2002 Fiscal Year Final Research Report Summary
Predicting system of Shirasu slope failure in southern Kyushu
| Project/Area Number |
12792009
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| Research Category |
Grant-in-Aid for University and Society Collaboration
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| Allocation Type | Single-year Grants |
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| Research Field |
Geotechnical engineering
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| Research Institution | Kagoshima University |
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Principal Investigator |
KITAMURA Ryosuke Kagoshima University, Faculty of Engineering, Professor, 工学部, 教授 (70111979)
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| Co-Investigator(Kenkyū-buntansha) |
KOJIMA Naohito Tokyo Science Unv., Science and Tecnology, Asso. Professor, 理工学部, 助教授 (00205387)
TOMITA Katsutoshi Kagoshima University, Faculty of Science, Professor, 理学部, 教授 (20041220)
KOBAYASHI Tetsuo Kagoshima University, Faculty of Science, Associate Professor, 理学部, 助教授 (70112430)
OCHIAI Hidetoshi Kyushu University, School of Engineering, Professor, 大学院・工学研究院, 教授 (00039679)
YAMAMOTO Kentaro Kagoshima University, Faculty of Engineering, Research Associate, 工学部, 助手 (40305157)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Prediction of slope failure / Field measurement / Unsaturated Shirasu / Suction / Remote sensing / Numerical & mechanical model / Probability of slope failure / Weathering matters |
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| Research Abstract |
This research aims to predict the place time and scale of slope failures due to rainfall in the southern part of Kyushu Island. The research project is mainly divided into three parts, i.e., (1) the in-situ and laboratory tests to make clear the inherent causes of slope failure due to rainfall, (2) field measuring system to acquire the information of rainfall, suction and temperature in soil that relate to the induced causes due to rainfall, and (3) numerical models to simulate the slope condition concerning the water content.
To identify the dangerous places of slope failure the remote sensing technology was applied with the quantitative theories. The X ray reflection method was used to investigate the weathering process. The chemical analysis of pyroclastic flow deposits made clear the order of eruptions and sediments around Kagoshima Bay area.
The field measurement of rainfall, suction and temperature in soil made clear the process of infiltration of rain and evaporation of pore water on Shirasu slope.
The numerical experiments were carried out to simulate the condition of slope concerning the water content and proved the validity of numerical models which developed for this research.
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