温压炸药爆炸冲击波在坑道内的传播规律研究

Propagation of blast wave of thermobaric explosive inside a tunnel

温压炸药爆炸冲击波对坑道内的人员和设备构成严重威胁。在TNT爆炸试验数据验证的基础上,利用AUTODYN软件建立了炸药堵口爆炸的数值计算模型。基于JWL-Miller能量释放模型计算原理,通过与TNT冲击波的对比,研究了某型温压炸药爆炸冲击波在坑道内的传播特性;通过与空旷地面爆炸冲击波的对比,研究了坑道对温压炸药爆炸冲击波的约束作用。研究结果表明:温压炸药具有更大的破坏威力,温压炸药的超压峰值和正相冲量平均为TNT的1.91倍和1.82倍,其超压和冲量等效TNT当量系数分别为1.94和2.21;坑道对温压炸药冲击波的约束作用明显,其超压峰值和正相冲量平均值分别为空旷地面上的13.55倍和15.21倍。

Blast wave of thermobaric explosive is a serious threat to personnel and equipment inside a tunnel. Firstly, based on TNT blast test data verification, a numerical calculation model for an explosion entrance was established with the software AUTODYN. Secondly, the blast wave propagation characteristics inside a tunnel of thermobaric explosive whose state equation was described with JWL-Miller energy release model were studied through comparing with those of TNT blast wave. The constraint effect of a tunnel on the blast wave of thermobaric explosive was also investigated through comparing the propagation characteristics of thermobaric explosive side a tunnel with those on unconstrained ground. The results showed that thermobaric explosive has a greater destructive power; the average peak overpressure and positive phase impulse of thermobaric blast wave arel. 91 times and 1.82 times of those of TNT, respectively; the equivalent coefficients of average overpressure and impulse of TNT for thermobaric explosive arel. 94 and 2. 21, respectively ; the tunnel constrain effect on the blast wave of thermobaric explosive is obvious, the average peak overpressure and positive impulse of thermobaric shock wave in a tunnel are 13.55 times and 15.21 times of those on unconstrained ground.