采动影响区外缘上覆黄土滑坡形成力学机制

Mechanical Mechanism of Overlying Loess Landslide Formation at Outer Edge of Mining- affected Zone

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 Poutou landslide in Yangquan City of Shanxi Province as an example,on the basis of detailed identification of mining engineering geological conditions,deformation and failure characteristics,spatial relationship between gob and landslides and mining subsidence features,we analyzed the stress- strain relationship and displacement deformation characteristics of quaternary loess outside of mining influence region by the FLAC3 Dnumerical simulation software. We get the mechanical mechanism of the landslide as follows that loess landslides are controlled by movement and deformation of overlying strata in gob area. The creeping of overlying strata has magnifying effects on the extrusion deformation of the surface loess. Loess landslide has energy aggregation.