为了研究降雨条件下基底倾角对排土场边坡稳定性的影响，根据朔州市某露天煤矿的实际情况，利用FLAC^3D软件对排土场边坡进行同等雨强条件下不同基底倾角的数值模拟。结果表明：在降雨初期，排土场边坡表层的饱和度先快速增长并趋于非饱和的稳定值；随着降雨入渗至弱层和基岩交界处时，雨水在重力作用下向坡脚处堆积并导致坡脚处发生剪切破坏；随着基底倾角的增加，各监测点达到饱和或稳定状态出现明显的时间滞后效应，且位移量和应变增量的变化与基底倾角呈正相关关系。

In order to study the influence of basement inclination on the stability of the dump slope under rainfall conditions, according to the actual situation of Antaibao Open-pit Coal Mine, FLAC^3D software was used to simulate the slope of the dump under the same rain intensity and different base inclination angles. The results show that in the early stage of rainfall, the saturation of the surface layer of the dump slope first grows rapidly and tends to the stable value of unsaturation, and when the rainfall infiltrates to the junction of the weak layer and bedrock, the rainwater accumulates at the slope angle under the action of gravity and leads to shear failure at the slope angle. With the increase of the basement inclination, the time lag effect occurred in each monitoring point when it reached saturation or steady state, and the displacement and strain increment were positively correlated with the substrate inclination.