特大采空区下矿柱回采的安全性评价

Safety Assessment on Pillar Recovery in Extremely Large Mine-out Areas

在狮子山铜矿西山矿段,多年的开采形成了一个特大采空区,采空区中留有一个大的连续矿柱。为合理地部分回收矿柱中的矿石,采用极限平衡方法分析了点柱、水平矿柱的承载能力、分析计算了采空区顶板的稳定性,并给出了安全系数。分析计算的结果表明,合理回采部分矿柱是安全可行的。

In the Xishan section of Shizishan Copper Mine, a very big continuous pillar remains unrecovered in the extremely large mined-out area left after many years of mining. In order to partially recover the pillar in a rational way, the bearing capacity of the point pillar and horizontal pillar is analyzed using the limit balance method. Stability of the roof of the mined-out area is analyzed and the safety coefficient is obtained. Calculation results indicate that it is safe and feasible to recover part of the ore pillar in a rational way.