A study on the establishment of landslide early warning system against torrential rainfall in Indochina region

点击翻译按钮获取中文摘要

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.