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以山西省阳泉市坡头滑坡为例,在详细查明矿区工程地质条件、滑坡变形破坏特征、采空区与滑坡发育的空间位置关系以及采空沉陷规律的基础上,应用FLAC3D数值模拟软件分析了采动影响区外缘第四系黄土覆盖层的应力应变关系、位移变形特征。获得了该滑坡形成的力学机理:黄土滑坡受采空区上覆岩层移动变形控制;采动引起上覆岩层的蠕动对表层黄土的挤压变形具有放大作用;黄土滑坡的变形破坏具有聚能效应。
Taking Portou landslide in Yangquan City of Shanxi Province as an example, based on the detailed geological engineering conditions, the deformation and failure characteristics of landslides, the spatial relationship between the goaf and the landslide and the law of the mining and subsidence, the FLAC3D numerical simulation software The stress-strain relationship and displacement deformation characteristics of Quaternary loess overburden on the outer margin of mining affected area. The mechanical mechanism of landslide formation is obtained: the loess landslide is controlled by the deformation of the overlying strata in the goaf; the creep of overlying strata caused by mining can amplify the compressive deformation of surface loess; and the deformation and failure of loess landslides have the energy-accumulating effect .