采空区下极近距离煤层回采巷道合理位置的研究
Study on the Reasonable Location of Mining Gateway in the Very Close Quarter Coal Seam Under Goaf
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摘要: 采用数值模拟和场论分析的方法研究了嘉乐泉8#煤采空区下极近距离9#煤层回采巷道合理位置的选择问题，结果表明：8#煤残留煤柱支承压力使底板岩层中应力非均匀分布，其垂直应力σz的非均匀分布是巷道围岩的稳定性的主要影响因素；回采巷道应布置在采空区下垂直应力σz的应力降低区，以及巷道受力均衡区；嘉乐泉9#煤回采巷道布置在距8#煤残留煤柱边缘水平距离15 m的采空区下，经嘉乐泉煤矿9101工作面的回采实践证明了巷道布置的合理性。Abstract: The reasonable location of mining gateway, in the very close quarter No.9 coal seams under goaf of No.8 coal seam in Jialequan Coal Mine, was studied by numerical simulation and field theory analysis. The results showed that abutment pressure formed from residual coal pillars of No.8 coal seam makes the stress distribution of floor non-uniform, and the non-uniform distribution of vertical stress σz is a main factor that influence the stability of the surrounding rock; the choice of reasonable location of mining gateway should not only consider stress considering zone of vertical stress σz under goaf, but also pay attention to the force equilibrium of the tunnel; the mining gateway in the No.9 coal seam of Jialequan Coal Mine is arranged under goaf whose horizontal distance is about 15 meters from the edge of residual coal pillars in No.8 coal seam, and the actual mining practice of No.9101 working face has proved the rationality of the gateway layout.
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