連続な集まりで捉え,単純なレベルの衝突で時系列的に追跡していく格子ガスオートマトン法を用いて浸透流と物質移行を解析するという手法によって解析する手法を開発した.
    本研究によって,岩盤中の帯水層に溶解したCO_2の水理挙動の時間・空間的なパターンにおける不規則性を,不規則なままで解析するという新たな解析法を構築することを実現した.

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  • Measurement and Evaluation System of Permeabilities of Rock Sample and a Rock Mass by Using Heterodyne Frequency, Transformation

    Grant number:13450193  2001 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    OHNISHI Yuzo, NISHIYAMA Satoshi, OHTSU Hiroyasu

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    Grant amount:\6100000 ( Direct expense: \6100000 )

    A purpose of this study is to establish the measurement method of permeabilities of rock samples and in-site rock masses. Permeability is one of the important characteristics of rock masses in order to grasp and predict the behaviors of the rock masses. In this study, the next contents were examined.
    1) Study on measurement and consideration the relationship physical and hydraulic properties of rock in a shearing test of the rock.
    2) Study on measurement method of permeabilities of a crystalline structure rock masses.
    Results of the study are as follows.
    1) We made clear the relationship of mechanical and hydraulic properties of discontinuous rock samples under shear stresses.
    2) We pointed out the possibility that a characteristic of in-site rock masses could be measured by the next contents.
    We produced the seismic sources that could control the frequencies of the waves that do not damp to a distance place.
    We examined a theory to relate permeability of rocks to frequency characteristics of the waves that pass through the rocks.
    We use the seismic sources and examined the method to measure permeabilities of rock masses having low coefficient from dispersion curves of the waves by applying heterodyne techniques.

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  • Development of a Digital Photogrammetric System for Monitoring Rock Failure and Disaster Prevention

    Grant number:12555142  2000 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    OHNISHI Yuzo, ONO Tetsu, NISHIYAMA Satoshi, OHTSU Hiroyasu

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    Grant amount:\11900000 ( Direct expense: \11900000 )

    Developments in a digital photogrammetry have produced a precise measuring tool in production of rock structures. This paper shows the applicability of photogrammetric techniques for the monitoring of displacements in rock slopes. A pilot study and experiment have been conducted to quantitatively examine the accuracies, and we obtained the results of photogrammetric investigation as follows.
    We made the photogrammetric theory by which we could measure the three dimensional displacements of rock slopes. The advantages of the theory are real time and high accurate measurements of deformation of rock slope by using digital cameras that are commercially available.
    We developed targets having the excellent reflective properties for a long term, and completed the automatic measurement system for rock slopes by using the image processing to recognize targets installed on the rock slopes.
    Some experiments demonstrated that this digital photogrammetry offers a practical and economical measurement tool that would yield less than 1mm positioning accuracies over large areas.
    These results of this study suggest that this measurement system is useful to prevent disasters by monitoring the behaviors of rock slopes accurately, immediately and without human skills.

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  • Development of Analysis method for Discontinuous Rock

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    Grant type:Competitive

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  • 不連続性岩盤の挙動解析手法の開発

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    Grant type:Competitive

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  • Study on Hydraulic Properties of Rock

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    Grant type:Competitive

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  • 画像計測システムの開発

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    Grant type:Competitive

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  • 岩盤の水理特性解明のための研究

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    Grant type:Competitive

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  • Development of Measurement System Using Image Processing

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    Grant type:Competitive

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  • Environmental Issues and Recycling Processes of Resources (2020academic year) 1st semester  - 火7,火8

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Media Coverage

  • ドローングリーンドローンレーザースキャナ新時代 利点活かすマニュアル作り Newspaper, magazine

    建設通信新聞  関西建設ICT特集  2021.10.29

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  • 西日本豪雨3年 復興シンポジウム 紡ぐ記憶―晴れの国から未来へ送るメッセージー Newspaper, magazine

    山陽新聞  社会面  2021.8.22

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  • 西日本豪雨3年 復興シンポジウム 紡ぐ記憶―晴れの国から未来へ送るメッセージー Internet

    山陽新聞社  西日本豪雨3年 復興シンポジウム 紡ぐ記憶―晴れの国から未来へ送るメッセージー  2021.7.20

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  • 洪水危険個所ドローン測量-自治体災害対策へ― Newspaper, magazine

    山陽新聞  社会面  2021.3.3

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