研究者詳細 - 西村　伸一

MISC - 西村　伸一

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Several considerations on a two-dimensional consolidation inverse analysis

S Nishimura, A Murakami, H Fujii

DEFORMATION CHARACTERISTICS OF GEOMATERIALS pp.905-912 905 - 912 2003年

記述言語：英語出版者・発行元：A A BALKEMA PUBLISHERS

A two-dimensional consolidation inverse analysis model is discussed in this paper. The effects of the measured pore water pressure and the assumption of anisotropy are investigated. Firstly, an elasto-plastic hypothetical ground is analyzed to check the proposed analytical method. Secondly, the laboratory anisotropic consolidation tests are analyzed, since accurate measurements are necessary for the development of the method. The measured deformation and pore pressure obtained in the tests are used for the inverse analysis. Finally, the method is applied to an actual soft ground problem to verify the applicability of the method to actual problems.

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双曲線モデルを用いた実測値に基づく軟弱地盤の変形予測

西村伸一, 西山竜朗, 村上章, 村山八洲雄

第48回地盤工学シンポジウム論文集 23 - 28 2003年

Inverse analysis of soft ground considering non-linearity and anisotropy

Prediction and Simulation Methods in Geomechanics, F. Oka et al. eds, Proc. Of IWS-Athens 2003 pp.125-128 2003年

dvection and dispersion analysis in Gaussian and non-Gaussian random field of permeability

Groundwater Engineering - Recent Advances, Kohno et al. eds, Proc of IS-Okayama 2003 pp.597-603 2003年

Gaussian and Non-Gaussian random field simulation of permeability for advection and dispersion analysis

S Nishimura, H Fujii

APPLICATIONS OF STATISTICS AND PROBABILITY IN CIVIL ENGINEERING, VOLS 1 AND 2 pp.1343-1350 1343 - 1350 2003年

記述言語：英語出版者・発行元：MILLPRESS SCIENCE PUBLISHERS

The dispersion behavior of a substance in the ground water flow depends on the random field characteristics of the permeability. In this study, we clarify how the Gaussian and the non-Gaussian random fields of permeability affect the dispersion behavior. The non-Gaussian random field simulation method is newly proposed in this study. The finite difference method (FDM), combined with the Monte Carlo method (MCM), is used in the analysis to solve the advection and dispersion equations. Firstly, a tracer mixed with water is analyzed as a single-phase problem. Then, the migration of the DNAPL pool in the ground water is treated as a two-phase problem.

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Consolidation properties of sludge cakes

S Nishimura, H Fujii, Y Wakitani

Proceedings of the Twelfth Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Vol 1 and 2 pp.183-186 183 - 186 2003年

記述言語：英語出版者・発行元：WORLD SCIENTIFIC PUBL CO PTE LTD

In many cases, the sludge dredged from the bottom of lakes is dewatered, made into sludge cakes, and then broken into pieces. In this study, the mechanical properties of pieces of sludge cakes to be used as banking material are considered. In particular, their consolidation behavior is discussed here. The following specific problem exists in the consolidation of sludge cake pieces. Since the large voids between the pieces shrink and then the inner void in each piece shrinks due to compression, the conventional consolidation theory is not supposed to be applicable. To understand the consolidation characteristics, large-scale consolidation tests were performed. The applicability of the super-subloading Cam clay model, for the compression behavior, and the least squares method, to identify the coefficient of consolidation, were investigated in this study based on the test results.

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等価介在物法による粒状体応力場の逆解析

村上貴志, 村上章, 堀宗朗, 西村伸一

理論応用力学講演会講演論文集 51st 2002年

Reliability-based design of liquefaction

Proc. of Int. Workshop on Foundation Design Codes and Soil Investigation in View of International Harmonization and Performance Based Design pp.313-319 2002年

実測値に基づく二次圧密を考慮した沈下予測

施工過程を考慮した地盤の変形・破壊予測に関するシンポジウム，地盤工学会 pp.77-84 2002年

兵庫県南部地震による北淡町を中心にしたため池被害の要因分析

藤井弘章, 国政華奈, 難波明代, 横溝隆之, 西村伸一, 島田清, 堀俊男, 西山竜朗, 脇谷芳招

環境理工学部研究報告第7巻,第1号,pp.55-74 ( 1 ) 55 - 74 2002年

記述言語：日本語出版者・発行元：岡山大学環境理工学部

This study was performed to clarify which factors affected damage to take-ike (small embankment dams for irrigation in Japanese) of Hokudan Town on Awaji Island in western Japan due to Hyogoken-Nambu earthquake. Multivariate and ordinary statistical analysis were carried out using documentary data (181 damaged and 328 undamaged dams), and ordinary one was done for the results investigated in situ. The model for the multivariate analysis was created with 13 items and 94 categories for 4 groups (Location, Geology Structure, and History of Dam). As a result, the factors causing to damage for dam are (1) the nearest fault (Nojima, Mizukoshi and D2), (2) embankment volume (the larger the more), (3) angle of crest axis to epicenter (diagonal and normal), (4) distance to the nearest fault (less than 500 m), (5) distance to the epicenter (8 to 14 km which almost agree to the location of seismic intensity 7 JMA), (6) play view of dam axis (3 or 4 axes), (7) angle of crest axis to nearest fault (diagonal and normal), (8) elevation of dam site (over 100 m), (9) surface geology of dam site (non-cohesive soil), (10) era of construction (prior to 1891), and (11) soil properties of embankment (constructed of sand, smaller penetration resistance).

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Reliability-based design of liquefaction mitigation by using geostatistical method

Structural Safety and Reliability, Proc. of ICOSSAR'01 CD-ROM 2002年

実測値に基づく二次圧密を考慮した圧密沈下予測

西村伸一, 藤井弘章

農業土木学会論文集 69 ( 6 ) 777 - 785 2001年12月

実測と理論の間で : 逆解析による同定地盤定数の補正法と軟弱地盤の沈下予測

西村伸一

農業土木学会誌 = Journal of the Agricultural Engineering Society, Japan 69 ( 6 ) 88 - 90 2001年6月

軟弱地盤における逆解析結果の補正法と利用法に関する一考察

第46回地盤工学シンポジウム論文集，— 地盤・構造物の変形とその評価 —，地盤工学会 pp.115-118 2001年

浚渫ヘドロ脱水ケーキの一次元圧縮試験

脇谷芳招, 藤井弘章, 西村伸一

環境理工学部研究報告第6巻,第1号,pp.85-97 ( 1 ) 85 - 97 2001年

Compression characteristics of sludge cake

Journal of Faculty of Environmental Science and Technology, Okayama University , Special Edition pp. 147-156 2001年

現場試験による液状化強度の評価と信頼性設計への適用

西村伸一, 清水英良, 藤井弘章, 島田清

環境理工学部研究報告 5 ( 1 ) 145 - 151 2000年

記述言語：日本語出版者・発行元：岡山大学環境理工学部

A calculation method of probability of liquefaction is proposed in this paper. The spatial variability of soil parameters for the dynamic shear strength, i.e., N-values, median grain size, fines contents, and the statistical characteristics of the earthquake frequency are considered in the analysis. The standard penetration test (SPT) is convenient to estimate the spatial variability of the dynamic shear strength and mainly used in this study. Furthermore the determination of dynamic shear strength based on Swedish weight Sounding test also introduced here, because it is the simpler test than SPT. While the statistical model of the earthquake frequency is determined based on the record of historical earthquakes. Using this method the probability of liquefaction is calculated. The sand compaction pile method is considered for the ground improvement against the liquefaction. Finally, the relationship between the sand replacement rate and the probability of liquefaction is clarified.

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Consolidation inverse analysis using pore water pressure measurement

S Nishimura, H Fujii, K Shimada

COASTAL GEOTECHNICAL ENGINEERING IN PRACTICE, VOL 1 pp. 101-106 101 - 106 2000年

記述言語：英語出版者・発行元：A A BALKEMA PUBLISHERS

The consolidation inverse analysis is carried out in this study by using not only settlement measurement but also pore pressure measurement. A stochastic nonlinear consolidation model (SNCM) is applied to the one-dimensional analysis. The SNCM represents the non-linearity and spatial variability of the coefficient of volume compressibility and the coefficient of permeability at the same time. The method is applied to a model test result, and the effect of pore pressure measurement on the prediction of consolidation behavior is verified. Furthermore, a two-dimensional consolidation inverse analysis is performed by using triaxial anisotropic consolidation test results.

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Compression characteristics of sludge cake

H Fujii, S Nishimura, Y Wakitani, T Inoue, O Seino, N Nishino

COASTAL GEOTECHNICAL ENGINEERING IN PRACTICE, VOL 1 pp. 587-592 587 - 592 2000年

記述言語：英語出版者・発行元：A A BALKEMA PUBLISHERS

The laboratory consolidation tests were performed to investigate the compression characteristics of the dewatered sludge as a construction material. The sludge is dredged from the bottom of a lake. After the dehydration, it is broken into fragments. The fragments shows different compression behavior from that of ordinary undisturbed clay. The remarkable point in our research is: The e similar to log p curves of fragments have two kinds of compression index in the normally consolidation region. The first compression index has linear relation with initial water content, while the second one is almost constant.

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Stochastic non-linear consolidation model and its application to back analysis of soft ground,Application of Statistics and Probability

Proc. of ICASP8 445 - 452 1999年

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