关键词: 矿山爆破, 岩巷掘进, 钻爆法, 数码电子雷管, 炮孔利用率

Abstract: Aiming at the problems such as unsatisfactory blasting effect and long single cycle time in the current cut blasting,the blasting experiment was carried out in the third middle yard of horth-1 coal roof track in Gubei Mine,the original blasting scheme was improved and the blasting parameters were optimized. The digital electronic detonator is introduced for the first time in the underground rock tunneling,and the digital electronic detonator is used to replace the common electronic detonator permitted in coal mine,and the blasting section is increased. According to the field situation of rock roadway,two new quasiwedge compound cut blasting schemes are designed by using the advantage that digital electronic detonator can arbitrarily set the delay time of blasting section. By comparing the blasting effects of the three schemes,the utilization rate of borehole is improved to 96. 1%,and the single-cycle footage is increased to 1. 78 m,which is 12. 8% higher than the original scheme. The results show that the reliability of digital electronic detonator is high,and the delay time of blasting section is preliminarily determined when the utilization rate of borehole is the highest. The use of digital electronic detonator in rock tunneling can make the blasting process controllable,have sufficient blasting space except the cut hole,increase the single cycle footage,reduce the single cycle time,improve the quality of tunnel forming,improve the work efficiency,and have good economic and social benefits.