The Effect Of Rainfall Condition On Infiltration And Stability Of Soil Slope

The stability problem of dams and slopes under rainfall involves not only the saturated-unsaturated seepage law, but also the effect of water content changes on the intensive parameter of unsaturated soil. Aiming at different the soil characteristics, the seepage and stability of slope under rainfall is analyzed. Based on the saturated-unsaturated seepage theory and rainfall infiltration theory, change law of seepage fields is analyzed. On the basis of calculated transient seepage field and the shear strength theory of unsaturated soil, the transient stability of slope is analyzed. The main conclusions are as follows:The saturated-unsaturated seepage theory under rainfall condition and the governing equation of unsaturated seepage are introduced. The boundary conditions are attained.The governing equations of the FEM are deduced under rainfall condition and a lot of problems of FEM program are discussed. The affected mechanics of rainfall infiltration to the slop stability is expounded.Aiming at the different soil property, the seepage field under different rainfall intensity, different duration, different rainfall form and the antecedent rainfall are calculated by adopting FEM model of simple earth dam. The transient safety factor after the rainfall is obtained according to the results seepage field. Some useful conclusions are obtained.