中文摘要：

结合元宝山露天矿工程实例。基于细观力学方法和强度折减理论，应用RFPA-SRM对比模拟了有无断层作用下，顺倾软岩边坡失稳的动态过程，分析了边坡的稳定性，研究了断层对边坡失稳的影响机理。由结果分析得出：考虑断层时,F8=1．099〉1，边坡稳定。不考虑断层时,F8=1．176，稳定系数增加O．077；边坡失稳破坏是一个渐进的过程。经历了裂隙的发生、扩展和贯通阶段，后形成滑动面。发生滑坡，同时存在拉张和剪切两种破坏方式；断层存在导致的应力状态改变和自身的强度特性是使滑坡模式和稳定性发生变化的根本原因。

英文摘要：

According to the actual data of Yanbaoshan open-pit and based on the mesoscopic mechanics method and the strength reduction method, the dynamic instability processes of the down dip soft rock with and without fault are simulated by the RFPA-SRM, then the stability of the slope, the affected form and the failure mechanism of the fault are studied. It is indicated that with fault, F8=1.099, without fault, F8=1.176, the slope is stable; the landslide or the failure of the slope is a gradual process of crack generation, extension, cut through stages and the tensile failure and the shear failure co-exist; the root cause is that the fault causes the change of the failure mode and the stability of the slope through the rock stress condition influenced by the fault and the strength characteristics.