| Project/Area Number |
13650544
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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 | Yamaguchi University |
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Principal Investigator |
HYODO Masayuki Yamaguchi University, Faculty of Engineering, Professor, 工学部, 教授 (40130091)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMOTO Norimasa Yamaguchi University, Faulty of Engineering, Research Associate, 工学部, 助手 (00325242)
NAKATA Yukio Yamaguchi University, Faulty of Engineering, Associate Professor, 工学部, 助教授 (90274183)
MURATA Hidekazu Yamaguchi University, Faulty of Engineering, Professor, 工学部, 教授 (80044618)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | on line seismic response test / stratified ground / sand layer / liquefaction / clay layer / degree of consolidation / response characteristics / deformation / 地盤改良 / 粘性土 / 地震時安定性 / 塑性指数 |
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| Research Abstract |
Since soft clay ground layers both amplify and attenuate ground motion, the effects of the nonlinearity on the earthquake response of the ground surface needs to be understood. Another phenomenon that notably attenuates ground motion is liquefaction of sandy layers. Liquefied ground shows drastic drops in stiffness, impedes propagation of shearing waves to upper layers, and thus reduces the earthquake response acceleration. Typical examples of attenuated earthquake motion by liquefaction were seen during the 1995 Hyogo-ken Nanbu Earthquake. During this earthquake, liquefaction occurred and caused various degrees of damages to port facilities and reclaimed artificial islands. In Japan, seismic design standards for various structures have been revised after this earthquake. On-line pseudo-dynamic response tests were performed on the alternating layers of clay and sand in order to precisely investigate the effects of the degree of consolidation of clay on the vibration properties of the alternating layers in the present study. Tests were also conducted by changing the thickness and order of the clay layer to investigate the effects of the clay layer on the liquefaction and earthquake response characteristics of the alternating layers
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