安庆铜矿富水炮孔导爆索起爆冲击波分析

Analysis of Detonation Shock Wave of Rich Water Hole Detonating Cord in Anqing Copper Mine

安庆铜矿的VCR采矿法大直径深孔采用导爆索起爆。爆破过程中,通常会遇到一些地下水丰富的炮孔即使在装药前用高压风去处理孔内的积水,然而吹完后很快又出现积水,因此需要采用水孔爆破技术。借助ANSYS有限元数值软件模拟导爆索在空气中和水中起爆,由计算结果可知:导爆索爆炸后在水中产生冲击波的超压值要比在空气中爆炸后产生的冲击波超压值显著加大,起爆后在炮孔内经过反复反射与叠加,使冲击波的超压最大值及作用时间都提高,使爆破效果更好。

Large-diameter deep hole in the VCR method of Anqing Copper Mine adopts the detonating cord blasting.In blasting process,some rich water holes are often met with.Even if the water in hole is handled by high-pressure wind before charging,water will be appeared soon.Therefore,the water hole blasting technology is needed.With the help of ANSYS finite element numerical simulation software,the detonating cord is blasted in air and water through numerical simulation.The calculation results indicate： the shock wave overpressure values produced in the water after explosion of detonating cord is greater than that in the air.After repeated reflection and overlay in the hole after firing,the maximum overpressure of the shock wave and the action time are all increased,resulting in a better blasting effect.