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中新上深涧煤业有限责任公司3#、11#煤层采用刀柱式回采且已基本采完,由于3#、9#、11#煤层层间距较小,给刀柱采空区上方9#煤层的综采造成了极大的困难。结合关键层理论,从刀柱采空区及上部煤层覆岩状况岩层结构的本质入手,进行了上行开采的可行性分析。采用数值计算软件FLAC3D3.0模拟并分析了近距离煤层群下9#煤层回采过程中所引起的围岩压力变化及围岩塑性区发展发育情况及11#煤层煤柱的稳定性,结果表明9#煤层可以安全进行回采,并提出了安全技术措施。
No.3 and No.11 coal seam of Zhongshang Shangjian Coal Industry Co., Ltd. adopts knife-column type recovery and has basically finished mining. Due to the small interval between 3 #, 9 # and 11 # coal seam, Full mechanized coal seam caused great difficulties. According to the theory of key layer, the feasibility of ascending mining was analyzed based on the nature of the strata structure in the goaf area and the overlying strata of the upper coal seam. Numerical simulation software FLAC3D3.0 was used to simulate and analyze the surrounding rock pressure changes and the plastic zone development and development of surrounding rock and the stability of 11 # coal seam pillars during the mining process of 9 # coal seam near the coal seam group. The results show that 9 # Coal seam can be safely recovered, and put forward safety technical measures.