爆破震动场动力有限元模拟中爆破荷载的等效施加方法

比较了，应用LS—DYNA软件进行爆破震动场数值模拟时的几种不同计算方法的优缺点．结合各方法的特点及爆破震动场模拟的要求，提出了爆破荷载的等效施加方法，即将作用在炮孔壁上的爆破荷载依据圣维南原理等效后，施加在同排炮孔联心线或者面上，以模拟爆炸作用．数值模拟结果表明，不同的爆破荷载施加方法对应的数值模拟结果在近区存在一定差异，但在中远区吻合得较好．因此，使用施加等效爆破荷载的方法对中远区的爆破震动场进行数值模拟是可行的，且该法极大地降低了计算耗费．

An equivalent approach for acting blasting load in dynamic finite element simulation of blasting vibration

The advantage and disadvantage of two different methods for the simulation of blasting vibration using LS-DYNA are compared. Being considered the characteristics of different methods and the requirement of blasting vibration simulation, the equivalent approach for the acting of blasting load is proposed; i.e. according to Saint-Venant principle, the blasting load on the boreholes are equivalently converted; and then the equivalently converted forces are acted on the line or the plane face that defined by the borehole centers, so as to simulate the blasting. The results from numerical simulation indicate that there is some distinction among the near-field response for different methods, but the dynamic response in the middle and far field agrees well each other. The equivalent approach for the acting of blasting load is feasible for the numerical simulation of blasting vibration in the middle and far field, and which has largely reduced the calculation cost.