Numerical Simulation of Stability Analyzing for Unsaturated Slope with Rainfall Infiltration

Rainfall infiltration exerts great effect on the stability of soil slopes. Based on the actual rainfall data, saturated-unsaturated seepage theory and the mechanical theory of unsaturated porous media, numerical simulations were conducted to examine the seepage field of saturatedunsaturated slope during rainfall infiltration in this paper. The influence of the coefficient with rainfall duration, rainfall patterns, rainfall intensity and soil saturated permeability on seepage field are studied, and the relationship between the factor of safety and the position of sliding surface is obtained. The simulated results show that the saturated hydraulic conductivity has a great effect on slope stability. If the permeability of soil is relatively large, the changing range and the velocity of the factor of safety increase with the rainfall intensity; and if it is relatively in a low degree, the influence of the rainfall intensity on the slope stability is also low.