节理岩体爆破数值模拟研究

Numerical simulation of blasting in jointed rock mass

为了研究节理对岩体中应力波与爆炸能量传播的影响规律,利用动力有限元分析程序LS-DYNA分别对不同数量、宽度与充填强度的节理岩体爆破进行了数值模拟。模拟研究发现,不同赋存状态的节理均会影响爆炸应力波的传播,随着节理数量与宽度增多,波的反射增强,透射波强度减弱,应力波衰减程度加快,而充填强度越小,对应力波的阻隔作用越明显;爆炸能量在节理数量少、宽度小及充填强度大的岩体中衰减较慢,能量利用率高,爆破效果更好。

In order to study the effect of the stress wave and blasting energy propagation in rock mass,using dynamic finite element analysis program of LS-DYNA to make the numerical simulation of jointed rock blasting with different quantity,width and filling strength. The simulation results revealed that the different states joints will influence the propagation of the blasting stress wave. With the increase of the jointed quantity and width,the reflected wave is enhanced and the transmitted wave intensity is weakened,the fading degree of the stress wave was accelerated,and the smaller the filling strength was,the more obvious the obstruction of stress wave was; the fading of blasting energy was slower in rock mass with less jointed number,small width and large filling strength,the energic utilization rate was higher,and the blasting effect was better.