胜利东二露天矿南帮滑坡区压煤回采边坡稳定性研究

Research on slope stability of coal recovery on landslide area underlying southern slope in Shengli No.2 East Open-pit Mine

针对含有断层、软弱夹层的露天矿边帮压煤问题,从控制边坡稳定性的角度出发,结合胜利东二露天矿南帮边坡工程实际情况,运用极限平衡法、数值模拟等方法和手段,研究了不同煤柱留设长度边坡稳定性变化规律,确定了横采内排跟踪距离及横采工作帮坡角对南帮边坡稳定性的影响。研究结果表明、胜利东二露天矿南帮的滑坡模式为剪切圆弧-顺层滑移;当滑坡区F8断层上盘留有煤柱时边坡稳定性系数均小于1.0,且留设煤柱越长边坡稳定性越小;当清理F68断层上盘滑坡体小于100 m时南帮边坡稳定性有所提高,但变化较小;考虑到实际剥采工程发展过程中采运设备布置空间需要及安全问题,最终确定横采内排跟踪距离为10 m、横采工作帮留1个工作平盘。

In view of the problem of the coal recoveryon the open-pit mineslope with the fault and the weak intercalated layer from the viewpoint of controlling the slope stability,and combined with the engineering geological practice of southern soft rock slope in Shengli No.2 east open-pit coal mine,effects of different length of the coal pillar on slope stability were studied,the influence of the tracking distance of cross mining and the slope angle of cross mining on the stability of south slope are determined of limit equilibrium theory,numerical simulation and other means and methods.The results indicated that thefailure mode of slope in Shengli No.2 east open-pit coal mine is shear arc-bedding slip;The slope stability is less than 1.0 when the coal pillar is placed on the hanging wall of the Fault F8,and the longer the coal pillar is,the smaller the slope stability is;When cleaning the landslide mass on the hanging wall of the Fault F68 is less than 100 m,the south slope stability has been improved,but the change is small;Taking into account the problem of the needs and safety of the equipment layout space in actual development process of stripping and mining,and ultimately determining the tracing distance is 10 m and a working berm is setting in working slope of the cross exploitation and inner dumping.