NUMERICAL SIMULATION STUDY OF SLOPE INSTABILITY CAUSED BY ANGLE OF SLOPE UNDER RAINFALL

In recent years, the slope instability caused by rainfall infiltration more and more frequently, and more and more experts attach importance to this subject. As a result, numerical simulation study of slope instability caused by angle of slope under rainfall is of great importance both in theory and application to engineering. In this paper, there are two factors, duration of rainfall and the different angle of slope, which affect the stability of slope are studied based on numerical simulation. According to the characteristics of sand used in the construction site, the angle of rainfall on the course of the effects of slope stability safety factor. The results show that under the same rainfall intensity, the same rainfall time, the smaller angle of slope is,the latter and faster the safety factor declines, the greater change in soil pore water pressure, Finally, the displacement of soil will enhance, the stability of slope will decrease. There are three processes including the unsteady seepage, the unsteady seepage and the steady seepage, steady seepage inside the slope. The numerical simulation results can provide an improved understanding of the physical behavior and failure mode of soil slopes subjected to rainfall.