爆破参数对预裂爆破裂纹扩展规律研究

预裂爆破是一种控制爆破，为保证预裂爆破的良好效果，需要对岩石裂纹扩展情况进行研究。通过数值模拟的方法，对孔距和不耦合系数等爆破参数对岩石双孔爆破裂纹扩展规律进行研究。研究发现：随着不耦合系数的增加，主裂隙的平均长度先增大后减小，孔壁所承受的冲击压力显著减小；双孔连线中点处的拉伸应力随孔间距的增大而降低。但是随着不耦合系数及孔距增大，双孔裂纹难以贯通，不能够达到预期的预裂效果。合理确定不耦合系数以及孔距，这对矿山爆破严格控制装药量，科学布置炮孔等采取合理的爆破参数精确的控制爆破效果具有重大意义。

Influence of blasting parameters on the crack propagation law of pre-splitting blasting

Pre-split blasting is a kind of controlled blasting, in order to ensure the good effect of pre-split blasting, it is necessary to study the rock crack propagation. Using numerical simulation, the law of crack propagation in rock double-hole blasting caused by blasting parameters such as hole distance and the uncoupling coefficient is studied. The results show that with the increase of the decoupling coefficient, the average length of the main fracture first increases and then decreases, and the impact pressure on the pore wall decreases significantly. The tensile stress at the middle point of the double hole line decreases with the increase of hole spacing. However, with the increase of the uncoupling coefficient and hole distance, it is difficult for the double-hole crack to connect and the expected pre-cracking effect cannot be achieved. It is of great significance to determine the decoupling coefficient and hole distance reasonably, which is of great significance to strictly control the charge amount of mine blasting, scientifically arrange the holes and adopt reasonable blasting parameters to accurately control the blasting effect.