煤层开采覆岩应力场及地表移动特征

Overburden stress field and surface movement characteristics in coal seam mining

以大平煤矿S2S9工作面为研究对象,与邻近工作面实测资料相结合,利用ADINA有限元软件模拟研究工作面开采过程中覆岩的应力场及地表移动特征.研究结果表明：岩层下沉为非对称下沉;开采完成时,地表形成了对称的下沉曲线和反对称的水平移动曲线,最大下沉值位于采空区的正中央,而在开切眼和停采线出现了水平移动峰值;距离煤层顶板越近,煤壁上方覆岩中竖向应力峰值越大,采场前支承压力区一般分布在工作面前方45~90 m内,峰值点距煤壁10 m左右.

This paper uses ADINA finite element software to study overburden stress field and surface movement characteristics in the mining process of S2S9 working face in Daping Mine, combined with the measured data of adjacent working face. The results show strata subsidence is asymmetric; when mining is completed, the ground surface form a symmetrical subsidence curve whose maximum subsidence is in the center of goaf area of coal mine, and an anisometric horizontal movement curve whose horizontal movement peak value appears in the open cut and stopping line; The closer distance from coal seam, the greater the peak value of overburden vertical stress above coal wall. The front abutment pressure on long wall face is 45-90m from the front of the working face, and the peak point is around 10m from coal wall.