降雨条件下非饱和黄土边坡数值模拟研究
Numerical Simulation Study of Unsaturated Loess Slope under Rainfall Conditions

基于Abaqus有限元数值模拟软件，根据试验所得的数据建立起降雨条件下二维边坡的有限元分析模型。在降雨时长为120 h的前提下，设置降雨强度分别为10 mm/h、15 mm/h、20 mm/h，分析了斜坡的变形特征及渗流特征。结果表明，坡体的等效塑性变形随雨强度的增加而增大，最大塑性应变为0.04，有向坡底偏移的趋势；水平位移也不断增大，最大位移为64.62 mm；与此同时，由于坡脚处的积水增多，坡脚处的孔隙水压力值也在持续增加，最大值为41.02 kPa；边坡安全系数不断减小，最小值为1.025，边坡稳定性降低。
Based on the Abaqus finite element numerical simulation software, a finite element analysis model of two-dimensional slope under rainfall conditions is established according to the data obtained by the experiment. Under the premise of rainfall duration of 120 h, the rainfall intensity was set to 10 mm/h, 15 mm/h and 20 mm/h, respectively, and the deformation characteristics and seepage characteristics of the slope were analyzed. The results show that the equivalent plastic deformation of the slope increases with the increase of rain intensity, the maximum plastic strain is 0.04, and there is a tendency to shift to the bottom of the slope, the horizontal displacement also increases, the maximum displacement is 64.62 mm, at the same time, due to the increase of water at the foot of the slope, the pore water pressure value at the foot of the slope is also increasing, and the maximum value is 41.02 kPa. The slope safety factor is constantly decreasing, the minimum value is 1.025, and the slope stability is reduced.