| Project/Area Number |
14350254
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | University of Yamanashi |
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Principal Investigator |
GOTO Satoshi University of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Associate Professor, 大学院・医学工学総合研究部, 助教授 (80303395)
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| Co-Investigator(Kenkyū-buntansha) |
KAZAMA Motoki Tohoku University, Graduate school of Engineering, Professor, 大学院・工学研究科, 教授 (20261597)
HATANAKA Munenori Chiba Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (60333019)
KOKUSHO Takaji Chuo University, Faculty of Science and Engineering, Professor, 理工学部, 教授 (80286955)
NUMATA Atsunori Tobishima Corporation, Research Center, Chief Engineer, 技術研究所, 課長(研究職)
KIKU Hiroyoshi Kanto Gakuin University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (70251759)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥5,500,000 (Direct Cost: ¥5,500,000)
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| Keywords | Liquefaction / gravel / Dense sands / Level II earthquake motion / Standard penetration test / liquefaction criteria / Undisturbed sample / Dynamic behavior |
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| Research Abstract |
The purpose of this study is to consider the liquefaction properties of gravelly soils and dense sands during level II earthquake motion and to propose highly accurate present-liquefaction criteria or newly developed liquefaction criteria. Following results were obtained:
1.Liquefaction properties of gravelly soil and dense sand deposits
Liquefaction properties of gravelly soils and dense sands were considered by using undisturbed freezing sample of the Kuzuryu and Edo River sand in laboratory liquefaction tests.
2.Scattering reason of liquefaction strength and N-value for gravelly soils and dense sands
Different liquefaction strengths were obtained among almost the same sample with similar N-value and fine contents from the liquefaction tests of undisturbed samples. This may be due to the accuracy of N-value, incorrectness using fine contents to evaluate the viscosity and so on, but the aging effects like cementation may be one of the moss important factors to evaluate the in-situ liquefaction strength.
3.Proposal of newly developed liquefaction criteria
As the process to reach the liquefaction stage is also important properties, newly developed liquefaction criteria using an index to show the continuous properties of soils during the earthquake were proposed.
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