方形坑道内爆炸冲击波传播规律

Experimental Study on the Propagation Law of Blast Waves in a Square Tunnel

为研究方形坑道内的爆炸冲击波传播规律,开展了1.00,3.25 kg和10.28 kg三种质量的梯恩梯(TNT)药柱坑道内爆炸试验,记录了不同距离处的冲击波压力曲线,得到了冲击波到达时间、超压峰值、冲量等参量。结果表明,坑道内爆炸冲击波的传播分为三个阶段:自由场球面波传播、一维平面波传播和二者之间过渡阶段;除临近爆心处之外,超压峰值满足立方根比例定律,拟合得到了计算偏差不大于10%的超压峰值计算经验公式,冲量不满足立方根比例定律。

In order to study the propagation law of blast shockwaves in a square tunnel,TNT charges with different mass of 1.00 kg,3.25 kg and 10.28 kg were detonated separately in the tunnel. The shock wave pressure-time curves at different distances were recorded and the parameters of shock waves such as the arrival time,the peak overpressure and the impulse were obtained. Results show that the propagation of shockwaves in tunnel is divided into three stages:the free-field spherical wave propagation,the one-dimensional planar wave propagation and the transition between them. The peak overpressures fit the Hopkinson-Cranz scaling law well except near the explosion center. An empirical formula for calculating peak overpressures was fitted,and the deviation between fitting results and measured values was not more than 10%. However,the impulse does not agree with Hopkinson-Cranz scaling law.