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为了有效控制近距离煤层开采时下层煤巷道变形严重的问题,结合南阳坡煤矿具体的生产技术条件,应用FLAC3D数值模拟软件,通过模拟区段留设煤柱的应力特征和3煤开采对下层煤2条巷道的侧向压力影响,得出侧向支承压力峰值16 MPa,距煤柱边缘8 m,应力集中系数为2.4。采用现场矿压观测的方法,研究了上下煤层同采时的侧向支承压力特征,得出下层煤侧向支承压力影响范围较大,在距工作面80 m之外,支护状态较好。实践表明,上层煤超前80 m开采时,更有利于综采工作面的协调开采和巷道的维护。
In order to effectively control the deformation of the lower seam roadway when the short distance coal mining is serious, combined with the specific production technology conditions of Nanyangpo coal mine, the FLAC3D numerical simulation software was used to simulate the stress distribution of coal pillar in the coal mine. The influence of the lateral pressure on the two roadways leads to a peak lateral support pressure of 16 MPa, an edge distance of 8 m from the coal pillar and a stress concentration factor of 2.4. By using the method of on-site rock pressure observation, the lateral bearing pressure characteristics of the upper and lower coal seam with the same mining time are studied. The influence range of the lateral supporting pressure of the lower coal seam is larger. The supporting condition is better than 80 m away from the working face. Practice shows that when the upper coal is advanced by 80 m, it is more conducive to the coordinated mining of fully mechanized coal mining face and roadway maintenance.