| Project/Area Number |
61850104
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Building structures/materials
|
|---|
| Research Institution | Tokyo Institute of Technology |
|---|
Principal Investigator |
YOSHIMI Yoshiaki Profrssor, Tokyo Institute of Technology, 工学部, 教授 (90016329)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
HATANAKA Munenori Research Engineer, Takenaka Komuten Co., Ltd., 技術研究所, 研究員 (60333019)
TOKIMATSU Kohji Associate Professot, Tokyo Institute of Technology, 工学部, 助教授 (50134846)
|
|---|
| Project Period (FY) |
1986 – 1987
|
| Project Status |
Completed (Fiscal Year 1987)
|
| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1987: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1986: ¥4,700,000 (Direct Cost: ¥4,700,000)
|
|---|
| Keywords | Liquefaction / Shear ware velocity / Gravel / Sand / Earthquake / システムコンプライアンス |
|---|
| Research Abstract |
We developed a system for conducting undrained cyclic shear tests on gravel that can eliminate system compliance on a real time basis. By comparing the test results with the resuts of analysis is was shown taht the system can effectively perform the tests with sufficient accuracy. We also proposed based on the test results a simple method to correct fot the system compliance.
A series of laboratory tests were conducted to obtain the shear modulus at small shear strain and the undrained cyclic shear strength (liquecation resistance) using a cyclic triaxial test apparatus. Based on the tests in which the density, the confining stress ans the kins of sands were varies, is was shown thar (1) good correlation existed between thr shear modulus and the liquecation restance for the same sand under the same confining stress, but (2) such correlation did not always exist if the kind of sand and confining stress were varied.
To eliminate the effect of the kind of sans and the confining stress, we defined a normalized shear modulus incorporating minimum void ratio and confining stress. The liquefaction resistance and the normalized shear modulus were well correlated regardless of the density and the kins of sand as well as the confining stress.
A method was proposed to predict the liquecation resistance of gravel from its shear wave velocity. The validity of the method using the normalized shear modulus was confirmed besed on tests on high-quality undisturbed samples of gravel obrained by in situ freezing.
|
