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我国急倾斜特厚煤层的储量较为丰富,且多采用水平分层开采方法,该方法具有开采成本低、安全性好、效率高等特点,但采场周围的应力集中程度高导致矿压显现强烈。为此,通过FLAC~(3D)建立了急倾斜特厚煤层开采数值模型,模拟了开采过程中的应力分布,分析了应力分布的规律和上分层开采对下分层卸压的影响范围。结果表明:随着工作面的推进,支承压力增加的幅度就趋于平缓,形成明显的应力区;同时采空区上部煤岩体的卸压范围随开采分层数增加而有增加趋势。
The reserves of steeply-inclined and extremely thick coal seam in our country are abundant, and the horizontal stratified mining method is mostly used. The method has the characteristics of low exploitation cost, good safety and high efficiency. However, the high stress concentration around the stope leads to the strong occurrence of the rock pressure. Therefore, the numerical model for the mining of steeply-inclined and extremely thick coal seam was set up by FLAC 3D and the stress distribution in the process of mining was simulated. The law of stress distribution and the influence scope of the upper stratified mining on the delamination delamination were analyzed. The results show that with the advancement of working face, the increase of supporting pressure tends to be gentle, and a clear stress zone is formed. Meanwhile, the pressure relief range of upper coal and rock mass in goaf increases with the increase of mining stratification number.