关键词: 光面爆破 低能量密度炸药 连续装药 数值模拟 工程应用 爆破效果

Abstract: In order to improve the forming quality of smooth blasting,a technology of continuous charge smooth blasting with low energy density explosive is proposed.LSDYNA is used to simulate and compare the stress field of interval charge of 2# rock emulsified explosive and continuous charge of low energy density explosive.Then the technology is applied to controlled blasting of No.4 tunnel of Changjiu (Shenshan) limestone mine and smooth blasting of openpit slope.The results show that in the interval charge model of 2# rock emulsified explosive,the peak stress of charge section and noncharge section is quite different; in the continuous charge model of low energy density explosive,the peak stress of the same detonation center distance along the borehole axis is consistent; the continuous charge with low energy density explosive can avoid excessive damage of charge section and over excavation of noncharge section.It has high residual porosity,saves the binding time of detonating cord,improves the charging efficiency of surrounding holes and saves the blasting cost.

Key words: smooth blasting,low energy density explosive,continuous charge,numerical simulation,engineering application,blasting effect