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贵州某矿6#煤层和5#煤层为近距离煤层,下煤层回采巷道的支护问题一直是影响整个回采工作的重要因素,针对该矿下煤层回采巷道的支护问题,采用钻孔窥视仪对下煤层回采巷道的围岩结构进行了全断面探测,分析了巷道围岩破坏特征;在此基础上,结合FLAC3D数值模拟软件,研究了上煤层残留煤柱底板应力分布特征,分析了上煤层遗留煤柱集中应力对下煤层回采巷道围岩稳定性的影响,并根据下煤层回采巷道围岩受力和变形特征,提出了非对称支护设计方案,现场监测数据表明该非对称支护方案能够较好的控制巷道围岩变形。
The 6 # and 5 # coal seam of a mine in Guizhou is a close distance coal seam. The support of mining roadway in the lower coal seam has always been an important factor that affects the whole mining work. According to the support problem of the mining roadway under the coal seam, On the basis of the above, combined with the FLAC3D numerical simulation software, the stress distribution characteristics of the residual coal pillar in the upper coal seam are studied, and the characteristics of the upper coal seam The influence of concentrated coal pillar residual stresses on the surrounding rock stability of mining gateway in the lower coal seam is proposed and the unsymmetrical support design scheme is put forward according to the stress and deformation characteristics of the surrounding rock in the coal mining gateway under lower coal seam.The monitoring data show that the asymmetric support scheme Can better control the deformation of roadway surrounding rock.