With Majiacun landslide as an example

finite element method is employed to analyze the transient unsaturated seepage field existing in the residual slope deposit slope under rainfall infiltration and limit equilibrium technique is employed to analyze the seepage stability in this deposit slope.It analyzes the slope structure

free face

effects of rainfall on slope deformation and stabilization

as well as the process of predicting rainfall-induced landslides in residual soil slope.It is believed that the mechanism of rainfall-induced residual slope deposit landslide is:rainfall infiltration creates a weak layer in the residual slope deposit slope;toe excavation produces tensile cracks in the slope face;rainfall fills the slope cracks with water

causes slope soil saturation

reduces the shear strength

and generates hydrodynamic pressure

forms negative effect on the slope stabilization;when the slope sliding force is stronger than anti-slide force

the slope slides.