沙土地面对柱形装药近地爆轰波的影响

Influence of Sand Land on Near-earth Detonation Wave of Cylindrical Charge

为了研究沙土地面对柱形装药冲击波传播的影响,运用AUTODYN-2D对不同爆高、不同入射角度的柱形装药对刚性地面和沙土地面近地爆炸进行数值模拟。通过对比不同爆高下装药垂直地面的数值模拟,发现爆高小于0.5 m时,沙土地面的凹坑会对冲击波形成聚集效应,使得沙土地面附件的峰值超压大于刚性地面;爆高大于0.5 m时,沙土地面的吸能效应占据主要因素,使得刚性地面附件的峰值超压大于沙土地面,沙土地面的峰值超压相较于刚性地面平均衰减率约为20%;由于沙土地面松软特性,会增加正压作用时间,正压作用时间增加至少0.6 ms。通过对比装药不同方位角的数值模拟,方位角在0°~90°时装药两侧峰值超压有明显差异,方位角为0°时装药两侧峰值超压较大,毁伤效果更好。

In order to study the influence of sandy land on the shock wave propagation of cylindrical charge, AUTODYN-2D was used to numerically simulate the explosion of cylindrical charge with different burst heights and different incident angles on rigid ground and sand ground near the ground. By comparing the numerical simulation of the vertical ground with different burst heights, it is found that when the explosion height is less than 0.5 m, the pits on the sand soil ground will form aggregation effect on the shock wave, which makes the peak overpressure of the sand soil ground attachment greater than that the rigid ground. When the burst height is greater than 0.5 m, the energy absorption effect of sand soil ground occupies the main factor, so that the peak overpressure of rigid ground accessories is greater than that of sand soil ground, and the average attenuation rate of peak overpressure of sand soil ground is about 20% compared with that of rigid ground. And due to the soft characteristics of sandy soil ground, it will increase the positive pressure time, and the positive pressure time increases by at least 0.6 ms. By comparing the numerical simulation of different azimuth angles of the charge, the peak overpressure on both sides of the charge is significantly different when the azimuth angle is 0°~90°. When the azimuth angle is 0°, the peak overpressure on both sides of the charge is larger, and the damage effect is better.