不同采煤方法对沿空留巷围岩稳定性影响研究

Research on Surrounding Rock Stability Influence of Gob Side Entry Retaining with Different Coal Mining Methods

以近水平煤层工作面为研究对象,利用FLAC^(3D)数值模拟技术,分别采用分层开采和综放开采2种开采方式,对沿空留巷围岩稳定性随上下区段工作面回采的变化进行了研究,以得到不同采煤方法对留巷位移及围岩应力的影响情况。研究结果显示:工作面推进相同的步距时,与分层开采相比,综采后两帮的垂直应力受影响偏大,顶板位移量增加,两帮位移量减小,底板位移量基本不改变;围岩受二次回采扰动影响,留巷形变量继续增加,应在工作面一次回采时对留巷围岩进行控制。

Taking horizontal coal seam working face as the research object,using FLAC3D numerical simulation technology,by slicing and caving mining method,research on the change of surrounding rock stability of gob side entry retaining with the upper and lower section of mining,and get the effect about displacement and stress of gob side entry retaining with different coal mining methods.The research results show that:when the working face advances the same step,compared with slicing,the vertical stress of the two gangs after full-mechanized mining is affected greatly,the displacement of the roof increases,the displacement of the two gangs decreases,and the displacement of the floor does not change substantially.The surrounding rock is affected by the secondary mining disturbance,and the remaining variable of the roadway continues to increase,and the surrounding rock of the retaining roadway should be controlled during the first mining of the working face.