露天采场多台阶滑坡机理与治理方案研究

Study on Mechanism and Control Scheme of Multi-Step Landslide in Open Pit

为了研究露天采场边坡多台阶滑坡产生的机理,以某露天采场滑坡为研究背景,分析了滑坡产生原因、边坡破坏类型及产生机理,并通过数值模拟方法开展滑坡体稳定性分析。依据机理研究结果与相关规范,制定了滑坡治理方案。研究结果表明:采场滑坡主要由坡体岩石破碎、坡面角较陡、节理构造发育、坡体顶部排水不畅等多种原因造成;边坡破坏类型为垮塌-推移式滑坡破坏,是由于上部第一个台阶垮塌导致下部第二个台阶到第四个台阶滑移产生滑坡;数值模拟结果显示,滑坡体的安全系数小于许用安全系数,滑坡体处于不稳定状态;采用削坡减载治理方案,可以消除滑坡体的安全隐患。研究结果为矿山边坡滑坡治理设计与施工提供了依据,并取得良好效果。

In order to study the mechanism of multi-step landslide in open-pit slope,taking an open-pit landslide as the research background,the causes,slope failure types and producing mechanism of landslide were analyzed,and the stability of landslide was analyzed by numerical simulation method.According to the results of mechanism research and related specifications,the landslide control scheme was formulated.The research results show that the stope landslide is mainly caused by rock fragmentation,steep slope angle,joint structure development and poor drainage at the top of the slope.The slope failure type is collapse-push landslide failure,which is caused by the sliding of the second step to the fourth step due to the collapse of the first upper step.The numerical simulation results show that the safety factor of the landslide is less than the allowable safety factor,and the landslide is in an unstable state.The potential safety hazard of landslide can be eliminated by using the control scheme of slope cutting and load reduction.The research results can provide a basis for the design and construction of mine slope landslide control,and have achieved good results.