三山岛金矿深部采场动力灾害监测与分析

三山岛金矿属于典型海底开采金属矿山,现已进入深部开采,采场地压显现活动增多,深部区域矿体开采过程中诱发动力灾害的监测技术亟待提升解决。选取三山岛金矿典型采场作为试验采场,构建爆破模型;同时确定监测区域,采用局域式微震监测技术进行监测,对采场开采过程围岩受应力变化及爆破扰动造成岩体微破裂事件进行监测分析,结果表明现有扇形中深孔爆破参数较合理,并可适当降低炸药单耗;此外,监测区域内岩体稳定性较好,开采诱发应力急剧增加并释放的可能性较低,但爆破落矿区域存在的安全风险较高。研究结果能够对开采过程的采场围岩稳定性进行有效评价和精确预测分析。

Monitoring and analysis of dynamic disaster in Sanshandao Gold Mine deep stope

Sanshandao Gold Mine is a typical seabed-mining metal mine, as the deep orebody is being mined, stope ground pressure increases significantly, the monitoring technology of dynamic disaster induced by mining activities has to be improved urgently. Typical test stope was selected and blasting model was created. Furthermore, monitoring area was determined, and local microseismic monitoring technology was adopted to monitor and analyze micro-crack events of rock mass caused by surrounding rock stress variation and blasting disturbance in the process of mining, the results showed that the current blasting parameters of fan shaped medium deep holes was reasonable, and the unit explosive consumption could be appropriately reduced. In addition, the rock mass in the monitoring area was stable with a low possibility of rapid increase and release of mining induced stress, however, the safety risk in the blasting area was high. The research results can be used to effectively evaluate and accurately predict rock mass stability.