分段装药结构爆破效果的数值模拟研究

摘要

This paper numerically simulates the stress development and generates a three-di-mensional model of the medium-deep hole blasting in infinite rock mass for continuous charge and divided charge in blasting by using the large-scale nonlinear dynamic analysis software LS-DYNA and the elastic-plastic model*MAT_PLASTIC_KINEMATIC and JwL. The difference of the decreasing rate in Von Mises effective stress of blasting,element effective stress peak in free face,the bore wall stress and acceleration are investigated. It is shown that divided charge could greatly improve the blasting effect by engineering blasting practice.%基于大型非线性动力分析软件LS-DYNA，选用弹塑性模型*MAT_PLASTIC_KINEMATIC和JWL方程，建立无限岩体介质中中深孔爆破时连续装药结构和分段装药结构三维模型，并进行了数值模拟，再现了两种装药结构爆破过程中的应力发展过程，对比分析了它们在Von Mises有效应力分布、自由面有效应力峰值、孔壁压力分布及加速度等衰减上的差异。结合工程现场爆破实践验证了分段装药结构可以明显改善爆破效果。