2006 Fiscal Year Final Research Report Summary
Study of shear bands and prediction of compaction and failure in the strain localization behavior of geomaterials
| Project/Area Number |
16360238
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
OKA Fusao Kyoto University, Graduate school of Engineering, Professor, 工学系研究科, 教授 (10111923)
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| Co-Investigator(Kenkyū-buntansha) |
KIMOTO Sayuri Kyoto University, Graduate school of Engineering, Associate Professor, 工学系研究科, 助教授 (70362457)
KODAKA Takeshi Meijo University, Faculty of Science and Technology, Associate Professor, 理工学部, 助教授 (00252271)
YASHIMA Atsushi Gifu University, Faculty of Engineering, Professor, 工学部, 教授 (90144394)
OTANI Jun Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (30203821)
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| Project Period (FY) |
2004 – 2006
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| Keywords | compaction bands / strain localization / X-ray CT / diatomaceous mudstone / elasto-viscoplastic model / shear bands / sensitive clay / triaxial test |
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| Research Abstract |
ABSTRACT: Strain localization problems such as shear bands and slip surfaces are very important because those are precursor of failure. Hence many researchers have been studying for the last 30 years. On the other hand, compaction bands have been studied in recent years for the analysis of large settlement of off shore structures. In fact, experimental work on porous geomaterials has been done from 90s. A series of triaxial compression tests under the drained conditions was performed on diatomaceous porous rocks. A rectangular-shaped prismatic specimen was used to easily measure the strain distributions on the specimen surface. The distributions of local strain, i.e., shear strain, axial strain, and volumetric strain, were measured on the surface of the specimen by using an image analysis technique newly developed for this experiment. After the shear testing, the changes in density of the specimen were measured by an X-ray CT scanner. Some high density regions were found to correspond to the compaction bands observed in the image analysis in the cases of relatively high confining pressure levels. Then, we have carried out a numerical simulation of sensitive clay using an elasto-viscoplastic model with structural degradation based on the finite deformation theory, and we have found the compressive strain localization during the consolidation process. In addition, using the same model, numerical simulations of consolidation of soft clay and drained triaxial tests of diatomaceous mud stone have been carried out to study the compressive localization, namely, compaction bands and strain localization of geomaterials was discussed.
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Research Products
(30 results)
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[Journal Article] Experimental study of compaction bands in diatomaceous porous rock2006
Author(s)
小高猛司, 岡二三生, 北原秀樹, 太田浩史, 大谷順
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Journal Title
Advances in X-ray tomography for geomaterials, GeoX2006, Aussois, France, Oct. 4-7, Jacques Desrues, iSTE (Gioacchino Viggiani and Pierre Bessulle, eds.)
Pages: 185-191
Description
「研究成果報告書概要(和文)」より
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