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为解决极近距离煤层开采下分层时,回采巷道受上分层采动以及本工作面超前应力影响,维护极其困难的难题,以新疆西沟煤矿IW301工作面为工程背景,深入分析上分层IW401工作面和本分层IW301工作面回采时,对IW301工作面运输巷及回风巷影响的力学机制,并据此提出采用断顶孔、卸压孔和高强支护结合的复合控顶技术。工业性试验结果表明,复合控顶技术对极近距离煤层外错布置方式下的回采巷道控制效果显著;经治理后,IW301回风巷顶底板最大变形215 mm,两帮最大变形135 mm,巷道整体状况良好。治理方案可供类似条件下的巷道围岩控制提供参考。
In order to solve the problem of extremely stratified mining under the conditions of stratification under the coal seam, mining roadway affected by stratified mining and the effect of advanced stress of the working face to maintain extremely difficult problems, taking the IW301 working face of Xigou Coal Mine in Xinjiang as the engineering background, Layer IW401 working face and the IW301 working face when mining, the IW301 working face transportation lane and return air lane influence mechanics, and accordingly proposed by the top hole, pressure relief hole and high-strength composite support composite control roof technology. Industrial test results show that the composite roof control technology is very effective in controlling the mining roadway with the extremely close distance coal seam outburst arrangement. After the treatment, the maximum deformation of the roof and floor of the IW301 return airway is 215 mm, the maximum deformation of the two sides is 135 mm, The overall situation is good. The control scheme can provide reference for surrounding rock control of roadway under similar conditions.