为了对露天矿顺倾软岩边坡稳定性进行科学的评价,以大唐胜利东二号露天矿为工程背景,基于岩体结构控制论、极限平衡理论,研究边坡煤岩体内赋存的顺倾弱层和大断层对软岩边坡的稳定性影响。通过对监测数据的整理分析,并应用自行研发的极限平衡软件定量分析了采场南帮边坡的滑坡模式、滑坡机制。结果表明,现状边坡由西向东稳定性下降,并且存在顺倾弱层,揭露的弱层若受到断层切割作用时,易发生平面楔形滑动；若未受到断层的切割作用时,易发生以弱层为底界面的切层-顺层滑动。采场南帮边坡潜在滑坡模式是以6煤层底板附近的顺倾弱层为底部界面的平面楔形滑动；F68断层是滑移体的侧边界,断层下盘相对稳定。

In order to scientifically evaluate the slope stability of open-pit mine down dip soft rock, the stability of the soft rock slope on the down dip weak layers and the large faults in slope coal and rock is studied. Based on the rock mass structure control theory and the limit equilibrium theory, a case study of Datang Shengli East II open-pit mine is carried out. Firstly, the monitoring data are classified. Secondly, the limit equilibrium software developed by our research group is used to quantitatively analyze the landslip mode and the mechanism of the south working pit edge. The result indicates that the stability of the current slope is declined from west to east, and the down dip weak layers can be observed. If the exposed weak layer cuts the fault, a slip of plane wedge-shape would happen, or else, there will be a slip from the sliced layer to the down dip layer with the weak layer as the bottom boundary. The potential landslip mode in the south working pit edge is the slipping of plane wedge-shape, and its bottom boundary is the down dip weak layer near the 6th coal seam floor. The F68 fault is the side boundary of the slipping solid, and the lower parts of the fault are relatively stable.