复采巷道过空巷交叉段围岩控制技术

Surrounding rock control technology of crossing abandoned roadway intersection of compound mining area

以宇昌煤业复采区地质条件下回采巷道的围岩控制为工程背景,针对与空巷相交区围岩破碎支护困难的问题,对回采巷道破碎段的围岩控制技术方案及参数进行研究。采用理论计算得出回采巷道煤柱稳定的理论宽度,并通过数值计算得出交叉巷道三角区煤柱弹性核区宽度小于2 m时,需要采用架棚的支护方式维护巷道稳定;通过对掘采期间巷道围岩应力及变形的理论计算及数值模拟分析,确定了合理的架棚支护区域及支护方案;现场实测表明,采用锚网索和工字钢棚联合支护的方式,巷道变形量得到了有效控制。

Taking the surrounding rock control of the abandoned roadway under the geological conditions of the compound area of Yuchang Coal Mine as the engineering background,aiming at the problem of difficulty in breaking and supporting the surrounding rock in the area where the abandoned roadway intersects,the surrounding rock control technology scheme and parameters of the crushing section of the mining roadway were studied.The theoretical width of the coal pillar stability of the mining roadway is obtained by theoretical calculation,it is necessary to use the support method of shed to maintain the roadway stability when the width of the elastic core area of the coal pillar in the triangular area of the cross roadway is less than 2 m by numerical calculation.Through the theoretical calculation and numerical simulation analysis of the stress and deformation of the surrounding rock of the roadway during excavation and mining,a reasonable scaffolding support area and support scheme were determined.Field measurement shows that the joint support method of anchor mesh cable and I-beam shed can effectively control the deformation of the roadway.