近地面爆源爆炸成坑效应的数值模拟研究

Numerical Simulation of Craters Produced by Explosion near Ground

为研究爆炸案件中近地面爆源的爆炸成坑过程及爆坑形成影响因素,得到近地面爆源爆炸痕迹反演规律,利用非线性动力学软件AUTODYN对土壤地面在爆炸载荷作用下的动态响应进行了数值模拟研究,得到了土壤表面爆坑的形成过程及药量、炸高等影响因素对爆坑参数的影响规律。计算结果表明,爆坑形成的最初阶段,爆坑深度扩张速率最大,并随时间推移逐渐减缓,最终趋于稳定;当炸高确定时,爆坑深度随药量增大而增大,且爆坑深度与药量的立方根之间呈线性关系;当药量确定时,爆坑深度随炸高增大而减小,且爆坑深度与炸高呈线性关系;相对爆坑深度与相对炸高之间具有线性关系。

In order to study the formation process and critical factors of craters produced by explosion near the ground burst sources and to obtain the law of explosive source inversion, the dynamic response of the soil ground under explosive load was simulated by nonlinear dynamics software AUTODYN. The formation process of craters and influence of factors such as explosive weight and height of detonation on crater sizes were obtained. Simulation results show that crater depth reaches the maximum expansion rate in the initial stage of crater formation, gradually slows down over time, and finally maintains a steady value. When height of detonation is fixed, the crater depth increase with the increase of charge following a linear correlation. When charge is fixed, the crater depth decrease with the increase of detonation height with a linear correlation. Relative crater depth and relative height of detonation also have linear relationship.