刚性地面对爆炸冲击波传播规律的影响

为研究刚性地面对爆炸冲击波传播特性的影响,采用ANSYS/LS-DYNA对TNT炸药在刚性地面工况下起爆后的整个过程进行了数值分析,得到了刚性地面工况下爆炸冲击波的传播规律以及特征参数,并将其与自由空气工况下爆炸冲击波的传播规律以及特征参数进行了对比分析。建立了TNT炸药在刚性地面工况下起爆后,比例距离在0.5 m/kg^(1/3)≤Z≤3 m/kg(1/3)≤Z≤3 m/kg^(1/3)之间时的冲击波超压峰值简便计算公式,分析了起爆高度对刚性地面附近冲击波的影响规律,并得到了刚性地面反射增强效应作用范围的判别公式。数值分析所得结果可为结构或构件在刚性地面上发生爆炸时荷载的初步确定提供一定的参考。

Influence of rigid ground on propagation characteristics of blast wave

In order to study the propagation characteristics of blast wave on rigid ground, the propagation process of TNT explosive on rigid ground was analyzed based on the finite element analysis software ANSYS/LS-DYNA. The propagation law and characteristic parameters of blast wave on rigid ground and in free air were compared and analyzed. A formula for calculating the peak of overpressure on rigid ground at a proportional distance between 0.5 m/kg(1/3)之间时的冲击波超压峰值简便计算公式,分析了起爆高度对刚性地面附近冲击波的影响规律,并得到了刚性地面反射增强效应作用范围的判别公式。数值分析所得结果可为结构或构件在刚性地面上发生爆炸时荷载的初步确定提供一定的参考。In order to study the propagation characteristics of blast wave on rigid ground, the propagation process of TNT explosive on rigid ground was analyzed based on the finite element analysis software ANSYS/LS-DYNA. The propagation law and characteristic parameters of blast wave on rigid ground and in free air were compared and analyzed. A formula for calculating the peak of overpressure on rigid ground at a proportional distance between 0.5 m/kg^(1/3) and 3.0 m/kg(1/3) and 3.0 m/kg^(1/3) was obtained. The influence of blasting height to the propagation law of blast wave near rigid ground was studied and the influence scope of rigid ground reflection was amended. The numerical results of this paper can provide some references that valued on the estimation of the blast load on rigid ground.