冬瓜山铜矿采场大直径束状深孔爆破数值模拟

以冬瓜山铜矿常用的采场大直径束状深孔爆破技术为研究对象，对不同单孔炸药长度的爆破效果进行了系统的数值模拟分析。结果表明：炮孔爆破开始后，冲击波压力值逐渐升高，并且冲击波以柱面波形式向周围传播。炮孔起爆后，在不同的装药量情况下，粉碎区边界上爆炸冲击波的压力荷载都在很短的时间内达到一个极高的值，导致岩体发生强烈的压缩破坏。将模拟结果同完全相同工况下的大直径平行深孔爆破数值模拟结果的对比表明，应用大直径束状深孔爆破时的最大应力有了显著提高，且最大应力发生时刻也较平行深孔提前。因此，在相同装药量前提下，大直径束状炮孔爆破形式的炸药荷载作用效果更好。

Numerical Simulation on Large-diameter Bunch Deephole Blasting in Dongguashan Copper Mine

Take the Large-diameter Bunch Deephole Blasting in Dongguashan Copper Mine as an example,different explosive lengths in each hole were simulated.The results show that shock pressure increasing rapidly and the shock wave propagates outside in the form of cylindrical wave at the very beginning of blasting.The blasting load acting on rock in the smash district reach a high value in a short time after the initiation,which leads to the drastic failure of compression.The comparison with the results from parallel long-hole blasting simulation shows that bunch deephole blasting technique will make a much higher maximum stress whose happening time is earlier.So with the same charge weight,blasting effect of the large-diameter bunch deephole blasting will be better.