露天矿含断层与顺倾弱层群边坡形态分段优化研究

针对横采内排追踪压帮条件下露天矿含断层与顺倾弱层群边坡稳定性分析与形态设计难题，顾及露天矿层状边坡垂直方向上的地层岩性、工程发展过程中的服务时间、要求的稳定程度等方面的差别以及深部边坡稳定性的三维效应，以胜利东二号露天煤矿首采区南帮为工程背景，采用二维极限平衡法与三维数值模拟相结合，对露天矿含断层与顺倾弱层群边坡形态进行了分区段优化。研究表明，胜利东二号露天煤矿边坡稳定性主要受坡体内一系列顺倾弱层控制，断层可能作为滑体的边界，其潜在滑坡模式为以圆弧或断层为侧界面、以弱层为底界面的切层-顺层滑动或切层-顺层-鼓胀破坏|随着追踪距离的增大，边坡的破坏模式由浅部大范围破坏逐步过渡为深部破坏，是深部边坡稳定性下降的根本原因|分段优化后的边坡应划分为三个阶段，整体边坡角14°，横采工作帮与内排土场间的追踪距离应为50m。

Subsection optimization of soft rock slope with faults and dipping weak strata group in open-pit mine

In view of the difficulties in stability analysis and shape design of open-pit mine slope with faults and dipping weak strata under the condition of horizontal mining and inner row tracing and pressing,the two-dimensional limit equilibrium method is used combining with three-dimensional numerical simulation to optimize the slope shape of open-pit mine with faults and dipping weak strata taking the south side of the first mining area of Shengli East No.2 Open-pit Coal Mine as the engineering background,considering the difference of stratum lithology in the vertical direction of open-pit mine layered slope,service time in the process of engineering development,required stability degree and the three-dimensional effect of deep slope stability.The research shows that the slope stability of Shengli East No.2 Open-pit Coal Mine is mainly controlled by a series of dip weak strata in the slope,and the fault may serve as the boundary of the sliding body.The potential landslide mode is slicing-bedding sliding or slicing-bedding-bulging failure with circular arc or fault as the side interface and weak layer as the bottom interface.With the increase of tracking distance,the failure mode of slope gradually transits from shallow large-scale failure to deep failure,which is the fundamental reason for the decline of deep slope stability after subsection optimization,the slope should be divided into three stages,the overall slope angle is 14°,and the tracking distance between the horizontal mining work side and the inner dump should be 50 m.