Effect of Segmented Charge on Explosive Fragmentation of Coal Mine Rock
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摘要:为增强深部煤矿岩石爆炸破碎效果，提出了一种分段装药的爆破方法。基于SPH（光滑粒子流）方法，对不同分段比例装药结构下岩体破碎情况、岩石飞散速度以及爆破成腔效果进行了分析，使用分形维数比较了不同装药结构下岩石的破碎效果。研究表明，孔底起爆效果比孔口起爆效果好，普通连续装药结构不能最大化利用爆炸的破岩效果，采用分段装药的方法能为下部岩体破碎增加临空面。当上部装药比例为0.4时，炸药对岩体的破碎效果最好。
Abstract:In order to enhance the explosive fragmentation effect of deep coal mine rock, a blasting method of sectional charging was proposed. Based on the SPH (smooth particle hydrodynamics) method, the rock fragmentation, the speed of rock scattering and the effect of blasting cavity formation under different segmented charge structures were analyzed. The fractal dimension was used to compare the rock crushing effects under different charge structures. Studies show that the detonation effect at the bottom of hole is better than that at the orifice. Ordinary continuous charge structure cannot make full use of the rock breaking effect of the explosion. The use of segmented charge method can increase the surface of the lower rock mass. When the upper charge ratio is 0.4, the explosive has the best crushing effect on the rock mass.
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