基于Bishop极限平衡法的后安煤矿采煤沉陷区边坡角确定与稳定性评价

Determination of Slope Angle and Stability Evaluation of Coal Mining Subsidence Area in Hou’an Coal Mine Based on Bishop’s Limit Equilibrium Method

摘要: 本文以山西朔州平鲁区后安煤矿采煤沉陷区为研究对象，结合现场地质勘察与室内岩土力学试验数据，采用Bishop极限平衡法对沉陷区南、北、东、西四个方向的边坡剖面进行稳定性分析。通过圆弧滑动模型计算各剖面在不同坡角下的安全系数，确定了最终稳定边坡角分别为南帮33˚、北帮30˚、东帮33˚、西帮33˚，并给出了相应的安全储备系数选取依据。研究结果表明，所确定的边坡角可为沉陷区治理中黄土覆盖量估算及边坡加固设计提供科学依据。本研究建立的边坡稳定性评价方法对类似地质条件矿区的沉陷区治理具有参考价值。

Abstract: In this study,the coal mining subsidence area of Hou’an Coal Mine in Pinglu District, Shuozhou City, Shanxi Province was taken as the research object. Combined with the data from field geological surveys and laboratory geotechnical mechanics tests, the Bishop limit equilibrium method was adopted to conduct stability analysis on the slope profiles in the south, north, east and west directions of the subsidence area. The safety factors of each profile under different slope angles were calculated by means of the circular slip surface model, and the final stable slope angles were determined as 33° for the south slope,30° for the north slope,33° for the east slope and 33° for the west slope,with the corresponding basis for the selection of safety reserve coefficients provided. The research results show that the determined slope angles can provide a scientific basis for the estimation of loess coverage and the design of slope reinforcement in the treatment of the subsidence area. The slope stability evaluation method established in this study has reference value for the treatment of subsidence areas in mining areas with similar geological conditions.