采区轨道运输大巷支护技术研究

摘要

In view of problems of simple indicator selection,big calculation error,complicated testing process existed in current bolt support design methods,stability classification of surrounding rock of roadway was determined by field investigation and laboratory mechanical test taking rail haulage roadway of No.3 north wing quasi mining area coal seam in a coal mine as research background,and different support schemes were put forward.Supporting effect of different support schemes were analyzed through numerical simulation analysis,and conclusions were obtained that supporting method of "anchor cable +anchor bolt + anchor net + steel strip" is the most reasonable supporting scheme of all,it has the minimum scope of plastic deformation of roadway surrounding rock,roof and floor of roadway and displacement of two side coal-walls are the minimum.The field test results also indicated that the surrounding rock deformation is small,the supporting control effect is better when use the supporting method of "anchor cable + anchor bolt + anchor net + steel strip".%针对现行锚杆支护设计方法存在指标选取简单、计算误差较大、测试过程复杂等局限性,以某煤矿3号煤北翼准采区轨道运输大巷为研究背景,通过现场调查、实验室力学试验确定巷道围岩稳定性等级,以此为依据提出了不同的支护方案.通过数值模拟分析不同支护方案的支护效果,得出如下结论:巷道采用“锚索+锚杆+网+钢带”的支护方式时,巷道围岩塑性变形范围最小,巷道顶底板及两帮位移量也最小,该方案是所有支护方案中最合理的.现场实测结果表明,采用“锚索+锚杆+网+钢带”支护方式时,巷道围岩变形较小,支护控制效果较好.