基于数码电子雷管的露天矿山爆破延期时间研究及应用

Research and Application of Open-pit Mine Blasting Delay Time Based on Digital Electronic Detonator

为解决露天矿山中深孔爆破大块率高、爆破振动大等问题,利用数码电子雷管延期精度高、延期时间自由设置等特点,开展应用研究。通过炸药爆炸理论分析,计算出爆破网路中孔间、排间理论延期时间;通过数值模拟对爆孔周围应力及振动速度进行分析验证,并结合大量现场爆破试验数据,总结出数码电子雷管爆破延期时间对爆破块度和爆破振动的影响规律。结果表明:通过提高数码电子雷管延时精度能够有效降低爆破大块率,使矿石粉矿率从28%提高到了44.5%;通过精确控制孔间、排间延期时间,能够有效降低爆破振动。

In order to solve the problems of high block rate and large blasting vibration in deep hole blasting in open-pit mines,the application research is carried out by using the characteristics of high delay precision and free setting of delay time of digital electronic detonator.Through the theoretical analysis of explosive explosion,the theoretical delay time between holes and rows in blasting network is calculated.The stress and vibration velocity around the blasting hole were analyzed and verified by numerical simulation.Combined with a large number of field blasting test data,the influence of digital electronic detonator blasting delay time on blasting fragmentation and blasting vibration was summarized.The results show that the blasting block rate can be effectively reduced by improving the delay accuracy of digital electronic detonator,and the ore powder rate is increased from 28%to 44.5%.By accurately controlling the delay time between holes and rows,the blasting vibration can be effectively reduced.