| Project/Area Number |
05555133
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| Research Category |
Grant-in-Aid for Developmental 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 | Tokyo Institute of Technology |
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Principal Investigator |
TAKEMURA Jiro Tokyo Institute of Technology, Associate Professor Faculty of Engineering, 工学部, 助教授 (40179669)
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| Co-Investigator(Kenkyū-buntansha) |
KITAZUME Masaki Port and Harbor Research Institute, Chief Researcher, 土質部, 地盤改良研究室長
OKAMURA Mitsu Tokyo Institute of Technology, Research Associate Faculty of Engineering, 工学部, 助手 (50251624)
HIROOKA Akihiko Tokyo Institute of Technology, Research Associate Faculty of Engineering, 工学部, 助手 (70238400)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 1994: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1993: ¥7,500,000 (Direct Cost: ¥7,500,000)
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| Keywords | under ground structure / buoyant forces / depth of cover / loading rate / sand / uplift force / 浮き上がり量 / 引き上げ荷重 / 土被り厚さ |
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| Research Abstract |
Because of shortage of land space, coastal areas in Japan have been developed and scale of structures become larger and larger in recent years. Large under ground structures in areas of high ground water table might be subjected to large buoyant forces. In this study a series of centrifuge tests were carried out to investigate the influences of depth, size, shape, and flexibility of under ground structures and loading rate on the stability of ground. Stability analyzes are also carried out by using the upper bound method and finite element method. Following conclusions were found ;
(1) The ultimate uplift capacity of structures in sand increases rapidly with increasing in a ratio of depth of cover to width of structures. Calculated ultimate capacity from limit equilibrium method using observed failure mechanism agree well with that measured.
(2) A flexibility of tunnel influences considerably on circumferential stress of tunnel lining ; relatively flexible tunnel could increase its width horizontally, which results in relatively uniform circumferential stress distribution while circumferential stress concentrates on around springline of rigid tunnel.
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