预裂爆破中最佳空孔间距的选择

预留空孔是预裂爆破的常用方法,空孔间距的选择关系到爆破效果的好坏.从理论上研究了空孔的应力集中效应,得出了在空孔壁上时只有炮孔连线方向才有应力出现.分析了空孔间距与爆破参数选取的关系,基于爆炸力学和弹性力学知识从理论上推导出了最适宜的空孔间距.通过具体的算例得出了采用预留空孔爆破时2装药孔之间的间距为868.6mm,没有预留空孔时2炮孔之间的距离为543.4mm,因此预留空孔能够明显提高炸药的能量利用率.

The best choice of empty blasting hole spacing in the presplit blasting

Laying empty blast hole is a commonly effective blasting method in presplit blasting,and the quality of the blasting depends on the choice of empty hole spacing.It analyzes the stress concentration effect around the empty blast hole in theory,and there is stress only in the hole connecting direction in the wall of an empty hole.By analyzing the relationship between the empty hole spacing and the blasting parameters and combining with the theory of explosion and elastic mechanics,we can get the best choice of empty hole spacing.The best charge hole spacing is 868.6 mm when there is an empty hole between two charge holes,but the best spacing is 543.4 mm.So laying empty blast hole can enhance explosive energy utilization ration obviously.