弓长岭露天矿含断层边坡稳定性研究

摘要

There are many faults in the north of Dumu mining area of Gongchangling Open-pit mine. In order to deter-mine the influence range of fault and the influence of slope stability and slip mode,6 kinds of working conditions are divided to research according to the difference of fault location:In initial position,fault is moved to the inside of the slope of 30 m,60 m, 90 m,120 m and there is no fault. FLAC and Geo-Slope software are used to simulate the 6 kinds of working conditions. By comparing the maximum shear strain,horizontal displacement,vertical slice and slope safety factor,the influence of fault loca-tion on the stability of the slope are analyzed. Results show:When the fault is less than 100 m to the slope,the slip mode of the slope is the plane-shear arc sliding mode with the fault as the lateral boundary,and the slope stability is poor;When the fault is more than 130 m to the slope,the slip mode of the slope is no longer affected by faults,the potential slip surface is single shear arc,and the slope stability is better. The research results has a great reference value to the mining plan and the slope design of the mine.%弓长岭露天矿独木采区北帮存在大量断层,为确定断层的影响范围及其对边坡稳定性和滑移模式的影响,根据断层位置的不同分为6种工况进行研究：断层在初始位置,断层向边坡内侧水平移动30、60、90、120 m,没有断层。利用FLAC和Geo-Slope软件对6种工况进行模拟计算,通过对比各工况模型的最大剪应变云图、水平位移云图、垂直条分图和边坡安全系数来分析断层位置对边坡稳定性的影响。结果表明：断层距坡面小于100 m时,边坡的滑移模式为以断层为侧边界的平面-剪切圆弧滑动模式,边坡稳定性较差；当断层距坡面大于130 m时,边坡的滑移模式不再受断层的影响,潜在滑移面是单一的剪切圆弧,边坡稳定性较好。研究结果对矿山制定开采方案、进行边坡设计很有借鉴意义。