| Project/Area Number |
09650550
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
MIMURA Mamoru Kyoto Univ.Disas.Prev.Res.Inst.Assoc.Prof., 防災研究所, 助教授 (00166109)
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| Co-Investigator(Kenkyū-buntansha) |
KATSUMI Takeshi Kyoto Univ.Disas.Prev.Res.Inst.Res.Assoc., 防災研究所, 助手 (60233764)
KAMON Masashi Kyoto Univ.Disas.Prev.Res.Inst.Professor, 防災研究所, 教授 (40026331)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
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| Keywords | ALE / Finite Element Method / CPT / Localization of Deformation / Stress Concentration / Plastic Shear Strain / Large Deformation Problem / Finite Strain |
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| Research Abstract |
CPT is widely used for subsoil investigation. However, the mechanism of penetration process has not rationally been explained because this problem is one of the most difficult boundary value problems with large deformation around cone. Eulerean finite element method has successfully been applied to the analysis of the process of cone penetration. The problem with respect to the element distortion can be avoided if the material displacement increments are uncoupled from the grid point displacement increments. Performance in clay as well as sand deposits is discussed. Undrained analysis was used for clay based on the fact that the process of penetration in clay deposits can be considered as a phenomenon under perfectly undrained condition. In-situ CPT at Kinkai Bay site was selected to validate the calculated performance for CPT in clay deposit. On the other hand Higashi Ogishima reclaimed sand deposit and Kemigawa Pleistocene sand deposit are selected as representatives for sandy deposits. Far from the case of clay deposit, fully drained condition is satisfied for the process of penetration in sandy deposit. Dilatancy effect is also introduced into the numerical assessment. For both clay and sand deposits, the calculated performance can describe the in-situ cone tip resistance well, and shows the significant stress build-up and large strain around cone due to penetration. Furthermore, even in the frictional materials such as sand, the affected area in terms of plastic deformation is found to be localized in the vicinity of cone shaft.
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