高水平应力下孤岛破裂矿柱开采技术研究与应用

铜坑矿92^#矿体采用空场嗣后废石充填法、组合崩落法进行开采,由于采空区治理不及时、不彻底,预留的盘区柱在高水平应力作用下片帮、冒顶,成为难采孤岛破裂矿柱。以201^#线孤岛破裂盘区柱为试验采场,通过开展岩石完整性测试,评价采场底部结构的稳定性,采用数值模拟方法对盘区柱破裂演化规律进行分析,评价破裂矿柱诱导崩落的可行性,并运用"部分空场-诱导崩落法"联合回采,实现破裂矿柱诱导崩落,试验采场贫化率由29.4%降低至17.5%,损失率由43.8%降低至26.3%,取得良好的安全生产效果,可为其它类似开采条件的破裂矿柱回采提供技术参考。

Research and Application of Isolated Fractured Pillars Mining Technology Under High Horizontal Stress

Open stoping with subsequent rock filling method and composite caving mining method were used for the mining of No.92^#ore body of Tongkeng Mine.For lack of timely and thorough treatment of goaf,rib spalling and roof fall often occurred in the reserved panel columns for high horizontal stress,and many isolated fractured pillars were formed.In this paper,the 201^# line island rupture zone column was used as the test stope.The rock integrity test was conducted to evaluate the stability of the bottom structure of the stope.The numerical simulation method was utilized to analyze the rupture evolution law of the block column and evaluate the fracture column induction,and the feasibility of caving.and the"partial empty field-induced caving method"combined mining was applied to achieve the collapse of the collapsed pillar.The dilution rate of test stope was decreased from 29.4%to17.5%,and the loss rate was reduced from 43.8%to 26.3%,achieving good safety production effect.The work can provide technical reference for other fractured pillar mining under similar mining conditions.