粒状铵油炸药轴向连续装药预裂爆破数值模拟及应用研究

针对乳化药卷供应不足制约预裂爆破进展的问题,探索了一种新的装药结构模式,即采用低威力的多孔粒状铵油炸药轴向连续、径向不耦合的装药方式。在理论上验证了该装药结构的可行性,同时采用LS-DYNA软件数值模拟的手段,对照矿山实际孔径建立1∶1模型,对比分析了与传统乳化药卷不耦合装药结构的差别,得出了粒状铵油炸药轴向连续装药在保护孔壁及裂纹扩展方面具有优势的结论,确定了适合莱比塘矿山岩性的PVC管直径为40 mm,最优孔间距为1.8 m,并在现场实践中得到了验证。

Numerical Simulation and Application of Pre-splitting Blasting with Granulated ANFO Axial Continuous Charge

Aiming at the problem of insufficient supply of emulsion explosive on pre-splitting blasting,a new charging structure model was explored,that is,an axially continuous and radially uncoupled charge with granulated ANFO.The feasibility of the charging structure is verified theoretically.At the same time,LS-DYNA software numerical simulation was used to establish a 1∶1 model comparing with the actual hole size of the mine,and the difference between the uncoupled charge structure and the traditional emulsion cartridge was compared and analyzed.It is concluded that the axial continuous charge of granulated ANFO has advantages in protecting hole wall and crack propagation.The diameter of PVC pipe suitable for lithology of Laibetang mine was determined to be 40 mm,and the optimal hole spacing was 1.8 m,which was verified in field practice.