运动炸药近地爆炸冲击波场特性研究

Characteristics Investigation on Shock Wave Field of Near Ground Blasting of Moving Explosive Charge

为研究运动炸药近地爆炸冲击波场分布特性,运用AUTODYN软件对不同运动速度炸药近地爆炸过程进行数值仿真,地面超压峰值仿真结果与等效经验公式计算值符合程度较好。通过对扰动压力场、爆炸初始压力场以及地面特征位置峰值超压的对比分析,得到炸药运动速度对近地爆炸冲击波场分布的影响规律。研究结果表明:炸药运动速度对地面冲击波峰值超压有增益作用,随着炸药运动速度的增加该增益作用增强;炸药运动速度对地面峰值超压的增益作用随比例距离的增加逐渐减弱,3倍比例距离外可认为无明显差异。

To study the characteristics of near ground blasting shock wave field of explosive charge moving at different velocities,the simulations were carried out by using AUTODYN software. The simulation results of peak overpressure near ground was in good agreement with the computing results obtained by equivalent empirical equation.Then the disturbance pressure field,initial explosive pressure field,peak overpressure at characteristic ground location were compared and analyzed,and the influencing rules of moving velocity on distribution of shock wave near ground were obtained. The simulation results showed that the charge moving velocity exerted positive influence on the peak near ground overpressure,meanwhile the positive influence increased along with the increasing of charge moving velocity. This positive influence decreased along with the increasing of characteristic ground position,and no difference can be found at the position for more than triple scale distance.