提高坚硬致密矿岩中大直径深孔侧向崩矿质量的分析

本文分析了爆炸能中冲击能与膨胀能的分配、起爆方式及炮孔装药结构等三个方面。以坚硬矿岩中大直径深孔侧向崩矿质量的影响。指出对坚硬致密矿岩体应选用波阻抗值较高的炸药进行爆破,并选择增大起爆能与合理起爆方式,以增大冲击能比例,提高破碎质量。在装药结构方面,应尽量试验采用柱状中空药包或采用连续装药方式进行爆破作业,少用甚至取消轴向间隔装药方式。

ANALYSIS ON IMPROVING EFFECTIVENESS OF LARGE DIAMETER LONG-HOLE SIDE-BLASTING METHOD IN HARD ROCK MASS

In the paper, the factors included distribution ratio of impact energy and expansion energy in blasting, detonating style and charge system affecting the effectiveness of large diameter long-hole side- blasting method in hard mass were analyzed. In order to improve the blasting effectiveness, the author pointed out that the high wave impedance value explosion and the rationa detonating style with higher detonating energy should be preferred, so that the impact energy can be increases in blasting, meanwhile, the mode of hollow columnar loading and continuous loadnig should be used as much as possible, and axial interval loading should be used as less as possible even be cancelled.