水不耦合径向装药对预裂成缝效果影响分析

Analysis on Influence of Water Uncoupled Radial Charge on Pre-crack Formation Effec

为研究空气和水两种介质对预裂爆破的影响,通过LS-DYNA软件,研究不同不耦合系数情况下大理岩HJC本构模型在空气和水介质条件的单孔爆破损伤情况和多孔爆破成缝情况。结果表明:1)不耦合系数相同情况下,水不耦合装药岩石损伤范围会大于空气不耦合装药。随着径向不耦合系数增大,大理岩在空气不耦合装药和水不耦合装药条件下的损伤范围均逐渐减小,这可以有效保护孔壁岩体。2)水不耦合装药与空气不耦合装药的应力传播规律相同,但水不耦合装药相较于空气不耦合装药,对爆炸能量的利用率更高。3)针对岩石条件,得到了最优的爆破参数组,在现场取得较好的预裂爆破效果。

In order to study the influence of air and water media on pre-crack blasting,the single-hole blasting damage of the marble HJC intrinsic model and the porous burst seam condition under different uncoupling coefficients were studied through LS-DYNA software.The results show that:1)Under the same uncoupling coefficient,the damage range of water uncoupled charge is larger than that of air uncoupled charge.With the increase of the radial uncoupling coefficient,marble under the condition of the air uncoupling charge and water uncoupling charge damage range will gradually decrease.It can effectively protect the hole wall rock mass.2)The stress propagation law of water uncoupled charge and air uncoupled charge is the same,but water uncoupled charge has a higher utilization rate of explosive energy than air uncoupled charge.3)According to the rock conditions in this paper,the optimal blasting parameters are obtained,and a good pre-crack blasting effect is achieved in the field.