魏家峁露天煤矿工作帮边坡滑坡机理研究

Study on landslide mechanism of working slope in Weijiamao Open-pit Coal Mine

为揭示魏家峁露天煤矿工作帮边坡滑坡成因确定滑坡范围,对滑坡区域进行了工程地质勘探,分析了滑坡区域的工程地质、水文地质特点,通过岩土物理力学实验确定了岩土体物理力学参数;运用GNSS位移监测和测斜仪分别对滑坡区域的表面位移和滑动层位进行了自动化监测,确定了滑坡范围和主滑体滑动方向;并利用FLAC3D对工作帮边坡的破坏模式和破坏机理进行了数值模拟。结果表明:工作帮边坡沿底板顺层滑动,坡体后缘圆弧剪切,破坏模式为坐落-平推破坏模式,坡体主要是开挖卸荷-剪切破坏机理。

In order to reveal the cause and scope of the landslide at the working slope of Weijiamao Open-pit Coal Mine,we carry out engineering geological exploration in the landslide area,analyze the engineering geological and hydrogeological characteristics of the landslide area,and determine the physical and mechanical parameters of the rock and soil mass by rock-soil physical and mechanical experiments.The article uses GNSS displacement monitoring and inclinometer to automatically monitor the surface displacement and sliding horizon of the landslide area,and determines the landslide scope and sliding direction of the main slide body,and uses FLAC3D to conduct numerical simulation of the failure mode and mechanism of the working slope.The results show that the working slope slides along the bottom layer,the slope body is shear in the back edge,and the failure mode is the seat-push failure mode,and the slope body is mainly the excavation-unloading-shear failure mechanism.