Analysis of the formation mechanism of shallow landslides in the clastic rock area of Guizhou under the action of rainfall seepage
Landslide geological disasters in Guizhou Province are mostly developed in clastic rock areas,and rainfall is the main triggering factor.Studying the relationship between the formation mechanism of landslides in clastic rock areas and rain-fall seepage is of practical significance for disaster prevention and reduction.This article takes the Zheyang landslide in Xingyi,Guizhou as an example.Based on on-site investigation and data collection,the geological structure characteristics of the landslide were analyzed,and a numerical model was constructed.By overlaying the seepage analysis results under different rainfall intensities and drainage conditions,the Fredlund bivariate unsaturated soil shear strength theory and Janbu method were used to calculate the landslide stability coefficient.The relationship between landslide stability and rainfall intensity and drainage conditions was obtained,revealing the formation mechanism of shallow landslides in clastic rock areas under rainfall seepage.Research shows that with the increase of rainfall intensity,the stability of landslides decreases more significantly and the rate of decline accelerates.At the same time,when the drainage of infiltrated rainwater is obstructed,the stability coeffi-cient of the landslide will further decrease.The research results can provide reference for the stability analysis and treatment of similar landslides.
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