关键词: 基岩裸露, 山区采动, 开采沉陷, 数值模拟

Abstract: In order to analyze the surface ground movement law of mining under exposed bedrock mountain，Firstly, the software Auto CAD and Sufer was applied to establish mountainous terrain model,then the FLAC3D numerical simulation software was applied to individually establish and calculate numerical model of Mining under exposed bedrock mountain, according to the specific geological，topography and mining conditions of Shigao coal mine of Chongqing Songzao. The characteristics were obtained according to the results of simulation analysis, firstly,the values of surface subsidence and horizontal movement was strongly influenced by the surface sliding on the edge of the gob area and surface subsidence was smooth at the top of the mountain and valley area. Secondly,the horizontal movement of mining surface was larger than that of the plains under concave mountainous topography and the horizontal movement of mining surface was 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 of under plain mining.At the top of the mountain area, the mining surface is strongly influenced by stretch,and the stretch value of horizontal deformation is larger than that of under plain mining.