Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
External link
SHIBATA Toshifumi
Degree
Degree
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(BLANK) ( Hokkaido University )
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(BLANK) ( Hokkaido University )
Research Interests
Research Interests
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構造力学
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structural engineering
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数値解析
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地盤工学
Research Areas
Research Areas
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Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Structure engineering and earthquake engineering
Education
Education
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Hokkaido University 工学研究科 社会基盤工学専攻
- 2001
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Country： Japan
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Hokkaido University
- 2001
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Kanazawa University 工学部 土木建設工学科
- 1996
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Country： Japan
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Kanazawa University
- 1996
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Research History
Research History
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Okayama University The Graduate School of Environmental and Life Science
2016.4
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Okayama University The Graduate School of Environmental and Life Science
2013.9 - 2016.3
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National Institute of Technology, Matsue College
2009.4 - 2013.8
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National Institute of Technology, Matsue College
2007.4 - 2009.3
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Northwestern University 研究員
2005.3 - 2005.8
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National Institute of Technology, Matsue College
2001.4 - 2007.3
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Researh Associate, Matsue National College of Technology
2001 - 2003
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Professional Memberships
Professional Memberships
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THE JAPANESE GEOTECHNICAL SOCIETY
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土木学会
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THE JAPANESE SOCIETY OF IRRIGATION, DRAINAGE AND RURAL ENGINEERING
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日本計算工学会
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Committee Memberships
Committee Memberships
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地盤工学会中国支部 岡山地域幹事
2020.4
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Committee type：Academic society
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地盤工学会中国支部 幹事
2020.4
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Committee type：Academic society
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地盤工学会中国支部 事務局長
2020.4 - 2021.3
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Committee type：Academic society
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地盤工学会会誌編集委員会 委員
2019.4
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Committee type：Academic society
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地盤工学会中国支部 岡山地域 防災教育WG 委員
2018.4
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農業農村工学会中国四国支部 事務局幹事
2016.6 - 2018.5
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Committee type：Academic society
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農業農村工学会 学科誌編集委員会専門委員
2016.4 - 2018.3
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Committee type：Academic society
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土木学会応用力学委員会 委員
2015.5
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地盤工学会中国支部 「地盤と建設」編集委員
2015.4 - 2020.3
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Committee type：Academic society
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農業農村工学会材料施工研究部会 事務局
2013.10 - 2014.9
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Committee type：Academic society
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地盤工学会中国支部 岡山地域 河川堤防耐震WG 委員
2013.9
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農業農村工学会材料施工研究部会 幹事
2012.9
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Committee type：Academic society
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土木学会応用力学委員会 逆問題小委員会 委員
2011.4 - 2020.3
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Committee type：Academic society
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土木学会応用力学 ウィキペディア小委員会 幹事
2010.4 - 2016.3
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Committee type：Academic society
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土木学会中国支部 選奨土木遺産選考委員会 委員
2007.4 - 2010.3
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Committee type：Academic society
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土木学会中国支部 幹事
2007.4 - 2010.3
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Committee type：Academic society
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土木学会応用力学委員会 計算力学小委員会委員
2004.4 - 2017.3
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Committee type：Academic society
Papers
Papers
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Quantitative risk assessment for overtopping of earth-fill dams in Japan using machine learning algorithms Reviewed
Shiying Zheng, Shin-ichi Nishimura, Toshifumi Shibata, Yimeng Chen
International Journal of Disaster Risk Reduction 113 104892 - 104892 2024.10
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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV
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Inversion for soil property through data assimilation of Rayleigh wave Reviewed
Yuxiang REN, Shinichi NISHIMURA, Toshifumi SHIBATA, Takayuki SHUKU
Journal of JSCE 12 ( 2 ) 2024
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Language：English Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
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A novel data-driven 3D site characterization method: Tucker decomposition-Bayesian compressive sensing and benchmarking study Reviewed
M. Huang, T. Shuku, T. Shibata, S. Nishimura
ICVRAM-ISUMA 2024 2024
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A novel data-driven 3D site characterisation method: Tucker decomposition-Bayesian compressive sensing and benchmarking study Reviewed
M. Huang, T. Shuku, T. Shibata, S. Nishimura
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards 2024
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Quantitative risk assessment for overflow of earth-fill dam by flooding using machine learning method Reviewed
S. Zheng, S. Nishimura, T. Shibata, T. Shuku
ICVRAM-ISUMA 2024 2024
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Identification of density of earth-fill dam using muography Reviewed
T. Shibata, K. Takahashi, S. Nishimura, T. Shuku
7th International Conference on Geotechnical and Geophysical Site Characterization 2024
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Identification of random field for ground stiffness by data assimilation based on surface wave method and sounding tests Reviewed
S. Nishimura, Y. Ren, T. Shibata, T. Shuku
7th International Conference on Geotechnical and Geophysical Site Characterization 2024
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Effect of Permeability Random Field on Piping Risk of a River Dike3 Reviewed
Shin-ichi NISHIMURA, Go KUBOTA, Ryota OHASHI, Toshifumi SHIBATA, Takayuki SHUKU
Geotechnical Special Publication (GSP), ASCE 347 2023.7
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Publishing type：Research paper (international conference proceedings) Publisher：American Society of Civil Engineers
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RBSMによる塑性圧が作用する農業用水路トンネルの模型実験の解析 Reviewed
田本敏之, 柴田俊文, 西村伸一, 珠玖隆行
農業農村工学会論文集 317 I_239 - I_247 2023
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Risk evaluation for earth-fill dams due to heavy rains by response surface method Reviewed
S. Zheng, S. Nishimura, T. Shuku, T. Shibata, T. Tateishi
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards 17 ( 3 ) 572 - 585 2023
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Evaluation for Earth-Fill Dams by Response Surface Method Reviewed
S. Zheng, S. Nishimura, T. Shibata
8th International Symposium for Geotechnical Safety & Risk 2022.12
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Evaluation of Deformation Behavior of a Natural Slope using Particle Filter Reviewed
T. Shibata, S. Nishimura, T. Shuku
8th International Symposium for Geotechnical Safety & Risk 2022.12
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Data assimilation for surface wave method by ensemble Kalman filter with random field modeling Reviewed
Y. Ren, S. Nishimura, T. Shibata, T. Shuku
International Journal for Numerical and Analytical Methods in Geomechanics 46 ( 15 ) 2944 - 2961 2022
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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley
DOI： 10.1002/nag.3435
Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/nag.3435
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SEISMIC RESPONSE ANALYSIS OF EARTH DAMS WITH GEOSTATISTICAL METHOD AND 3-D SURVEY
Ryota OHASHI, Shin-ichi NISHIMURA, Minoru KANESHIGE, Toshifumi SHIBATA, Takayuki SHUKU
Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 78 ( 2 ) 140 - 152 2022
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Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
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Using the Ensemble Data Assimilation for Stiffness Evaluation of an Embankment Reviewed
Y. Ren, S. Nishimura, T. Shibata, T. Shuku
Proceedings of the 8th International Symposium on Reliability Engineering and Risk Management 419 - 425 2022
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Application of Response Surface Method for Risk Evaluation of Earth-fill Dams Reviewed
S. Nishimura, T. Tateishi, T. Shibata, S. Kuroda, T. Kato, K. Kuribayashi, N. Tanaya
Proceedings of the 8th International Symposium on Reliability Engineering and Risk Management 413 - 418 2022
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Piping Risk Evaluation Considering Permeability Random Field Reviewed
R. Ohashi, G. Kubota, S. Nishimura, T. Shibata, T. Shuku
Proceedings of the 6th International Conference on Materials and Reliability 2022
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Seismic Response Analysis of Earth Dam with Geostatistical Method and 3-D Survey Reviewed
R. Ohashi, S. Nishimura, M, Kaneshige, T. Shibata, and T, Shuku
Challenges and Innovations in Geomechanics - Proceedings of the 16th International Conference of IACMAG 387 - 394 2022
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地質統計手法と三次元計測に基づくため池堤体の地震応答解析 Reviewed
大橋亮太, 西村伸一, 金重稔, 柴田俊文, 珠玖隆行
土木学会論文集C（地圏工学） 78 ( 2 ) 140 - 152 2022
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Reliability-based design for earth-fill dams against severe natural disaster events Reviewed
Shin-ichi Nishimura, Toshifumi Shibata, Takayuki Shuku
Soils and Foundations 61 ( 2 ) 271 - 282 2021.4
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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV
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Evaluation of spatial distribution for permeability based on CPTU and geostatistics Reviewed
S. Nishimura, G. Kubota, T. Shibata, T. Shuku
6th International Conference on Geotechnical and Geophysical Site Characterization ISC2020-237 2021
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Soil classification and correlation between Swedish weight sounding test results and strength parameter Reviewed
T.Shibata, S. Nishimura, T. Shuku, S. Futatsugi, A. Nishimura
6th International Conference on Geotechnical and Geophysical Site Characterization ISC2020-84 2021
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Case history of risk evaluation of earth-fill dams due to heavy rain Reviewed
T. Shibata, S. Nishimura, T. Tateishi, S. Kuroda, T. Kato, K. Kuribayashi, N. Tanaya
International Journal of Geoengineering Case Histories 6 ( 4 ) 85 - 100 2021
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Evaluation of liquefaction probability of earth-fill dam over next 50 years using geostatistical method based on CPTU Reviewed
6th International Conference on Geotechnical and Geophysical Site Characterization 2021
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3次元計測を利用した効率的な3次元有限要素モデル化法の提案
金重 稔, 西村伸一, 柴田俊文, 珠玖隆行
岡山大学環境理工学部研究報告 25 ( 1 ) 1 - 4 2020.3
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農業用水路トンネルの模型実験に対する個別要素法の適用性 Reviewed
柴田俊文, 田本敏之, 西村伸一, 珠玖隆行, 福元豊
農業農村工学会論文集 88 ( 1 ) I_105 - I_116 2020
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3次元計測に基づくため池堤体の有限要素モデル化と地震応答解析 Reviewed
金重稔, 西村伸一, 柴田俊文, 珠玖隆行
農業農村工学会論文集 89 ( 1 ) I_181 - I_189 2020
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Disaster report of 2018 July heavy rain for geo-structures and slopes in Okayama Reviewed
S. Nishimura, Y. Takeshita, S. Nishiyama, S. Suzuki, T. Shibata, T. Shuku, M. Komatsu, B. Kim
Soils and Foundations 60 ( 1 ) 300 - 314 2020
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Evaluation of liquefaction probability of earth-fill dam over next 50 years using geostatistical method based on CPT Reviewed
Kazunari Imaide, Shin-ichi Nishimura, Toshifumi Shibata, Takayuki Shuku, Akira Murakami, Kazunori Fujisawa
Soils and Foundations 59 ( 6 ) 1758 - 1771 2019.12
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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV
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逆解析を用いた地盤の長期挙動予測における観測期間と構成式の影響 Reviewed
柴田俊文, 西村伸一, 珠玖隆行
構造物の安全性および信頼性Vol.9（JCOSSAR2019）論文集 343 - 349 2019.10
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CPTU を利用した透水係数の空間分布推定 Reviewed
窪田郷, 西村伸一, 柴田俊文, 珠久隆行
構造物の安全性および信頼性Vol.9（JCOSSAR2019）論文集 516 - 522 2019.10
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Tatsuya Ueta, Shin-Ichi Nishimura, Kazunari Imaide, Toshifumi Shibata, Takayuki Shuku
Paddy and Water Environment 17 ( 2 ) 291 - 297 2019.4
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Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC
DOI： 10.1007/s10333-019-00722-5
Other Link： http://link.springer.com/article/10.1007/s10333-019-00722-5/fulltext.html
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Prediction of long-term settlement and evaluation of pore water pressure using particle filter Reviewed
Toshifumi Shibata, Takayuki Shuku, Akira Murakami, Shin-ichi Nishimura, Kazunori Fujisawa, Noritaka Hasegawa, Satoshi Nonami
Soils and Foundations 59 ( 1 ) 67 - 83 2019.2
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Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV
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地質統計手法に基づくため池堤体強度の空間分布評価 Reviewed
今出和成, 西村伸一, 柴田俊文, 珠玖隆行
農業農村工学会論文集 87 ( 1 ) II_29 - II_38 2019
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機械学習に基づく室内試験用メタンハイドレートサンプルの自動選択 Reviewed
珠玖隆行, 津田大成, 西村伸一, 柴田俊文
構造物の安全性および信頼性 JCOSSAR2019論文集 9 523 - 524 2019
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Surrogate models based on sparse estimation for geotechnical reliability analysis Reviewed
T. Shuku, M. Nishio, S. Nishimura, T. Shibata
Proc. of 16ARC 2019
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Evaluation of the spatial variability of cone penetration resistance inside an earth-fill dam composed of materials with different particle sizes with use of geostatistics Reviewed
K. Imaide, S. Nishimura, T. Shibata, T. Shuku
Proc. of 16ARC 2019
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Evaluation of expected damage costs for earth-fill breaches due to heavy rains by response surface method Reviewed
S. Nishimura, T. Shuku, T. Shibata
Proc. of 16ARC 2019
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Identification of spatial distribution of permeability in dikes by CPTs
Shin-Ichi Nishimura, Kazunari Imaide, Toshifumi Shibata, Takayuki Shuku
13th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP 2019 2019
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Seoul National University
In this study, the spatial variability of the strength and permeability inside and underneath a river dike are addressed. Cone penetration tests (CPTs) were conducted at the river dike site, which has piping histries. In addition, CPTs were conducted in the laboratory as model tests on soil sampled from the river dike site, and permeability tests were also conducted on the same samples. Based on the laboratory tests, the relationship between the CPT results, which include the tip resistance, the side friction, and the pore pressure, and the permeability is derived. The relationship is applied to the in-situ test results. In conclusion, the spatial variability of the strength and permeability of the test site is evaluated with a geostatistical simulation technique.
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Estimation of strength parameters and soil classification based on Swedish weight sounding results
T. Kanamoto, T. Shibata, S. Nishimura, T. Shuku, S. Futatsugi, A. Nishimura
7th Korea-Japan Geotechnical Engineering Workshop 31 - 34 2018
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弾粘塑性FEMと観測データに基づいた斜面の変形挙動評価 Reviewed
二木重博, 西村伸一, 珠玖隆行, 柴田俊文
農業農村工学会論文集 86 ( 1 ) II_9 - II_18 2018
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CPT結果とせん断波速度の合成による地盤強度の空間分布に対する換算誤差の影響 Reviewed
植田起也, 西村伸一, 今出和成, 柴田俊文, 珠玖隆行
土木学会論文集A2（応用力学） 74 ( 2 ) I_95 - I_104 2018
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粒度の異なる材料が混合されたため池堤体におけるコーン貫入抵抗の空間分布評価 Reviewed
今出和成, 西村伸一, 柴田俊文, 珠玖隆行
土木学会論文集C（地圏工学） 74 ( 2 ) 213 - 224 2018
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応答曲面法による豪雨時のため池破堤に関する信頼性設計 Reviewed
西村伸一, 水間啓慈, 珠玖隆行, 柴田俊文
地盤工学会誌 66 ( 4 ) 8 - 11 2018
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Kazunari IMAIDE, Shin-ichi NISHIMURA, Toshifumi SHIBATA, Takayuki SHUKU
Journal of Japan Society of Civil Engineers, Ser. C (Geosphere Engineering) 74 ( 2 ) 213 - 224 2018
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Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
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Tatsuya UETA, Shin-ichi NISHIMURA, Kazunari IMAIDE, Toshifumi SHIBATA, Takayuki SHUKU
Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 74 ( 2 ) I_95 - I_104 2018
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Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
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CPTU を利用した河川堤防弱部と透水性空間分布の同定 Reviewed
西村伸一, 今出和成, 植田起也, 柴田俊文, 珠玖隆行
第61回地盤工学シンポジウム発表論文集 2018
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平成 30 年 7 月豪雨での広島県と岡山県のため池の被害 Reviewed
柴田俊文, 西村伸一
第61回地盤工学シンポジウム発表論文集 2018
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Spatial Distribution of Strength - Comparison between Indian and Japanese Embankments Reviewed
S. Nishimura, K. Imaide, T. Ueta, T. Hayashi, K. Inoue, T. Shibata, B. Chaudhary
Proc. of 3rd Indo-Japan Workshop on Geotechnics for Natural Disaster Mitigation and Management 2017.12
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アントコロニー最適化手法による土木施工の効率化 Reviewed
原田文仁, 珠玖隆行, 西村伸一, 柴田俊文
地盤と建設 35 ( 1 ) 213 - 217 2017
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Risk Evaluation of Earth Dam Breaches due to Heavy Rains with Use of Response Surface Method Reviewed
S. Nishimura, K. Mizuma, T. Shuku, T. Shibata
12th International Conference on Structural Safety and Reliability 2300 - 2308 2017
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Geostatistical Analysis for Identifying Weak Soil Layers in Dikes Reviewed
S. Nishimura, T. Shibata, T. Shuku, K. Imaide
GEO-RISK 2017: GEOTECHNICAL RISK ASSESSMENT AND MANAGEMENT GSP285 ( 285 ) 529 - 538 2017
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER SOC CIVIL ENGINEERS
The spatial distribution of the strength inside river dikes is generally identified through sounding tests. In this research, the electric Cone Penetration Test (CPT) is employed, and spatially long- and short-interval tests are mixed to efficiently evaluate the piping risk to a dike. The Indicator Simulation (IS) method is used as the geostatistical method to simulate the N value distribution and to predict the weak area inside the dike. The synthesized approach of the CPT and the Surface Wave Method (SWM), which is one of the geophysical methods, is proposed to compensate for the shortcoming of each approach when conducting the IS. Consequently, the correlation structure inside the dike can be identified accurately, the high resolution of the spatial distribution of the N values can be visualized, and the piping risk to the dike can be discussed based on the results of the investigation.
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Verification of Inversion Analysis of Consolidation Based on Model Test Results
65 ( 10 ) 22 - 25 2017
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Reliability-based design for earth-fills against severe natural hazard events Reviewed
S. Nishimura, T. Shibata, T. Shuku
Proc. of the 19th International Conference on Soil Mechanics and Geotechnical Engineering 3273 - 3276 2017
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Diagnosis of earth-fill dams by synthesised approach of sounding and surface wave method Reviewed
Shin-ichi Nishimura, Toshifumi Shibata, Takayuki Shuku
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards 10 ( 4 ) 312 - 319 2016.10
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Language：English Publishing type：Research paper (scientific journal) Publisher：Informa UK Limited
DOI： 10.1080/17499518.2016.1197406
Other Link： http://www.tandfonline.com/doi/pdf/10.1080/17499518.2016.1197406
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Prediction of Long-term Consolidation Behavior Considering Nonlinearity and Spatial Variability of Soil Parameters Reviewed
S. Nishimura, T. Shibata, T. Shuku
Proc.of the 6th Asian-Pacific Symposium on Structural Reliability and its Applications, APSSRA2016 630 - 635 2016.5
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Reliability-based design of earth-fill dams to mitigate damage due to severe earthquakes Reviewed
Shin-ichi Nishimura, Takayuki Shuku, Toshifumi Shibata
Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards 10 ( 1 ) 83 - 90 2016.1
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Language：English Publishing type：Research paper (scientific journal) Publisher：Informa UK Limited
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Change of Physical and Chemical Properties of Dredged Sludge with Repeat of Drying and Wetting Reviewed
84 ( 3 ) II_45 - II_50 2016
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Language：Japanese Publishing type：Research paper (scientific journal)
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Prediction of long-term settlement and accurate analysis of horizontal displacement based on model test results
T. Shibata, S. Nishimura, T. Shuku
6th KGS-JGS Geotechnical Engineering Workshop 115 - 118 2016
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Application of mechanoluminescent sensors to visual inspections for existing geotechnical structures Reviewed
R. Murakami, T. Shuku, T. Shibata, S. Nishimura
Geotechnics for Sustainable Development – Geotech Hanoi 2016 1193 - 1196 2016
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INVERSE ANALYSIS OF CONSOLIDATION FOR ACCURATE PREDICTION OF HORIZONTAL DISPLACEMENT Reviewed
Toshifumi SHIBATA, Shin-ichi NISHIMURA, Takayuki SHUKU
Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 72 ( 2 ) I_97 - I_107 2016
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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
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VALIDATION OF PARAMETER IDENTIFICATION METHOD ON PREDICTION FOR LONGTERM CONSOLIDATION BEHAVIOR Reviewed
Shin-ichi NISHIMURA, Toshifumi SHIBATA, Takayuki SHUKU
Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 72 ( 2 ) I_35 - I_43 2016
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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers
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Simplified Estimation of Risk from Floods due to Earth Dam Breaches Using Response Surface Methods Reviewed
MIZUMA Keiji, NISHIMURA Shin-ichi, SHIBATA Toshifumi, SHUKU Takayuki
Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 301 ( 1 ) I_47 - I_55 2016
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Language：Japanese Publisher：The Japanese Society of Irrigation, Drainage and Rural Engineering
Floods due to dam breaches have the greatest influential effect on hydraulic structures for irrigation and drainage, and estimating the costs of damage to these structures is important for risk assessment and management in agricultural land improvement projects. Existing methods for estimating damage costs require many types of asset data and usually a long time because of complications, and is not applicable for the practice in estimation of the damage costs. To overcome the problems, the authors have proposed a surrogate model called response surface (RS). This study aimed to verify the accuracy of the proposed RS by applying the surrogate model to risk evaluation of dam breaches due to rainstorms. We compared the damage costs of four earth dams calculated by using RS and existing methods, and found that the variances between the results of RS and existing methods was smaller than the unbiased variance of the RS based on 21 results of flow analysis. Therefore, the proposed method can easily estimate the risks of dam breaches due to rainstorms.
Other Link： https://jlc.jst.go.jp/DN/JLC/20020753571?from=CiNii
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Numerical simulation of embankment failure due to overflow by Moving Particle Semi-implicit method Reviewed
T. Shuku, K. Fujisawa, S. Nishimura, T. Shibata
IDRE Journal 84 ( 1 ) I_31 - -I_38 2016
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Language：English Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Irrigation, Drainage and Rural Engineering
Recently, the evaluation of the failure potential of earth-filled dams has become important because of the increasing occurrence of storm rainfall. Although most instances of earth-filled dam failure are caused by overflow, in-depth knowledge of the mechanism of the erosion and failure process of embankments due to overflow is still lacking. This paper presents a numerical method for simulating an embankment erosion and failure process by the moving particle semi-implicit (MPS) method. To reasonably simulate the erosion and failure process of an embankment due to overflow, a simple erosion model whose parameters can be determined through erosion tests on embankment materials was newly incorporated into the original MPS method. An embankment erosion and failure process observed in a model test was simulated by the proposed MPS method to confirm its practicability. Although the simulation accuracy for the erosion rate is slightly low at the beginning of the erosion, the average simulated values of the erosion rate are almost the same as the experimental values. The proposed MPS method can be a useful tool in embankment design practices to simulate embankment erosion due to overflow and to discuss remedial measures against overflow.
Other Link： https://jlc.jst.go.jp/DN/JLC/20020753557?from=CiNii
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Sensitivity analysis of earth-filled dams based on experimental design Reviewed
T. Shuku, S. Nishimura, T. Shibata
IDRE Journal 83 ( 4 ) II_77 - II_82 2015
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Risk Evaluation of Earth-fills Due to Severe Earthquakes and Heavy Rains Reviewed
S. Nishimura, T. Shibata, T. Shuku, K. Mizuma
Proceedings of Symposium on Reliability of Engineering Systems 115 - 124 2015
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Diagnosis of Earth-Fill Dams by Several Sounding Tests Reviewed
Shin-ichi Nishimura, Toshifumi Shibata, Takayuki Shuku
GEOTECHNICAL SAFETY AND RISK V 334 - 339 2015
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：IOS PRESS
The spatial distribution of the strength inside an earth-fill dam is identified by sounding tests. In this research, the Swedish Weight Sounding (SWS) test is employed, and the spatially high-density test is possible to identify the spatial correlation structure by the SWS. The correlation structure of an earth-fill could be identified accurately based on the sounding results, and the high resolution of the spatial distribution could be visualized by using the indicator simulation. Consequently, it has been verified the practical use of the spatial distribution of the probability that the N-value is lower than the threshold value, may be used for the maintenance of an earth-fill dam.
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Reliability-based design for earth-fill dams against heavy rains Reviewed
Shin-Ichi Nishimura, Takayuki Shuku, Toshifumi Shibata, Kazunori Fujisawa
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability 2 ( 71 ) 2440 - 2444 2015
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Asian Regional Conference on Soil Mechanics and Geotechnical Engineering
To mitigate the disasters of decrepit earth-fill dams, improvement work is conducted. Since there is a recent demand for low-cost improvements, the development of a design method for optimum improvement work at a low cost is the final objective of this research. The reliability-based design approach is discussed as such a design method. Heavy rains are the most serious events for aged fill-dams, and sometimes overflows leading to breaching occur. From the estimated probability of overflow, the probability of submergence in the downstream is estimated for the reliability-based design. The remarkable point in this paper is that the probability of occurrences of heavy rains and the uncertainty of the soil properties are simultaneously considered for the design. Considering the disaster loss, the risk of submergence could be assessed.
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An eco-friendly design method for geotechnical structures based on LCC Reviewed
T. Shuku, S. Nishimura, Y. Shimokado, T. Shibata
LIFE-CYCLE OF STRUCTURAL SYSTEMS: DESIGN, ASSESSMENT, MAINTENANCE AND MANAGEMENT 1398 - 1404 2015
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP
This study presents an eco-friendly design method for infrastructures based on contingent valuation method (CVM). First, a questionnaire survey based on the CVM was conducted to estimate monetary values of stream habitat which can be damaged by river improvement works such as flood prevention works. Second, a design method which can quantitatively evaluate impacts on stream habitat due to flood prevention works was proposed by combining computation of non-uniform flow with a method of stream habitat estimation called physical habitat simulation model (PHABSIM). Finally, monetary value of environmental loss due to flood prevention works was estimated by using results of CVM, and the effectiveness of the eco-friendly design method was discussed through a numerical example.
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Diagnosis of earth-fill dams by synthesized approach of sounding and surface wave method Reviewed
S. Nishimura, T. Shibata, T. Shuku
Proceedings of the 12th International Conference on Applications of Statistics and Probability in Civil Engineering 64 - 70 2015
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Reliability-based Design for Overflow Failure of Earth-fill Dams due to Heavy Rains
Nishimura Shin-ichi, Shuku Takayuki, Shibata Toshifumi, Fujisawa Kazunori
63 ( 5 ) 30 - 31 2015
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ため池破堤による想定リスクの簡易評価手法 Reviewed
水間啓慈, 西村伸一, 柴田俊文, 珠玖隆行
構造物の安全性および信頼性Vol.8（JCOSSAR2015）論文集 475 - 481 2015
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MIZUMA Keiji, NISHIMURA Shin-ichi, SHIBATA Toshifumi, SHUKU Takayuki
Journal of the Agricultural Engineering Society, Japan 299 ( 5 ) I_147 - I_153 2015
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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Irrigation, Drainage and Rural Engineering
Most of small earth dams in Japan were constructed at least 100 years ago and need to be improved because Japan is constantly at risk of severe earthquakes and heavy rainstorms. When improvements of earth dams are planned, small earth dams that have a higher risk of dam breaches should be given priority for improvement. Although a risk is defined as the product of occurrence probability and damage costs, estimating the damage costs using existing methods is very difficult and complicated. Therefore, simplified methods are necessary to select earth dams that must be preferentially improved. In order to overcome the difficulties in estimating damage costs, this study proposed a simplified estimation method for damage costs of floods due to earth dam breaches using a response surface method (RSM). RSM is a methodology that produces regression equations, called response surface, that quantitatively express the relationships between responses (output) and factors (input) by regression analyses based on experimental designs. Although many factors need to be considered to estimate damage costs of floods due to dam breaches, this study focused on four factors that largely affect the damage costs as based on results from a sensitivity analysis. Then a response surface that can estimate damage costs of floods was created by using the four parameters and its applicability was examined. As a result, the determination coefficient of the response surface R2 was 0.84 and the proposed response surface can be easily applied to estimate damage costs of floods due to dam breaches.
Other Link： https://jlc.jst.go.jp/DN/JLC/20015919326?from=CiNii
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A Simplified Method for Estimating Costs of Damage due to Floods Arising from Earth-dam Breaches Reviewed
MIZUMA Keiji, NISHIMURA Shin-ichi, SHIBATA Toshifumi, SHUKU Takayuki
Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 295 ( 1 ) 39 - 46 2015
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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Irrigation, Drainage and Rural Engineering
Earth-dam breaches arise from earthquakes and severe rainstorms and sometimes cause downstream floods. Floods have the greatest influential effect on hydraulic structures for irrigation and drainage, and estimating the costs of damage to these structures is important for risk assessment and management in agricultural land improvement projects. Although some methods for estimating damage costs have been proposed, most of these methods require many types of asset data and usually a long time because of complications. This paper proposes a simplified method for estimating damage costs in flood zones due to breach of earth-dams. The proposed method is based on asset data that are freely available, economical and easier to apply to practices in land improvement projects. Flood analyses of three actual earth-fill dams were performed, and the costs of damage in their flood zones estimated based on the results of the flood analyses using the proposed method. The proposed method estimated damage costs with ease, and accuracy was almost the same as other existing methods. Therefore, the proposed method can be a useful tool in agricultural land improvement projects.
Other Link： https://jlc.jst.go.jp/DN/JLC/20021009394?from=CiNii
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Evaluation of Strength of Soft Ground Improved by Vacuum Consolidation Reviewed
T. Shibata, S. Nishimura, M. Fujii, A. Murakami
Geotechnical Engineering Journal of the SEAGS & AGSSEA 46 ( 1 ) 95 - 102 2015
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Prediction of the ground and dyke behavior with vacuum consolidation Reviewed
T. Shibata, A. Murakami, M. Fujii
Computer Methods and Recent Advances in Geomechanics 1223 - 1228 2015
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP
The present paper addresses the prediction of the behavior of a ground and a reservoir dyke with a retaining wall at the site of a regulating reservoir whose soft soil foundation is improved by using both the usual em-bankment preloading and vacuum consolidation. To evaluate the settlement, a numerical analysis using an elasto-plastic FEM for soil-water coupled problems, incorporating the SYS Cam-clay model, is carried out, and an inverse analysis approach is adopted. The particle filter is used to identify the geomechanical parame-ters based on the measured settlement. A prediction of the surface deformation and the displacements at the crown of the precast retaining wall is performed using the identified parameters.
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地震と豪雨によるため池のリスク評価 Reviewed
西村伸一, 古宅瑞穂, 柴田俊文, 珠玖隆行, 水間啓慈
構造物の安全性および信頼性Vol.8（JCOSSAR2015）論文集 482 - 487 2015
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ため池の地震時リスク評価 Reviewed
西村伸一, 柴田俊文, 珠玖隆行, 水間啓慈
水土の知 83 ( 12 ) 1027 - 1030 2015
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地質統計学手法によるアースダム堤体におけるCPT先端抵抗分布の推定 Reviewed
今出和成, 西村伸一, 珠玖隆行, 柴田俊文, 村上 章, 藤澤和謙
構造物の安全性および信頼性Vol.8（JCOSSAR2015）論文集 622 - 629 2015
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一次元圧密の逆解析 Reviewed
珠玖隆行, 西村伸一, 柴田俊文
構造物の安全性および信頼性Vol.8（JCOSSAR2015）論文集 454 - 458 2015
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鋼橋梁の腐食減耗量とLCC算定方法の提案 Reviewed
石故有生也, 柴田俊文, 大屋 誠, 武邊勝道, 広瀬 望
構造物の安全性および信頼性Vol.8（JCOSSAR2015）論文集 615 - 621 2015
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神戸空港島の地盤沈下予測に対する粒子フィルタの適用 Reviewed
柴田俊文, 珠玖隆行, 村上 章, 西村伸一
構造物の安全性および信頼性Vol.8（JCOSSAR2015）論文集 459 - 465 2015
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Sensitivity analysis of slope stability based on orthogonal designs Reviewed
T. Shuku, S. Nishimura, T. Shibata
Computer Methods and Recent Advances in Geomechanics 1043 - 1048 2015
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP
This study has investigated sensitivity of input parameters in stability analysis of earthen embankments to its factor of safety (F-s) using an experimental design approach. Computer experiments based on orthogonal designs were carried out to achieve efficient experiments, and a linear regression model was applied to analyze the results of the experiment. The Standardized Regression Coefficients (SRCs) obtained from the regression analysis was employed as indexes of the sensitivity of the input parameters to the F-s. The results of the sensitivity analysis showed that the parameters about the geometry of embankments such as height and slope gradient are more sensitive to F-s, although the parameters about hydraulic characteristics of embankment materials are less sensitive to the F-s. In addition, interaction effects between input parameters were also analyzed, and its sensitivity to F-s was discussed.
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Reliability-based design of earth-fill dams regarding heavy rains and earthquakes Reviewed
S. Nishimura, T. Shuku, T. Shibata, K. Fujisawa
LIFE-CYCLE OF STRUCTURAL SYSTEMS: DESIGN, ASSESSMENT, MAINTENANCE AND MANAGEMENT 1390 - 1397 2015
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP
This research deals with a strategy for the maintenance of geotechnical structures such as earth fill dams. Standard penetration test (SPT) N-values are frequently used to determine the soil parameters. Firstly, based on the statistical model for the N-values, the shear strength parameters are derived through the empirical relationships. Secondly, a reliability analysis of the embankments is conducted considering the variability of the internal friction angle and the seismic hazard. Thirdly, the probability of overflow of earth fills during heavy rains is evaluated. The rainfall intensity is dealt with as a probabilistic parameter, and the various rainfall patterns are tested by the Monte Carlo method.
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Reliability-based design of earth-fill dams to mitigate damage due to severe earthquakes Reviewed
S. Nishimura, T. Shuku, T. Shibata
Computer Methods and Recent Advances in Geomechanics 1289 - 1294 2015
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：CRC PRESS-TAYLOR & FRANCIS GROUP
This research deals with a strategy for the maintenance of geotechnical structures such as earth-fill dams. Standard PenetrationTest (SPT) N-values are frequently used to determine the soil parameters. Firstly, a statistical model for the N-values is determined from sounding test results. In this research, however, Swedish Weight Sounding (SWS) tests are employed as they are simpler than SPT. Secondly, an indicator simulation is conducted to interpolate the spatial distribution of the N-values, and the results are utilized to find degraded areas inside the embankments and to maintain the embankments. Based on the statistical model for the N-values, the shear strength parameters are derived through the empirical relationships. Then, a reliability analysis of the embankments is conducted considering the variability of the internal friction angle and the seismic hazard.
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Prediction of embankment behavior of regulating reservoir with foundation improved by vacuum consolidation method Reviewed
Toshifumi Shibata, Akira Murakami, Makoto Fujii
SOILS AND FOUNDATIONS 54 ( 5 ) 938 - 954 2014.10
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Language：English Publishing type：Research paper (scientific journal) Publisher：JAPANESE GEOTECHNICAL SOC
The present paper addresses the numerical prediction of the behavior of a ground and a reservoir dyke with a retaining wall at the site of a regulating reservoir whose soft soil foundation is improved by using both the usual embankment preloading and vacuum consolidation. To evaluate the settlement, the lateral deformation, and the dissipation of pore pressure during Vacuum preloading, a numerical analysis using an elasto-plastic FEM for soil water coupled problems, incorporating the SYS Cam-clay model, is carried out in two dimensions. However, a change in the soil parameters during the vacuum preloading leads to a less accurate computation. To account for the uncertainties in the input parameters of the constitutive model for the improved ground, an inverse analysis approach is adopted. The particle filter is used to identify the compression index of the clay layers and the coefficient of permeability of the organic soil layer based on the measured settlement at the bottom of the preloading embankment during the vacuum consolidation. The reservoir dyke with a retaining wall is constructed on an improved foundation after removing the preloading embankment, and an attempt is made to predict its performance after construction by an elasto-plastic FEM for soil water coupled problems using the identified parameters. (C) 2014 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V. All rights reserved.
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Numerical simulation of dyke breach process using MPS method Reviewed
T. Shuku, S. Hirayama, S. Nishimura, T. Shibata
Proceedings of the 24th International Ocean and Polar Engineering Conference 693 - 696 2014
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粒子群最適化法による最小安全率の探索 Reviewed
工藤賢司, 珠玖隆行, 西村伸一, 柴田俊文
32 ( 1 ) 61 - 68 2014
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Reliability-based design of earth-fill dams considering probability of heavy rains and uncertainty of soil properties Reviewed
S. Nishimura, H. Nagao, K. Fujisawa, T. Shuku, T. Shibata
Proceedings of 1st International Conference on Computational Engineering and Science for Safety and Environmental Problems 160 - 163 2014
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Reliability-Based Design of Earth-Fill Dams to Mitigate Damage Due to Severe Earthquakes Reviewed
S. Nishimura, T. Shuku, T. Shibata
Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management - Proceedings of the 2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014 2350 - 2359 2014
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：American Society of Civil Engineers (ASCE)
This research deals with a strategy for the maintenance of geotechnical structures such as earth-fill dams. Standard penetration test (SPT) N-values are frequently used to determine the soil parameters. Firstly, a statistical model for the N-values is determined from sounding test results. In this research, however, Swedish weight sounding (SWS) tests are employed as they are simpler than SPT. Secondly, an indicator simulation is conducted to interpolate the spatial distribution of the N-values, and the results are utilized to find degraded areas inside the embankments and to maintain the embankments. Based on the statistical model for the N-values, the shear strength parameters are derived through the empirical relationships. Then, a reliability analysis of the embankments is conducted considering the variability of the internal friction angle and the seismic hazard.
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An eco-friendly design method for infrastructures based on CVM Reviewed
Y. Shimokado, T. Shuku, S. Nishimura, T. Shibata
Proceedings of the 24th International Ocean and Polar Engineering Conference 754 - 759 2014
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Observational Design Method for Earth Structures using Particle Filter Reviewed
Takayuki Shuku, Shin-Ichi Nishimura, Toshifumi Shibata
Vulnerability, Uncertainty, and Risk: Quantification, Mitigation, and Management - Proceedings of the 2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014 2449 - 2458 2014
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Language：English Publishing type：Research paper (international conference proceedings) Publisher：American Society of Civil Engineers (ASCE)
This study presents a reliability-based design method for geotechnical structures based on the observational method, which can be used as a methodology for the performance verification of geotechnical structures. In the proposed method, the soil-water coupled finite element analysis is utilized as a performance-verification method, and stochastic uncertainties inherent in the geotechnical parameters are evaluated by a Monte Carlo simulation. The proposed method can select the optimum design/construction method from several design alternatives, from the viewpoint of Life Cycle Cost, and the predictions at the initial design stage are sequentially updated by the particle filter. The proposed method is applied to a numerical example of the construction problem of embankment specified quantitative performance criteria, such as allowable settlements and the probability of their exceedance, and the feasibility of the method is examined in this example.
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Parameter identification of elasto-plastic constitutive models using ensemble-based filter
T. Shuku, S. Nishimura, T. Shibata
5th KGS-JGS Geotechnical Engineering Workshop 69 - 80 2013
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Numerical simulation of embankment failure due to overflow using particle method
S. Hirayama, T. Shuku, S. Nishimura, K. Fujisawa, T. Shibata
5th KGS-JGS Geotechnical Engineering Workshop 27 - 36 2013
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Centrifuge evaluation of data assimilation for deformation behavior of clay foundation Reviewed
T. Shuku, S. Nishimura, T. Shibata
The 1st International Conference on Civil and Building Engineering Informatics 225 - 233 2013
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模型実験結果に基づく長期沈下予測法の検証 Reviewed
西村伸一, 珠玖隆行, 山田典弘, 柴田俊文
土木学会論文集A2（応用力学） 69 ( 2 ) I_29 - I_38 2013
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MPS法によるニューマチックケーソン施工時の地盤変形解析 Reviewed
珠玖隆行, 西村伸一, 川﨑 元, 尾形恒夫, 柴田俊文
地盤と建設 31 ( 1 ) 37 - 46 2013
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A stabilization procedure for soil-water coupled problems using the element-free Galerkin method Reviewed
T. Shibata, A. Murakami
COMPUTERS AND GEOTECHNICS 38 ( 5 ) 585 - 597 2011.7
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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD
The development of stability problems related to classical mixed methods has recently been observed. In this study, a soil-water coupled boundary-value problem, one type of stability problem, is presented using the element-free Galerkin method (EFG method). In this soil-water coupled problem, anomalous behavior appears in the pressure field unless a stabilization technique is used. The remedy to such numerical instability has generally been to adopt a higher interpolation order for the displacements than for the pore pressure. As an alternative, however, an added stabilization term is incorporated into the equilibrium equation. The advantages of this stabilization procedure are as follows: (1) The interpolation order for the pore pressure is the same as that for the displacements. Therefore, the interpolation functions in the pore pressure field do not reduce the accuracy of the numerical results. (2) The stabilization term consists of first derivatives. The first derivatives of the interpolation functions for the EFG Method are smooth, and therefore, the solutions for pore pressure are accurate. In order to validate the above stabilization technique, some numerical results are given. It can be seen from the results that a good convergence is obtained with this stabilization term. (C) 2011 Elsevier Ltd. All rights reserved.
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Characteristics of Free Surface Oscillations in Open Channel Flows with a Side-cavity Reviewed
I. Kimura, S. Mino, T. Hosoda, Y. Shimizu, T. Shibata
International Conference on Water and Flood Management 2009 1 177 - 184 2009
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Estimation of horizontal subgrade reaction coefficient by inverse analysis Reviewed
N. Kobayashi, T. Shibata, Y. Kikuchi, A. Murakami
COMPUTERS AND GEOTECHNICS 35 ( 4 ) 616 - 626 2008.7
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Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD
The subgrade reaction coefficient of a foundation soil in an open pier has been identified using an extended Kalman filter (EKF) based on measurements taken during in situ horizontal loading tests on a pile. For the in situ tests, the surface clay layer was removed, and the diluvial clay layer was replaced by a rubble mound to reduce the length of the pile above the surface of the foundation deposit. The tests were carried out for both the existing diluvial clay deposit and the replacement rubble mound for purposes of comparing the identified subgrade reaction coefficients in Euler-Bernoulli's beam equation with nonlinear springs. The measured deflection and the bending moment determined in the tests were used as input data for the inverse analysis. Analysis revealed that the identified subgrade reaction coefficient of the rubble mound is less than that of the diluvial clay under the same level of loading. The numerical results will provide useful information for the future design of open piers and their foundations. (C) 2007 Elsevier Ltd. All rights reserved.
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A Stabilization Procedure for Soil-water Coupled Problems Using the Mesh-free Method Reviewed
T. Shibata, A. Murakami
12th IACMAG 64 - 70 2008
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Inverse analysis for nonlinear problem by Unscented Kalman filter Reviewed
A. Murakami, S. Kasamatsu, S. Nishimura, T. Shibata, R. Takata
4th international conference on advances in Structural Engineering and Mechanics 1134 - 1141 2008
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Stabilizing mesh-free method for soil-water coupled problems Reviewed
T. Shibata, A. Murakami
International Society for Soil Mechanics and Geotechnical Engineering 13th Asian Regional Conference 12 ( 2 ) 1089 - 1092 2007
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A Stabilization Procedure for Soil-water Coupled Problems Using the Element-Free Galerkin Method Reviewed
T. Shibata, A. Murakami
7th World Congress on Computational Mechanics 1472 2006
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局所変形を考慮に入れた平板に作用する衝撃力の近似計算法の適用性 Reviewed
柴田俊文, 三上隆, 須藤敦史, 蟹江俊仁
応用力学論文集 7 ( 1 ) 39 - 45 2004
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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：土木学会
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衝撃力作用時における梁の減衰定数と剛性の同時同定 Reviewed
柴田俊文, 三上隆, 須藤敦史, 蟹江俊仁, 上田務
構造工学論文集 49A 1253 - 1258 2003
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Simultaneous Identification of Damping Factor and Stiffness on Beams under Impact Loading Reviewed
T. Shibata, T. Mikami, A. Sutoh
Proceedings of the 5th Asia-Pacific Conference on Shock & Impact Loads on Structures 347 - 352 2003
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カルマンフィルタによる梁の衝撃力の同定 Reviewed
柴田 俊文, 三上 隆, 須藤 敦史, 蟹江 俊仁
構造工学論文集 48A 1485 - 1491 2002
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Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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梁に作用する衝撃力に関する研究
柴田俊文
北海道大学 2001
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AN APPROXIMATE METHOD FOR IMPACT FORCE DUE TO COLLISION BETWEEN A BEAM AND A SPHERE Reviewed
SHIBATA Toshifumi, MIKAMI Takashi, SATOH Masashi, SUTOH Atsushi
647 ( I-51 ) 167 - 176 2000
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Language：Japanese Publishing type：Research paper (scientific journal)
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An approximate method for estimating impact force on beams considering local deformation Reviewed
T. Shibata, T. Mikami, A. Sutoh
The 7th East Asia-Pacific Conference on Structural Engineering and Construction 267 - 272 1999
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梁に作用する非定常な衝撃荷重の同定 Reviewed
柴田 俊文, 須藤 敦史, 三上 隆
応用力学論文集 1 ( 1 ) 91 - 98 1998
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An identification of impact load acting on beams by extended Kalman filter Reviewed
T. Shibata, T. Mikami, A. Sutoh, N. Nirasawa
The 6th East Asia-Pacific Conference on Structural Engineering and Construction 3 2213 - 2218 1998
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局所変形の影響を考慮した梁の衝撃力の一計算法 Reviewed
柴田俊文, 三上隆, 佐藤昌志, 須藤敦史, 韮澤憲吉
構造工学論文集 44A 1753 - 1759 1998
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Impact analysis of beams considering local deformation Reviewed
T. Mikami, T. Shibata, N. Nirasawa, A. Sutoh
2nd Asia-Pacific Conference on Shock & Impact Loads on Structures 363 - 368 1997
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MISC
MISC
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MPS法を用いたため池に流入する土石流の数値解析
絹輪太一, 柴田俊文, 珠玖隆行, 西村伸一
第73回農業農村工学会大会講演会 81 - 83 2024
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のり面で実施したSWS試験を用いたため池堤体の評価
ウシンイェ, 柴田俊文, 西村伸一
第49回地盤工学セミナー報告会 2024
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CPTuに基づく地盤透水係数の空間分布推定
太田大希, 西村伸一, 柴田俊文
第49回地盤工学セミナー報告会 2024
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MPS法によるため池堤体に対する衝撃圧の分析
絹輪太一, 柴田俊文, 珠玖隆行, 西村伸一
第79回農業農村工学会中国四国支部講演会 2024
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ボーリング孔を利用したため池堤体でのミューオン探査
高橋健, 柴田俊文, 西村伸一
第79回農業農村工学会中国四国支部講演会 84 - 86 2024
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表面波探査とSWS試験に基づくため池堤体の地盤強度分布推定
片山晃成, 西村伸一, 柴田俊文
第79回農業農村工学会中国四国支部講演会 90 - 92 2024
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Simplified calculation method of safety factor of reservoir using 3D FEM
Y. Zhou, T. Shibata, S. Nishimura
第49回地盤工学セミナー報告会 2024
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RBSMによる農業用水路トンネルの多方向載荷実験の解析
L. Huang, T. Shibata, S. Nishimura
第49回地盤工学セミナー報告会 2024
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Two-direction loading experiment on irrigation tunnels
Q. Cao, T. Shibata, S. Nishimura
第49回地盤工学セミナー報告会 2024
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表面波探査とSWS試験に基づくため池堤体の地盤強度分布推定
片山晃成, 西村伸一, 柴田俊文
第49回地盤工学セミナー報告会 2024
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Deformation behavior of irrigation tunnels unedr two-direction loading
曹 秋雨, 柴田俊文, 西村伸一
第79回農業農村工学会中国四国支部講演会 93 - 95 2024
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Numerical Simulation of Tunnel Stress-Strain Behavior under Bi-directional Loading Using RBSM: A Comparative Analysis with Machine Learning Models
黃 凌灝, 柴田俊文, 西村伸一
第79回農業農村工学会中国四国支部講演会 96 - 98 2024
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GPRを利用したCPTuに基づく地盤透水係数の空間分布推定
太田大希, 西村伸一, 柴田俊文
第79回農業農村工学会中国四国支部講演会 105 - 107 2024
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ミューオン探査による湛水時のフィルダムの密度の推定
高橋健, 柴田俊文, 西村伸一, 珠玖隆行
第59回地盤工学研究発表会 2024
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Bi-directional loading tests on irrigation tunnels in soft rock
Q. Cao, T. Shibata, S. Nishimura
第73回農業農村工学会大会講演会 2024
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ミューオン探査で得たフィルダムの密度と試験値との比較
高橋健, 柴田俊文, 西村伸一, 珠玖隆行
第73回農業農村工学会大会講演会 2024
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ミューオン探査を用いたフィルダムの密度の推定
柴田俊文, 高橋健, 金子周平, 西村伸一, 珠玖隆行
第58回地盤工学研究発表会 2023
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気温上昇を想定した豪雨によるため池越流確率の評価
三原嵩史, 西村伸一, 柴田俊文, 珠玖隆行
第26回応用力学シンポジウム 2023
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豪雨条件に対するため池の安全率簡易推定式
仙波拓巳, 柴田俊文, 西村伸一
第58回地盤工学研究発表会 2023
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CPTuに基づいた堤体材料の透水係数推定
西村伸一, 柴田俊文, 珠玖隆行, 大西駿也
第58回地盤工学研究発表会 2023
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データベースを利用したため池堤体の土質定数の推定
永田望, 西村伸一, 柴田俊文, 珠玖隆行
第72回農業農村工学会大会講演会 2023
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データベースとベイズ機械学習を用いた堤体の土質定数の推定
永田望, 西村伸一, 柴田俊文, 珠玖隆行
第58回地盤工学研究発表会 2023
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POD に基づいた液状化解析の代替モデル
西村伸一, 新田智大, 柴田俊文, 珠玖隆行
第72回農業農村工学会大会講演会 2023
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気温上昇を想定した豪雨によるため池越流確率の評価
三原嵩史, 西村伸一, 工藤亮治, 柴田俊文, 珠玖隆行
第72回農業農村工学会大会講演会 2023
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GPRによる地盤剛性の空間分布推定を利用したため池堤体の三次元地震応答解析
西村伸一, 大橋亮太, 任宇翔, 金重稔, 柴田俊文, 珠玖隆行
第26回応用力学シンポジウム 2023
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レイリー波の位相速度によるデータ同化
任宇翔, 西村伸一, 柴田俊文, 珠玖隆行
第26回応用力学シンポジウム 2023
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SWS試験を用いた内部摩擦角の推定及び探査深度の土圧の検討
宇野翔太, 柴田俊文, 西村伸一, 珠玖隆行
第78回農業農村工学会中国四国支部講演会 53 - 55 2023
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ミュオグラフィを活用したフィルダムの内部探査
高橋健, 柴田俊文, 西村伸一, 珠玖隆行
第78回農業農村工学会中国四国支部講演会 50 - 52 2023
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気候変動に伴うため池破堤リスクの評価
三原嵩史, 西村伸一, 工藤亮治, 柴田俊文, 珠玖隆行
第78回農業農村工学会中国四国支部講演会 93 - 95 2023
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豪雨状況におけるため池堤体安全率の簡易的な評価手法
仙波拓巳, 柴田俊文, 西村伸一, 珠玖隆行
第78回農業農村工学会中国四国支部講演会 56 - 58 2023
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豪雨条件でのため池堤体安全率の簡易推定式
仙波拓巳, 柴田俊文, 西村伸一
第48回地盤工学セミナー報告会 2023
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平成30年7月豪雨におけるため池の三次元解析
李澤炬, 柴田俊文, 西村伸一, 珠玖隆行
第48回地盤工学セミナー報告会 2023
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応答曲面法によるため池の破堤確率の予測
鄭詩穎, 西村伸一, 柴田俊文, 陳依萌
第48回地盤工学セミナー報告会 2023
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Joint inversion of travel time and dispersion of surface wave data by ensemble Kalman filter
2023
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ため池破堤リスク評価手法のための応答曲面の精度検証
Chen Yimeng, Zheng Shiying, 西村伸一, 柴田俊文, 珠玖隆行
第78回農業農村工学会中国四国支部講演会 44 - 46 2023
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気温上昇を想定した豪雨によるため池越流確率の評価
三原嵩史, 西村伸一, 工藤亮治, 柴田俊文, 珠玖隆行
第48回地盤工学セミナー報告会 2023
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ため池堤体の土質定数を推定するシステムの構築
永田望, 西村伸一, 柴田俊文, 珠玖隆行
第78回農業農村工学会中国四国支部講演会 47 - 49 2023
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探査深度の土圧を考慮したSWS 試験による内部摩擦角の推定
宇野翔太, 柴田俊文, 西村伸一, 珠玖隆行
第72回農業農村工学会大会講演会 2023
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データベースとギブスサンプラーを活用した堤体の土質定数の推定
永田望, 西村伸一, 柴田俊文
第48回地盤工学セミナー報告会 2023
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宇宙線ミューオンによるフィルダムの堤体材料密度の同定
高橋健, 柴田俊文, 西村伸一, 金子周平, 珠玖隆行
第72回農業農村工学会大会講演会 2023
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Risk evaluation for earth-fill dams due to heavy rains by response surface method
2022
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特定載荷における軟岩地山を模擬した農業用水路トンネルの変形・破壊性状に関する研究
黄晨偉, 柴田俊文, 西村伸一, 珠玖隆行
第77回農業農村工学会中国四国支部講演会 2022
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応答曲面による豪雨時にため池の破堤リスク評価
鄭詩穎, 西村伸一, 柴田俊文
第71回農業農村工学会大会講演会 2022
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応答曲面法を用いたため池堤体の安全率と降伏震度の検討
柴田俊文, 柴川晃輝, 西村伸一
第77回農業農村工学会中国四国支部講演会 2022
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宇宙線ミューオンを用いたフィルダム内部探査
金子周平, 高橋健, 西村伸一, 柴田俊文, 珠玖隆行
第77回農業農村工学会中国四国支部講演会 2022
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ため池堤体の安全率の簡易評価手法
柴田俊文, 柴川晃輝, 西村伸一
第71回農業農村工学会大会講演会 2022
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応答曲面法によるため池堤体の安全率と降伏震度の評価
柴川晃輝, 柴田俊文, 西村伸一
第57回地盤工学研究発表会 2022
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気温上昇を想定した豪雨予測によるため池破堤確率の予測
舟木遼, 西村伸一, 柴田俊文, 珠玖隆行, 工藤亮治
農業農村工学会誌 90 ( 8 ) 2022
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平成30年7月豪雨におけるため池の安定性の検討
王佳妮, 西村伸一, 柴田俊文, 珠玖隆行
第75回農業農村工学会中国四国支部講演会講演要旨集 76 - 78 2021
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CPTU結果を利用した3次元浸透流解析
窪田郷, 西村伸一, 柴田俊文, 珠玖隆行
第75回農業農村工学会中国四国支部講演会講演要旨集 70 - 72 2021
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広島県内のため池における豪雨災害リスクの簡易評価に関する研究
立石翼, 西村伸一, 柴田俊文
第75回農業農村工学会中国四国支部講演会講演要旨集 61 - 63 2021
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CPTU結果を用いた河川堤防パイピングリスクの推定
窪田郷, 西村伸一, 柴田俊文, 珠玖隆行
第56回地盤工学研究発表会 12-6-1-06 2021
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Identification of strength distribution for earth-fill dams by ensemble Kalman filter
Y. Ren, S. Nishimura, T. Shibata, T. Shuku
2021
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地質統計手法と三次元計測に基づくため池堤体の地震応答解析
大橋亮太, 西村伸一, 柴田俊文, 珠玖隆行
第70回農業農村工学会大会講演会 4-16 2021
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農業用ため池の豪雨災害リスク評価に基づく対策優先度評価‐リスク評価のための応答曲面の提案‐
立石翼, 西村伸一, 柴田俊文, 黒田修一, 加藤智雄, 栗林健太郎, 棚谷南海彦
第56回地盤工学研究発表会 12-6-1-08 2021
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Application of ensemble Kalman filter onto earth-fill dam through surface wave
Y. Ren, S. Nishimura, T. Shibata, T. Shuku
III-43 2021
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応答曲面法を用いた切土斜面の安定性の簡易評価
柴田俊文, 近藤響貴, 珠玖隆行, 西村 伸一
第55 回地盤工学研究発表会 2020
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豪雨時におけるため池の破堤リスクに関する簡易評価
立石翼, 西村伸一, 柴田俊文, 平田竜也, 黒田修一, 加藤智雄, 栗林健太郎, 棚谷南海彦
2020年度農業農村工学会大会講演会講演要旨集 2020
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簡易なため池の豪雨時リスク評価
西村伸一, 柴田俊文, 立石翼, 平田竜也, 黒田修一, 加藤智雄, 栗林健太郎, 棚谷南海彦
第23回応用力学シンポジウム 2020
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農業用ため池の豪雨災害リスク評価に基づく対策優先度評価2 -リスク評価-
西村伸一, 柴田俊文, 立石翼, 平田竜也, 黒田修一, 加藤智雄, 栗林健太郎, 棚谷南海彦
第55 回地盤工学研究発表会 2020
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農業用ため池の豪雨災害リスク評価に基づく対策優先度評価1-破堤確率評価-
棚谷南海彦, 栗林健太郎, 黒田修一, 加藤智雄, 西村伸一, 柴田俊文, 立石翼, 平田竜也
第55 回地盤工学研究発表会 2020
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平成30年7月豪雨における岡山の土構造物及び斜面の災害
西村伸一, 竹下祐二, 柴田俊文, 小松満, 珠玖隆行, KIM Byeongsu
地盤工学会誌 67 ( 7 ) 2019
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背面空洞を有する農業用水路トンネルと地山の変状解析
柴田俊文, 田本敏之, 西村伸一, 珠玖隆行, 福元豊
土木学会年次学術講演会講演概要集(CD-ROM) 73rd 2018
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塑性圧作用時の農業用水路トンネルの変状解析
柴田俊文, 田本敏之, 西村伸一, 珠玖隆行, 福元豊
農業農村工学会大会講演会講演要旨集(CD-ROM) 2018 2018
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CPTによるため池堤体内部N値の空間分布推定
今出和成, 西村伸一, 珠玖隆行, 柴田俊文, 村上 章, 藤澤和謙
平成28年度農業農村工学会大会講演会 2016.8
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静的コーン貫入試験(CPT)によるため池堤体の強度分布推定
上田航平, 西村伸一, 珠玖隆行, 柴田俊文, 村上 章, 藤澤和謙
第49回地盤工学研究発表会 2014.7
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Language：Japanese Publishing type：Research paper, summary (national, other academic conference)
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大気圧工法による軟弱地盤の挙動に対するデータ同化 Reviewed
柴田俊文, 増谷 優, 藤井 睦, 村上 章
第62回理論応用力学講演会講演論文集 2013
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柴田俊文, 小林範之, 菊池喜昭, 村上章
理論応用力学講演会講演論文集 54th 71 - 72 2005.1
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Research Projects
Research Projects
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データベースと高精度地盤調査の連携によるため池群のリスク評価
Grant number：24H00534 2024.04 - 2028.03
日本学術振興会 科学研究費助成事業 基盤研究(A)
西村 伸一, 柴田 俊文, 工藤 亮治, 小松 満, 珠玖 隆行
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集中群配置型クロスホールミューオン探査手法の開発
Grant number：22K19223 2022.06 - 2025.03
日本学術振興会 科学研究費助成事業 挑戦的研究(萌芽)
西村 伸一, 柴田 俊文, 珠玖 隆行
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ため池群の保全を目的とした高精度地盤調査法の開発と広域リスク評価
Grant number：20H00442 2020.04 - 2024.03
日本学術振興会 科学研究費助成事業 基盤研究(A) 基盤研究(A)
西村 伸一, 柴田 俊文, 小松 満, 吉田 郁政, 珠玖 隆行
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Grant amount：\44980000 （ Direct expense: \34600000 、 Indirect expense：\10380000 ）
広域に多数存在するため池群のリスク評価手法の開発を最終目的とする．達成すべき具体的研究課題は，1)ため池堤体内および基礎地盤の可視化技術の開発；2)広範囲に多数存在するため池のリスクを表現する代替モデルの提案，である．この目的の達成のために，2020年度は，主に次の6項目について検討を行った．
(1)CPTU模型試験装置の開発，(2)クロスホールミューオン試験装置の開発を指向した模型地盤を用いたミューオン探査の基礎実験，(3)斜面走行型スクリューウェイト式サンディング装置の開発，(4)スパースモデリングや新たなデータサイエンス手法を用いた地盤内同定手法の開発，(5)堤防の越流破堤模型実験，(6)堤体破堤リスク手法の開発
本研究の大きな流れは，新たな地盤探査手法の開発→高精度地盤探査の達成→代替モデルによる高精度破堤リスク評価手法の開発であり，上記の(1)~(6)は，これら3項目のいずれかに関わるものである．(1)の模型実験装置は，CPTUを利用して，ため池堤体の透水係数分布を同定するためのものである．これによって，地盤強度，土質，透水係数を同時に同定する実験が可能となる．2020年度は，試験機を設計し，完成させることができた． (5)は，堤体の越流破壊挙動予測手法の開発を目指して行った，(2), (3), (4)は，地盤内部を同定する手法を確立するための実験および解析の研究である．(2)については，試験手法の精度を確認するためにその基礎実験を行った．(3)については，クローラに貫入機を装着させる基礎実験を行い，斜面での実験の可能性を探った．(6)は，豪雨と地震に対するリスク評価手法の開発で，(1)~(5)のすべての要素技術が統合される内容である．2020年度は，社会実装に向けて，応答曲面法を用いたため池のリスク評価手法を開発し，岡山県，広島県のため池に適用している． -
宇宙線ミュー粒子を用いた農業用水路トンネルの補強の評価手法の確立
Grant number：20K06297 2020.04 - 2023.03
日本学術振興会 科学研究費助成事業 基盤研究(C) 基盤研究(C)
柴田 俊文, 西村 伸一
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Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）
本申請課題では，地盤や構造物を透過した宇宙線ミュー粒子を測定し，このデータを用いて農業用水路トンネルの地山の地質不良区間の密度を推定する．そして，数値解析と模型実験を併用してトンネルと地山の相互挙動を明らかにし，耐震補強工法を再現することで，その効果を検討することを目的とする．
宇宙線ミュー粒子の測定手法とその精度を確認するため，大型土槽（中に試料としてまさ土を充填）とモルタル塊を準備し，シンチレータと光電子増倍管で構成された検出装置とサーベイメータを用いた基礎実験を実施した．ここで，モルタル塊は土槽の実験で用いたまさ土と異なる密度に設定した．同時に，実験室内に設置してあるコンクリート塊や実験棟（建物），そして何も設置していない状態に対して，透過したミュー粒子を測定して結果を比較した．
次に，多方向載荷試験を行った．覆工にモルタル（高強度），地山にベントナイトを混入したモルタル（低強度）を用いた供試体を作製し，鉛直方向と水平方向に油圧シリンダーにより荷重を作用させ，供試体の変形状況を確認した．その際，覆工と地山の間に生じている背面空洞の条件を変化させて実験を実施し，その影響を確認した．
数値解析では，有限要素法を用いてモデルを作成した，並行して，ひび割れの再現などの点で精度の高い剛体バネモデル（RBSM）を用いて数値解析を行った．解析モデルでは地山とトンネル覆工，背面空洞を再現し，水平方向から荷重を作用させ，載荷板変位，内空変位，載荷荷重，モデル全体の変形状況，ひび割れ発生状況などについて実験結果と比較した． -
宇宙線を利用した超小型物理探査装置の開発とため池群の広域リスク評価
Grant number：19K22349 2019.06 - 2021.03
日本学術振興会 科学研究費助成事業 挑戦的研究(萌芽) 挑戦的研究(萌芽)
西村 伸一, 柴田 俊文, 珠玖 隆行
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Grant amount：\6370000 （ Direct expense: \4900000 、 Indirect expense：\1470000 ）
西日本豪雨災害においは，多くのため池が損傷を受けた．この決壊および損傷原因の中で，パイピングとせん断破壊に対しては，堤体内部の弱部の推定が重要である．しかし，広域リスク評価の実施にあたって，ため池個数は膨大であり，一市町村をとってみても，地区全体のリスク評価を行うことは事実上不可能である．地質調査は，ボーリングが基本であるが，非常に時間とコストがかかる．また，現在の設計法では，ため池一つずつの安定解析を行い，氾濫解析を実施する必要があるため，解析モデルの構築と解析に負荷がかかり過ぎて広域の解析を不可能にしている．この問題を解決するのは，最も簡便に地質情報（ここでは，地盤強度）を計測できる物理探査が最も有効な手段と考えられる．本研究では，宇宙線の一つであるミュー粒子物理探査を利用して，地盤同定の高精度化を図る．宇宙線は，常時降り注いでいるので，計測器が設置されると時系列に堤体内部の三次元モニタリングが可能となる．これによって，豪雨時や地震時の堤体内部の変状を瞬時に分かり即時対応が可能となる．2019年度は，次の2点に重点を置いた検討を行った．
(1) ミュ－オン探査装置の設計：本研究では，コーンペネトレーション孔（CPT孔）を利用できる探査装置の開発を目指している．そのためには，直径4cmの孔の中で使用可能な超小型の探査装置を開発する必要がある．2019年度は，その基礎的な設計を行った．
(2) 広域リスク評価のための応答曲面法の検討：広域に存在するため池群のリスク評価を行うためには簡便な解析法の開発が不可欠である．2019年度は，リスク評価に不可欠な，氾濫被害算定を，国が公表している無料のデータに基づいて実施するのスキームの開発を行った． -
Grant number：16H02577 2016.04 - 2020.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)
Nishimura Shin-ichi
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Grant amount：\40560000 （ Direct expense: \31200000 、 Indirect expense：\9360000 ）
The outcome of this project is the development of the inside inspection technique of the earth-fills, and the 3-dimensional finite element modeling system based on the 3D survey system. By the unified techniques, the high accuracy inspection of the earth-fill structures has become available. The risk assessment method has been proposed based on the inspection. The proposed method has made the decision making for the countermeasures against the natural disaster events possible. The concrete items of the outcome are as follows.
(1) Development of the new Swedish Weight Sounding, in which the microphone installed inside to record the sound, and which can move on the slopes; (2) Development of the method of the inspection inside the earth-fills and the grounds based on the sounding, the geophysical survey, and geostatistical simulation; (3) 3D-FEM modeling derived from the 3D geological survey; (4) Model seepage failure tests; (5) Risk assessment of the actual group earth-fill dams. -
Health Monitoring for Infrastructures using Mechanoluminescense
Grant number：15K18759 2015.04 - 2018.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B) Grant-in-Aid for Young Scientists (B)
Shuku Takayuki, NISHIMURA Shin-ichi, SHIBATA Toshifumi
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Grant amount：\3770000 （ Direct expense: \2900000 、 Indirect expense：\870000 ）
Maintenance of aging infrastructures is a growing problem. Cost-efficient maintenance and management of civil infrastructures require balanced consideration of both structural performance and the total cost accrued over the entire life-cycle considering uncertainties. For that purpose, inspection and monitoring techniques for aging existing structures have been proposed.
Mechanoluminescent (ML) can be a useful tool to inspect existing infrastructures.
In this study, the system for measuring ML intensity was newly developed and was applied to unconfined compression test. Measured ML intensity was compared to the applied stress. The relationship between ML intensity and applied stress shows unique curve, and the applied stress can be visually estimated based on ML. -
Grant number：15K07648 2015.04 - 2018.03
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)
Shibata Toshifumi
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Grant amount：\4940000 （ Direct expense: \3800000 、 Indirect expense：\1140000 ）
The maintenance of damaged irrigation tunnels has become a major social concern, and thus the evaluation of damage behavior of the current tunnels is important. Voids behind the tunnel lining may be created during or after construction by the conventional method, and the voids are the main factors for the failure. For the maintenance of the tunnel structure, the understanding of the interaction behavior between the ground and the tunnel lining with the void is required. The comprehension of the interaction after backfilling of the void is also needed because of the design of the reinforcement.
This study presents the interaction behaviors in the model test and the numerical analysis. To investigate the local deformation and the damage pattern, the comparison of the model test results and numerical results is carried out. The comparison of the convergence in the analysis is shown for better understanding of the reinforcement effect of the lockbolts. -
Grant number：25292143 2013.04 - 2016.03
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)
Nishimura Shinichi, FUJISAWA Kazunori, SHUKU Takayuki, MIZUMA Keiji, SHIBATA Toshifumi
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Grant amount：\17030000 （ Direct expense: \13100000 、 Indirect expense：\3930000 ）
In this research, the risk evaluation system has been developed for the maintenance of the agricultural infrastructures such as dams, other irrigation facilities and polder dikes against the severe earthquakes and the heavy rains. The concrete outcomes are as follows. 1) The model test system has been developed to study the liquefaction behavior of the embankment structures, and the mechanism of the liquefaction inside the structures has been clarified. 2) The analytical tools to evaluate the stability against the earthquakes, and the heavy rains, and evaluate the dam breaches and floods, have been developed. 3) The sounding tests and the physical exploration tests have been proposed and their effectiveness has been verified by applying the tests to the in-situ problems. 4) The total risk evaluation system for the optimum maintenance of the agricultural infrastructures has been proposed.
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Grant number：23248040 2011.04 - 2014.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) Grant-in-Aid for Scientific Research (A)
MURAKAMI Akira, NISHIMURA Shinichi, SHIBATA Toshifumi, FUJISAWA Kazunori, NAKAMURA Kazuyuki, SUZUKI Makoto
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Grant amount：\40560000 （ Direct expense: \31200000 、 Indirect expense：\9360000 ）
The data assimilation technique, the numerical model for surface/internal soil erosion and the risk for earthquake damage have been extended and applied to the functional diagnosis for the soil structure as the agricultural facility, e.g., the embankment of irrigation pond. The asset management system for the group of irrigation ponds has been developed combining with the economical concept of asset managament, cost-benefit and public account under the assumption that such facility are social capital/asset supplying the social benefit. This system is extended from the existing the stock management system for agricultural facility and maintains the network of agricultural water use. It can also be applied to the civil and earth resources, e.g., the levee.
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Soil-structure interaction problems of the pole foundation using precast concrete
Grant number：20760318 2008 - 2010
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B) Grant-in-Aid for Young Scientists (B)
SHIBATA Toshifumi
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Grant amount：\2340000 （ Direct expense: \1800000 、 Indirect expense：\540000 ）
In this study, a pole with precast concrete parts is adopted. The mechanical behavior of the pole and the soil has not been clarified because of the uneven shape of the pole foundation. This study aims at clarifying the characteristic of the earth pressure under horizontal and torsional load. Moreover, Element-free Galerkin method with stabilization term is presented for the analysis of the pole foundation. In order to validate the method, some numerical results are given.
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Grant number：20380136 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)
MURAKAMI Akira, NISHIMURA Shinichi, NISHIYAMA Taturou, SHIBATA Toshifumi, FUJISAWA Kazunori, SUZUKI Makoto
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Grant amount：\19760000 （ Direct expense: \15200000 、 Indirect expense：\4560000 ）
This research aimed to establish the system of functional diagnosis for stock management of soil structures using integrated measurements, data assimilation, risk evaluation, and estimation of LCC. The spatial distribution of the strength parameters of decrepit earth-fill dams, and the identification methods of distribution are discussed. Generally, the strength of the earth-fill is predicted from the SPT N-values. While, in this research, the Swedish Weight Sounding Tests (SWS Tests) are conducted to obtain the spatial distribution of the N-values as the simpler method, and the statistical model of the N-values is determined based on the sounding tests. For this task, the Minimizing Akaike's Information Criteria (MAIC) method is employed, and the semi-variogram method is also used to identify the spatial correlation characteristics. The spatial distribution of the N-value is identified from the sounding tests with high resolution, since the point estimations are obtained with short intervals. To interpolate the point estimate values, the indicator simulation method, which is one the geostatistical methods, is employed. In the method, the hard data (primary data) and the soft data (complementary data) can be used simultaneously. Results from the SWS and the Surface Wave Method (SWM), which is one of the geophysical exploration methods, are dealt with as hard and soft data, respectively. With synthesizing two results, the accurate spatial distribution of the N-values can be identified. A computational method, incorporating the finite element model into data assimilation using the particle filter, is presented for identifying deteriorated area within soil structures based on measured data on the settlement and the pore pressure. The effect of improving of the embankment is evaluated in relation to the safety of the embankment against the earthquake and the heavy rain within the framework of the reliability-based design. Risk and the LCC of the soil structures are evaluated from the overall considerations listed above.
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Development of program code for performance based-design of soil structures considering observation during construction and management using GPS and cell phone
Grant number：17380145 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)
MURAKAMI Akira, NISHIMURA Shin'chi, NISHIYAMA Tatsuro, SUZUKI Makoto, SHIBATA Toshifumi, IIZUKA Atsushi
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Grant amount：\16520000 （ Direct expense: \16100000 、 Indirect expense：\420000 ）
A GPS receiver was installed in 2007 at the top of foundation, e.g., the bottom of road embankment to measure the settlement of foundation at the construction site of Yomogida tunnel of the North Kanto Highway project. Soil-water coupled elasto-plastic FEM analyses were carried out to explain the measured behavior and predict the final settlement by examining a set of parameters, initial/boundary conditions, and loading conditions. After comparing the results under different conditions, it is revealed that boundary and loading conditions have less influence on numerical prediction, and initial stress distribution has a significant role. Adjusted parameters based on laboratory tests on samples around the section with examined initial condition lead to numerical prediction of settlement with good accuracy. Management of measured data is done using the work station via cell phones. Soil-water coupled elasto-plastic FEM/mesh-free code is revised to consider the modification of design values within construction.
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Influence of soil conditions on motion and impact force of rockfall on soil slope
Grant number：16560442 2004 - 2006
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)
KAWAHARA Soichiro, SHIBATA Toshifumi
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Grant amount：\2000000 （ Direct expense: \2000000 ）
To investigate the effects of the dry density and thickness of a sand cushion on an impact response due to a falling weight likened to a rockfall, a series of laboratory experiments for a decomposed granite soil was executed in the combination of the mass and drop height of the weight. As a result, the following conclusions were obtained.
●The sinkage of the falling weight and the impact duration decrease with the dry density of the soil ; however, they do not depend on the thickness of the soil.
●The impact acceleration increases with the dry density of the soil ; however, it does not depend on the thickness of the soil.
●The earth pressure at the bottom of the mold increases with the dry density ; and, it deceases with the thickness of the soil.
●The transmission ratio of the impact pressure hardly depends on the dry density of the soil ; however, it decreases rapidly with the thickness of the soil.
●The sinkage of the falling weight having a hemisphere bottom is larger than a flat bottom.
●The impact acceleration of the falling weight having a hemisphere bottom is smaller than a flat bottom. -
Study on impact force on beams
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梁に作用する衝撃力に関する研究
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Geo-disaster prevention （2024academic year） Prophase - 木7～8
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Laboratory Soil and Concrete Mechanics （2024academic year） Fourth semester - 火5～7,金5～7
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Soil Mechanics II （2024academic year） 3rd and 4th semester - 月7～8
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Soil Mechanics II and Exercise A （2024academic year） Third semester - 月7～9
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Soil Mechanics II and Exercise B （2024academic year） Fourth semester - 月7～9
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Geotechnical Engineering for Preventing Disaster （2024academic year） 3rd and 4th semester - 月7～8
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Safety and Security Managements for Engineer （2024academic year） Third semester - 水3～4
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Programming 1 （2023academic year） Third semester - 水1～2
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Programming 1 （2023academic year） Third semester - 水1～2
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Programming 1 （2023academic year） Third semester - 水1～2
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Programming 2 （2023academic year） Fourth semester - 水1～2
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Programming 2 （2023academic year） Fourth semester - 水1～2
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Geo-disaster prevention （2023academic year） Prophase - 木7～8
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Soil Mechanics II and Exercise A （2022academic year） Third semester - 月7～9
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Soil Mechanics II and Exercise B （2022academic year） Fourth semester - 月7～9
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Geotechnical Engineering for Preventing Disaster （2022academic year） 3rd and 4th semester - 月7～8
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Safety and Security Managements for Engineer （2022academic year） Third semester - 水3～4
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Laboratory in Soil and Concrete Mechanics （2021academic year） Fourth semester - 月4,月5,月6,金5,金6,金7
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Programming （2021academic year） 3rd and 4th semester - 水1,水2
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Programming （2021academic year） 3rd and 4th semester - 水1,水2
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Programming 1 （2021academic year） Third semester - 水1,水2
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Programming 2 （2021academic year） Fourth semester - 水1,水2
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Laboratory Soil and Concrete Mechanics （2021academic year） Fourth semester - 月4～6,金5～7
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Geotechnical Engineering for Preventing Disaster （2021academic year） Fourth semester - 木2～4
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Mechanics of Deformable Body I and Exercise （2021academic year） 1st and 2nd semester - [第１学期]火3～4,金7～8, [第２学期]金7～8
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Mechanics of Deformable Body I and Exercise （2021academic year） 1st and 2nd semester - [第１学期]火3～4,金7～8, [第２学期]金7～8
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Safety and Security Managements for Engineer （2021academic year） Third semester - 水3,水4
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Structural Mechanics I and Exercise （2021academic year） 1st and 2nd semester - [第１学期]火3,火4,金7,金8, [第２学期]金7,金8
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Structural Mechanics I and Exercise （2021academic year） 1st and 2nd semester - [第１学期]火3,火4,金7,金8, [第２学期]金7,金8
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Structural Mechanics I （2021academic year） 1st and 2nd semester - [第１学期]火3～4,金7～8, [第２学期]金7～8
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Structral mechanics IA （2021academic year） 1st semester - 火3～4,金7～8
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Structral Mechanics IB （2021academic year） Second semester - 金7～8
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Watershed Geohazard Mechanics （2021academic year） Late - その他
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Introduction of Physics （2021academic year） Second semester - 火3～4,金5～6
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Special Research （2021academic year） Year-round - その他
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Introduction to Environmental & Civil Engineering A （2021academic year） special - その他
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Introduction to Environmental & Civil Engineering B （2021academic year） special - その他
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Basic of Architecture, Civil Engineering and Environmental Management （2021academic year） 1st semester - 水1～2
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Facility Management for Urban and Rural Environments （2021academic year） Prophase - 木5～6
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Seminar on Facility Management for Urban and Rural Environments （2021academic year） Prophase - その他
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Seminar in Management of Environmental Infrastructures （2021academic year） Late - その他
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Seminar on Facility Management for Urban and Rural Environments （2021academic year） Late - その他
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Seminar in Management of Environmental Infrastructures （2021academic year） Prophase - その他
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Laboratory in Soil and Concrete Mechanics （2020academic year） Fourth semester - 月4,月5,月6,木4,木5,木6
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Laboratory Soil and Concrete Mechanics （2020academic year） Fourth semester - 月4,月5,月6,木4,木5,木6
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Laboratory Soil and Concrete Mechanics （2020academic year） Fourth semester - 月4,月5,月6,木4,木5,木6
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Geotechnical Engineering for Preventing Disaster （2020academic year） Fourth semester - 水1,水2,水3
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Geotechnical Engineering for Preventing Disaster （2020academic year） Fourth semester - 水1,水2,水3
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Structural Mechanics I （2020academic year） Third semester - 火6,火7,金6,金7
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Structural Mechanics I （2020academic year） Third semester - 火6,火7,金6,金7
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Watershed Geohazard Mechanics （2020academic year） special - その他
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Introduction of Physics （2020academic year） Second semester - 火4,火5,金4,金5
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Introduction of Physics （2020academic year） Second semester - 火4,火5,金4,金5
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Special Research （2020academic year） Other - [後期], [前期]
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Special Research （2020academic year） Year-round - その他
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Analysis of Environmental Information （2020academic year） Third semester - 月3,木1,木2
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Analysis of Environmental Information （2020academic year） Third semester - 月3,木1,木2
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Facility Management for Urban and Rural Environments （2020academic year） Prophase - 木4,木5
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Seminar on Facility Management for Urban and Rural Environments （2020academic year） Prophase - その他
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Seminar in Management of Environmental Infrastructures （2020academic year） Late - その他
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Seminar on Facility Management for Urban and Rural Environments （2020academic year） Late - その他
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Seminar in Management of Environmental Infrastructures （2020academic year） Prophase - その他