岩体爆破破坏效应颗粒流数值模拟验证研究

Numerical Simulation Verification of Blasting Failure Effect in Rock Mass with Particle Flow Code

采用颗粒流方法对岩体爆炸破岩过程进行数值模拟,将集中药包作用下的爆炸球面波等效为三角形波脉冲,根据颗粒离散元原理建立了点膨胀加载法和动边界处理法,结合动三轴试验标定的细观力学参数,建立了颗粒离散元爆炸应力波传播分析模型。利用数值模拟进行了爆破破岩机理分析,探讨了不同埋深、炸点膨胀比、炮孔压力对爆破效果的影响,给出了数值模拟时合适的炸点膨胀比与峰值压力取值范围,并根据爆破工程实践对爆破漏斗效应、微差爆破效应进行了验证。研究方法简单可靠,可反映岩体爆炸应力波传播规律,动态表征岩体的破坏过程,有助于进一步加深对工程爆破效应的认识。

The numerical simulation of the damage process in rock mass under blasting loading was carried out by the method of particle flow code.The explosion spherical wave was equivalent to the triangle wave pulse under the action of the concentrated charge.According to the particle discrete element principle,the point expansion loading method and the dynamic boundary treatment method were established.Based on the meso-mechanics parameters calibrated by the dynamic triaxial test,the particle discrete element numerical analysis model of explosive stress wave propagation was established.The effects of burial depth,blast point expansion ratio and blasting pressure on the blasting effect were discussed.Based on the practice of blasting engineering,the blasting funnel effect and millisecond blasting effect were verified.The research method can reflect the propagation law of explosive stress wave in rock mass and dynamically characterize the failure process of rock mass,which will further enhance the understanding of engineering blasting effect.