基岩裸露山区采动地表移动规律研究

Study on surface ground movement law of mining under exposed bedrock mountain

首先运用Auto CAD与Sufer软件建立山区地表模型,然后根据重庆松藻矿区石壕煤矿工作面的地质、地貌和采矿条件为原型,采用FLAC3D数值模拟软件建立和计算了裸露基岩山区水平煤层开采数值模型。根据模拟结果分析得到:1在采空区边缘区域,地表下沉值与水平移动受山区地表滑移的影响较大,在山顶和山谷区域,地表下沉变化较为平滑;2在山区凹形地貌下采动地表水平移动较平原地区要大,在山区凸形地貌下采动地表水平移动较平原地区要小;3在山谷区域,采动后地表受压缩的影响较大,水平变形压缩值较平原采动后要大;在山顶区域,采动后地表受拉伸的影响较大,水平变形拉伸值较平原采动后要大。

Auto CAD and Sufer are applied to establish mountainous terrain model,the numerical model of Mining under exposed bedrock mountain is established and calculated using FLAC3 D,according to the specific geological,topography and mining conditions of Shigao coal mine of Chongqing Songzao. The characteristics are obtained according to the simulation results,firstly,the surface subsidence and horizontal movement is strongly influenced by the surface sliding on the edge of the gob area and surface subsidence is smooth at the top of the mountain and valley area. Secondly, the horizontal movement of mining surface is larger than that of the plains under concave mountainous topography and the horizontal movement of mining surface is smaller than that of the plains under convex mountainous topography. Finally,in the valley area, the mining surface is strongly influenced by compression, and the compression value of horizontal deformation is larger than that under plain mining; while in mountain top area,the mining surface is strongly influenced by stretch,and the stretch value of horizontal deformation is larger than that under plain mining.