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为了对露天煤矿软弱夹层赋存下顺倾边坡稳定性进行科学评价,以某露天矿内排土场边坡为工程背景,基于极限平衡法,以监测数据分析、滑坡反分析、现场钻探等手段为依据,研究软弱夹层赋存下对内排土场边坡稳定性的影响。结果表明,该内排土场边坡滑坡趋势已基本形成,尚处于匀速变形阶段,煤层底板下部赋存厚约2~3 m的软弱泥岩层组为本次变形的主导因素。为防止露天矿发生大面积滑坡现象,经过治理方案比选,采用“上覆削坡减载”的防治措施进行治理。露天矿采用并实施该治理方案后,边坡变形得到了控制,露天矿的安全生产得到了保证。
In order to carry out scientific evaluation on the stability of downright slopes under the presence of weak intercalations in opencast coal mines, based on the limit equilibrium method, the slope of a dump site in an opencast mine is taken as the engineering background, with monitoring data analysis, landslide reverse analysis, on-site drilling, etc. Based on the means to study the influence of the weak dump on the slope stability of the internal dump. The results show that the landslide tendency in the dump site has been basically formed and is still in the stage of uniform deformation. The weak mudstone with a thickness of 2 ~ 3 m in the lower part of the coal seam floor is the dominant factor in this deformation. In order to prevent the occurrence of large-scale landslide in open-pit mines, through the comparison and selection of governance programs, the prevention and control measures of “overloading and undercutting of overburden” are adopted. After the open pit mine adopted and implemented this treatment plan, slope deformation was controlled and the safety of open pit mine was guaranteed.