针对软弱基底排土场普遍存在稳定性差的问题,在分析了排土场失稳的主要影响因素以及常见的5种失稳模式的基础上,结合胜利东二露天煤矿南排土场南帮边坡工程地质实际,基于强度折减理论,运用大型岩土数值模拟软件FLAC3D对排土场逐水平堆载过程中基底与边坡岩体变形破坏规律及稳定性进行了数值模拟分析,确定了南排土场南帮边坡的破坏模式以及最终排弃高度。结果表明:胜利东二露天矿南排土场边坡变形破坏主要受排弃物料重力影响,随着排弃高度的增加,基底内部第四系弱层最大位移呈线性增加,弱层以下岩土体变形量较小,其滑坡模式为沿基底内部弱层发生的剪切圆弧滑动,可在原设计基础之上继续排弃一个排土台阶高度,提高了排土场的空间利用率,并为类似排土场边坡设计提供借鉴。 Based on the analysis of the main factors that affect the stability of the dumping site and the common five instability modes, aiming at the problem of poor stability of the soft soil dump, Based on the theory of strength reduction and large-scale geotechnical numerical simulation software FLAC3D, the deformation and failure regularity and stability of basement and slope rock mass in the process of horizontal dumping are analyzed numerically. Dumping site South slope damage patterns and final abandonment height. The results show that the deformation and failure of the slope in the southern dump site of Shengli East Second Open Pit are mainly affected by the gravity of the discharged material. With the increase of the discharge height, the maximum displacement of the Quaternary weak layer in the basement increases linearly. The volume of deformation is small, and the landslide mode is the sliding along a circular arc that occurs along the weak layer in the basement. Based on the original design, it can continue to abandon a dumping step height and increase the space utilization efficiency of the dumping site. Similar dumping slope design to provide reference.