爆炸落石形成过程数值模拟研究

Numerical Simulation of Formation Process of Explosion Rockfalls

运用AUTODYN程序模拟了爆炸落石的形成过程,并结合岩石爆破基本理论,分析了爆炸落石的形成及抛掷速度分布规律。爆炸落石形成过程模拟表明,爆炸落石最早沿抵抗线方向形成并逐渐向两侧扩展,同时由于受到相互碰撞和摩擦作用,爆炸落石在破坏区附近的运动状态很不稳定。爆炸落石抛掷速度分布显示,在同一边坡切面上,沿最小抵抗线方向的爆炸落石抛掷速度大于非抵抗线方向的爆炸落石抛掷速度,且在同一坡面高度上,爆炸落石速度与到爆心的距离成正比。

The software AUTODYN is applied to simulate the formation process of explosion rockfalls,and the formation and distribution regular of tossed velocity of explosion rockfalls are analysed with the theory of blasting.The simulation results show that they form at burden orientation at first,then they move to the sides of burden.Owing to the collision and friction with each other,the motion of explosion rockfalls is unsteady.The distribution of tossed velocity indicates that the tossed velocity values of explosion rockfalls at burden orientation are larger than other explosion rockfalls at nonburden orientation,and the tossed velocity values is in proportion to the distance from explosion center to the positon where the rockfall formed.