近距离煤层回采巷道支护方法研究

Research on Support Method of Mining Roadway in Close Distance Coal Seam

针对近距离煤层回采巷道稳定性问题,以柳林某煤矿为工程背景,采用理论分析、数值模拟与现场监测相结合的方法,构建了煤层底板破坏深度分析力学模型,对回采巷道支护方法进行了研究。研究结果表明,底板岩层最大破坏深度为12.85 m,近似两煤层平均间距,下煤层回采巷道可能会遭受采动影响。提出锚杆+注浆锚索联合支护方法,巷道顶、底板最大垂直位移分别为47 mm与36 mm,两帮最大位移约为44 mm,保障了巷道的稳定性。

Aiming at the stability of the coal seam roadway under short-distance coal seam mining,taking a coal mine in Liulin as the engineering background,using a combination of theoretical analysis,numerical simulation and on-site monitoring,a mechanical model for the depth analysis of coal seam floor failure was constructed.The mining roadway support method is studied.The research results show that the maximum affected depth of the floor rock layer is 12.85 m,which is similar to the average distance of the two coal seams.The mining roadway of the lower coal seam will inevitably be affected by mining.The combined support method of bolt+grouting anchor cable proposed in the study,the maximum vertical displacement of the roof and floor of the roadway is 47 mm and 36 mm respectively,and the maximum displacement of the two sides is about 44 mm,which ensures the stability of the roadway.