中厚-厚煤层近距离高效同采矿压控制研究

南阳坡煤矿主采煤层为3号煤和4号煤,层间距23~26m,下部煤层开采受上部煤层开采损伤影响,为中厚-厚煤层近距离同采。基于煤岩物理力学测试、在线应力监测、支护载荷无损监测及数值计算,得出了监测区域的侧向应力分布规律,3煤开采对下煤层传递角为45°,显著支承压力增高区域传递角为31°;监测评价沿空30205运输顺槽、4105运输顺槽支护效果,分析下煤层沿空巷道变形严重的四个原因;确定了未采下区段4107回风顺槽设计留设的区段煤柱尺寸以及正常条件下下煤层滞后上煤层合理距离。研究结果有助于合理设计采场及选取支护参数,有利于实现中厚-厚煤层近距离高效同采。

Study on ground pressure control of effective simultaneous production in close distance coal seams

No.3 and No.4 coal seams in Nanyangpo mine are main mining coal seams with distances from 23m to 26m, and No.4 coal seam (lower) mining influenced by No.3 coal seam(upper) mining failure, and this is simultaneous mining of medium-thickness(No.3) and high-thickness(No.4) coal seam in short distance. Based on physical and mechanical tests, on-line stress monitoring, support load non-destructive testing and numerical computation, it was showed that distribution law of lateral stress in monitoring area, carrying angle of lower coal seam is 45°and carrying angle in significant abutment pressure increase region is 31°for No.3 coal seam mining. The supporting effects of along gob area of 30205 transportation drift and 4105 transportation drift were monitored and evaluated. Four reasons of serious deformation of along gob roadway in lower coal seam were analyzed. The size of section coal pillar at return air-way of next non-mining section face 4107 and the reasonable distance of lower coal seam lagging behind upper coal seam under normal conditions were determined. The research results will contribute to reasonable mining design and choice of supporting parameters, and realize effective simultaneous mining of medium-thickness and high-thickness coal seam in short distance.