| Project/Area Number |
01460192
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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 |
Building structures/materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
KISHIDA Hideaki Tokyo Institute of Technology, Professor, The Graduate School Department of Environmental Engineering, 大学院・総合理工学研究科, 教授 (30016513)
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| Co-Investigator(Kenkyū-buntansha) |
TSUBAKIHARA Yasunori Tokyo Institute of Technology, Research Associate, The Graduate School at Depart, 大学院・総合理工学研究科, 助手 (10217367)
UESUGI Morimichi Chiba University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20151780)
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| Project Period (FY) |
1989 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1990: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1989: ¥3,300,000 (Direct Cost: ¥3,300,000)
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| Keywords | Friction / Pile / Bearing Capacity / In-situ Test |
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| Research Abstract |
Experimental tests were carried out to study the possibility of estimating the frictional factor of the bearing capacity of piles with the use of a Lateral-stress-sensing cone penetrometer.
1. The characteristics of lateral stress acting of the cone penetrometer in sandy soil were examined with the results of the friction tests in pressurized artificial grounds and inーsitu tests at reclaimed grounds.
The change of horizontal stress was measured during the penetration of the cone penetrometer into the pressurized artificial ground. The relative density of the sand was found to be influential to the lateral stress acting on the friction sleeve. The results of in-situ tests at reclaimed sandy grounds showed that the location of the pore water pressure transducer has an important role on the test results.
In-situ friction tests were carried out at soft and stiff clayey grounds, Frictional resistance from the cone penetration tests were studied in comparison with the frictional resistance from the loading tests of piles.
From the test results in the soft clayey ground, it was found that neither the location nor the roughness of friction sleeve has evident influence on the frictional resistance measured by the cone penetrometer. From the test results in the stiff clayey ground, it was found that the frictional resistance measured by friction sleeve is closer to the frictional resistance from the loading tests of piles than the value estimated from the point resistance of the cone penetrometer.
3. Problems were identified on the apparatus and procedure of the in-situ tests by the lateral-stress-sensing cone penetrometer. It will become necessary to solve these problems to establish a concrete method for estimating the frictional resistance of piles from the results of cone penetration tests.
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