1994 Fiscal Year Final Research Report Summary
Experimental and analytical Study on Three-dimensional Bearing Capacity of Soft Rock Ground.
| Project/Area Number |
05452237
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geotechnical engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
TOKI Shyosuke Hokkaido Univ., Fac.of Eng., Professor, 工学部, 教授 (50001136)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIMURA Migitoshi Hokkaido Univ., Fac.of Eng., Instructor, 工学部, 助手 (60250487)
MIURA Kinya Hokkaido Uni, Fac.of Eng., Associate Professor, 工学部, 助教授 (40190582)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Shallow Foundation / Bearing Capacity / Model Test / Soft Rock / Failure Mechanism / Panting Shear / Repeated Load / Subgrade Reaction Coefficient |
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| Research Abstract |
In order to investigate the bearing capacity characteristics of soft rock, loading test of model circular footing was carried on the artificial soft rock. In this study, Preparation method of Soft Rock test Ppparatus were developed.
Three types of loading tests were performed : monotonic loading test, cyclic loading test and excavation loading test. The observed behavior of the footing and the ground showed that the soft rock ground failed in punching shear type under the monotonic loading. The yielding stress is not recognized in the monotonic loading test. In the excavation test the soft rock ground showed the clear yielding feature, and the typical general shear failure was recognized.
From the observation of the vertical section of soft rock ground, the follouings were revealed. The yielding-deformation characteristics and the failure mechanics were investigated.
The local compressed densified zones generate at the verge of the footing and merge at the beneath the footing ; the densified zone extends downward. At the same time the crack generates from the verge of the footing. In the excavation loading the general shear failure was shown due to the elimination of the confinement by the mass over the footing base. In the loading test of the circular footing on the step of the soft rock ground, also the typical general shear failure was observed.
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