| Project/Area Number |
18560489
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Tohoku Gakuin University |
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Principal Investigator |
YOSHIDA Nozomu Tohoku Gakuin University, Department of Civil and Environmental Engineering, Professor (50405891)
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| Co-Investigator(Kenkyū-buntansha) |
TOBITA Yoshio Tohoku Gakuin University, Department of Civil and Environmental Engineering, Professor (40124606)
YAMAGUCHI Akira Tohoku Gakuin Uniiversity, Department of Civil and Environmental Engineering, Associate professor (30337191)
KIKU Hiroyoshi Kanto Gakuin University, Department of Civil and Environmental Engineering, Professor (70251759)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,040,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2006: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | liquefaction / liquefaction-induced flow / Earth pressure / Non-liquefied layer / Earthquake / Remedial measures / Three dimension |
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| Research Abstract |
Behavior of surface unliquefied soil that moved as a soil block during liquefaction-induced flow is obtained under the tensile loading condition. Both fresh test and stage test are made by means of hollow torsional shear test apparatus. It is found that tensile strength is about 1110 of the compressive strength even under the cyclic loading. In addition, although there are some difference between fresh and stage test at small strains, there is no difference between them at large strains. These two results indicate that effect of loading history can be neglected in evaluating tensile behavior of surface unliquefied soil.
Load acting on the structure during the liquefaction-induced flow is evaluated numerically considering the three dimensional behavior. This force is compared with the horizontal force that is considered in the conventional design such as inertia force. A case study is made using the soil profile at Port Island where significant liquefaction-induced flow occurred. The calculation is made with the size of the structure as parameter. It is found that horizontal force considered in the conventional design is larger that the force caused by liquefaction-induced flow if the cross-sectional shape is dose to square, but the latter becomes larger when width-depth ratio increase& It indicates that remedial measure against liquefaction-induced flow must be re-considered.
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