针对露天矿横采作业中端帮边坡潜在滑体空间受限，传统边坡稳定性计算方法不再适用的问题，采用数值模拟方法研究采场深部边坡潜在的滑坡机理，拟合潜在滑体中坡面和滑面的空间形态方程，基于三维极限平衡条形划分方法，将滑体底面沿横纵方向划分单元微条柱，分析微条柱在滑体与坡顶线空间位置不同区域的受力情况，运用等效思想，将每行微条柱的力学效应叠加，等效到滑体主滑线上的微条柱，对应获得主滑线条柱底界面上的等效抗剪强度参数，从而建立限制滑体边界的三维稳定性等效算法，并进行工程应用，设计回采煤炭资源。结果表明：含弱层边坡的潜在滑坡模式为切层−顺层组合滑动，潜在滑面的空间形态为近似椭球面与倾斜平面的组合；边坡三维稳定性系数随着潜在滑体走向受限长度的增大而逐渐减小，呈现近似二次抛物线关系；在潜在滑体受限空间条件下，计算多种滑坡模式的边坡稳定性，不同边坡角对应的三维稳定性系数均大于二维稳定性系数；实际设计回采深部煤台阶时，随着+843平盘宽度不断减小，边坡稳定性随之减小，当局部边坡角为25.58°时，刚好满足安全储备系数1.2要求。相较于常规边坡稳定性分析方法，本研究方法更能反映受三维夹持支挡效应下的边坡三维稳定性，可为该类边坡安全评估方法提供新思路。

Aiming at the problem that the potential sliding body space of the middle end slope of the open pit mining operation is limited, and the traditional slope stability calculation method is no longer applicable, the potential landslide mechanism of the deep slope of the stope is studied by numerical simulation method, and the spatial morphological equation of the slope surface and the sliding surface in the potential sliding body is fitted. Based on the three-dimensional limit equilibrium strip division method, the bottom surface of the sliding body is divided into unit micro-strips along the transverse and longitudinal directions. The force situation of the micro-strips in different areas of the spatial position of the sliding body and the top line of the slope is analyzed. Using the equivalent idea, the mechanical effect of each row of micro-strips is superimposed, which is equivalent to the micro-strips on the main sliding line of the sliding body. The equivalent shear strength parameters on the bottom interface of the main sliding line column are obtained, so as to establish a three-dimensional stability equivalent algorithm for restricting Carry out engineering application and design to recover coal resources. The results show that the potential landslide mode of the slope with weak layer is the combination of shear layer and bedding slide. The spatial morphology of the potential sliding surface is the combination of approximately ellipsoid and inclined plane. The three-dimensional stability coefficient of slope decreases gradually with the increase of the potential sliding body's strike limited length, showing an approximate quadratic parabola relationship. In the limited space of potential sliding body, the slope stability of various landslide modes is calculated, and the three-dimensional stability coefficients corresponding to different slope angles are greater than the two-dimensional stability coefficients. In the actual design of deep coal mining step, the slope stability decreases with the continuous reduction of +843 plate width. When the local slope angle is 25.58°, it just meets the requirement of safety reserve factor 1.2. Compared with the conventional method of slope stability analysis, this method can better reflect the three-dimensional stability of slope under the effect of three-dimensional clamping support, and can provide a new idea for the safety evaluation method of this kind of slope.