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本文根据在德兴铜矿露天台阶上进行的近百次单孔漏斗、台阶单孔、单排孔和双排孔微差爆破等各类小型试验结果及实验室模拟爆破的部分成果,就药包直径、孔网参数和微差间隔时间等爆破参数对矿岩破碎的影响作了较系统的探讨。通过对试验资料的整理分析,指出矿岩破碎程度取决于药包平均抵抗线,并试用数学解析法解释采用小抵抗线爆破时岩体内剪断破坏几率增多、导致矿岩破碎质量改善的原因,本文还根据高速摄影和测震结果,提出了选定合理间隔时间的原则及其计算公式。
In this paper, Dexing Copper Mine on the open steps of nearly a hundred times single hole funnel, step single hole, single hole and double row hole millisecond blasting and other small test results and laboratory simulation of some of the results of the blasting, the medicine The influence of blasting parameters, such as package diameter, hole network parameters and microsequence interval, on the rock fragmentation was systematically discussed. Through the analysis of test data, it is pointed out that the degree of ore rock fragmentation depends on the average resistance line of the drug pack, and the mathematical analysis method is used to explain the reason that the shearing failure probability of rock mass increases with small resistance line blasting, Based on the results of high-speed photography and seismometry, this paper also puts forward the principle of selecting reasonable interval time and its calculation formula.