Abstract
In order to analyze the causes and mechanism of rainfall induced landslide, Taking sihong landslide in guangxi as an example, finite element method (FEM) and the theoretical calculation were adopted, it respectively analyzes the stability of the landslide in the natural state and rainfall conditions, the influence factors of landslide are analyzed and evaluated the landslide stability. The research results show that the disaster mechanism of Sihong landslide is due to the strong permeability of clay layer, and the weathering layer is into water easyly soften, and the rainfall infiltration is easy to form a weak interlayer, which induces local deformation and finally slides. Sihong landslide is in a stable state under natural conditions. However, landslide was in the unstable state under the saturated condition. According to the plastic cloud map of the sliding surface, dangerous area of stress was concentrated in the front edge of the landslide, so it is suggested to take prevention measures of double-row anti-slide piles and the masonry slope. The formation mechanism of the landslide can provide engineering reference for similar project.
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