论文部分内容阅读
木架山地表允许发生岩体移动和沉陷。由于非法开采,在井下形成了375 000 m2的采空区。为了避免冲击地压隐患,防止非法开采,必须崩塌上部采空区。提出用切顶与矿柱崩落法处理木架山采空区。应用ANSYS三维有限元程序,研究了极限跨度、悬臂状态下的极限跨度和切顶深度,分析了采空区处理对后续开采的影响。结论表明,覆岩较薄时,矿柱布置的变化必然引起采动应力的整体变化;应用102 m的极限跨度或76.5 m的悬臂极限跨度和8～11 m的切顶垂直深度,可确保白云岩顶板自然塌落;采空区处理不会影响后续安全生产。在sc,g 确定的情况下,H与计算部位的实际值差别越大,公式l =1.25H[sc/(g H)+0.001 2k]0.6的计算误差也越大。
Wood mounts allow the movement of rock mass and subsidence. 375,000 m2 of goafs were formed downhole due to illegal mining. In order to avoid the impact of pressure and hidden dangers, to prevent illegal mining, must collapse the upper gob. It is proposed that the mounding area of Mujiaoshan should be treated with top cut and ore pillar caving method. The finite element program of ANSYS was used to study the limit span, the limit span and the cut depth of cantilever, and the influence of goaf processing on subsequent mining was analyzed. The conclusion shows that the change of ore pillar arrangement will inevitably lead to the overall change of mining stress when the overburden rock is relatively thin. By using 102 m span or 76.5 m cantilever limit span and 8 ~ 11 m cutting top vertical depth, Rock roof natural collapse; goaf processing will not affect the follow-up safety. In the case of sc, g determined, the greater the difference between H and the actual value of the calculated part, the larger the calculation error of the formula l = 1.25H [sc / (g H) +0.001 2k] 0.6.