降雨条件下边坡角度对边坡稳定性影响的数值模拟研究

近年来，降雨所导致的边坡失稳越来越频繁，引起了越来越多专家的重视，因此对降雨条件下边坡角度对边坡稳定性的数值模拟研究无论在理论上还是在工程应用上都具有十分重要的意义。影响边坡稳定性的因素有很多，本文利用数值分析方法研究了降雨时间、边坡角度两个因素对边坡稳定性的影响，比较了降雨历时、边坡角度在降雨过程中对边坡稳定性安全系数的影响。模拟结果表明：相同的降雨强度，相同降雨时间、边坡角度越小，安全系数下降的越快，土中孔隙水压力变化越快。虽然其初始位移较小，但是随着降雨的持续，其位移将越来越大，边坡稳定性降低地越来越快； 坡内经历非稳定渗流、非稳定渗流与稳定渗流和稳定渗流3个过程。该研究结果有助于深入认识降雨引发滑坡的机制，可为治理此类滑坡提供科学依据。

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.