2013 Fiscal Year Final Research Report
A study on the establishment of landslide early warning system against torrential rainfall in Indochina region
| Project/Area Number |
23404011
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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 | 海外学術 |
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| Research Field |
Geotechnical engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
OHTSU Hiroyasu 京都大学, 工学(系)研究科(研究院), 教授 (40293881)
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| Co-Investigator(Kenkyū-buntansha) |
TACHIKAWA Yasuto 京都大学, 工学研究科, 教授 (40227088)
KOBAYASHI Akira 関西大学, 工学部, 教授 (80261460)
INAZUMI Shinya 明石工業高等専門学校, その他部局等, 講師 (90362459)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 地盤工学 |
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| Research Abstract |
In this study, field monitoring focusing on water mass balance due to torrential rainfall in the slope comprising weathered granite, which is dominate landslide-prone geological condition in Indochina Peninsula, has been conducted. The results showed that precipitation is divided into runoff, infiltration into subsoil and surface retention, which is generated by ink-bottle effect in unsaturated soil near slope surface. And, the results of FEM unsaturated-saturated seepage analysis, in which calculated infiltration into subsoil is treated as prescribed boundary condition considering the effect of surface retention, showed good agreement with that of measurement. In addition, as for mechanism of shallow landslide, it is pointed that the decrease of effective cohesion due to increase of degree of saturation may be the trigger of slope failure without generation of groundwater table.
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