起爆位置对岩石破碎的影响研究

Research on effects of initiation position on rock crushing

为了高效利用露天台阶爆破炸药能量,采用数值模拟与实验相结合的方法,研究了起爆位置对炸药破岩范围的影响,提出了高效利用炮孔内炸药能量和扩大破岩范围的方法;结果表明,在连续装药条件下,起爆点位置影响炸药能量在岩体中的分布,并影响岩体破碎范围,对大块和爆破根底占比有直接影响,相比孔底起爆,提高起爆点位置到药柱中下部,能够扩大台阶底部破岩范围,减少爆破根底,从总体上对改善爆破质量有利。

In order to make full use of explosive energy in open-pit bench blasting, the article adopts numerical and experimental methods, studies the effect of detonation position on rock fragmentation, presents the efficient use of explosive energy and expands rock-breaking range. The results show that detonation position affects explosive energy distribution in rocks, which affects area of rock fragmentation, and affects blasting boulders and toe rocks directly. Raising detonation position to middle part and bottom of charge can enlarge rock crushing range, and reduce blasting bottom, which generally benefits for blasting quality.