| Project/Area Number |
10650479
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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 | Tokyo Institute of Technology |
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Principal Investigator |
KUWANO Jiro Tokyo Institute of Technology, Graduate school of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (30178149)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Akihiro Tokyo Institute of Technology, Graduate school of Science and Engineering, Research Associate, 大学院・理工学研究科, 助手 (40293047)
KODA Masayuki Railway Technology Research Institute, Engineer, 構造物技術開発事業部, 技師(研究職) (10282823)
TAKEMURA Jiro Tokyo Institute of Technology, Graduate school of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (40179669)
GOTO Satoshi Yamanashi University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80303395)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Anisotropy / geomaterials / deformation characteristics / bender element / shear wave velocity / stress-state dependency / small strain / 三軸試験 / 中空ねじり試験 / LDT / LVDT |
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| Research Abstract |
In this study, a triaxial test apparatus which is composed of a triaxial cell with automated control and measurement system together with measurement units for shear wave velocities is newly developed for the measurements at small strain level. Stability and errors of the system were first evaluated. Stiffness and anisotropy of Toyoura sand at small strain level were measured by performing triaxial tests with small cyclic loading and shear wave shear wave velocity measurement. The results were compared with the results obtained by hollow cylindrical torsion shear tests.
If internal measurements were made to avoid bedding error, both LDT and LVDT gave the similarly accurate axial strain values. Errors in volume change measurements should be corrected not only for membrane penetration on the side of the specimen but also for other system compliance. Corrections were also wade for the bedding error at lubrication layer and the gaps between the membrane and endplates. In this test series, enlarged plates were used both at a top cap and a pedestal for lubrication, and the membrane could not be perfectly fit at the corner of the specimen and the plate. Errors in volume change measurements were found to change linearly with the logarithm of the effective confining pressure. It was checked that the small strain stiffness could be determined precisely at a very small strain level of 10^<-5>, if the corrections were made properly.
Stiffness and anisotropy of Toyoura sand at small strain level were measured by performing triaxial tests with small cyclic loading and shear wave shear wave velocity measurement. Preliminary test results are presented and compared with the results obtained by hollow cylindrical torsion shear tests. Stress state dependency of small-strain stiffness is discussed.
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