地铁车站内爆炸冲击波传播规律数值模拟

Numerical simulation of propagation law of blast wave inside a subway station

采用AUTODYN对6.5 kgTNT炸药在江苏苏州某地铁站台中心地面爆炸后冲击波传播过程做数值模拟,分析冲击波在站台层的传播规律及冲击波沿楼梯、站台纵向的衰减规律,绘制出距站台地面1.5m高处冲击波杀伤范围云图。计算结果表明,地铁车站内冲击波衰减缓慢,柱间狭长区域超压高于两侧开阔地带。离炸药约20 m外不伤及人体;距炸药12 m内杀伤范围线不规则;在柱间肺损伤概率较两侧开阔空间高。离炸药4 m区域均在1%死亡线内,越靠近装药中心死亡概率越高。

Here, the propagation process of blast wave was simulated with AUTODYN after 6.5kg TNT explosive blasted at the floor of a subway station. The propagation laws of blast wave along the platform, the staircase plane and the lengthways of the station were analyzed to plot a splash radius contour of 1.5m high place from the floor. It was shown that in the subway station, the shock wave＇s attenuation is slow, and the overpressure between columns＇ channel areas is higher than that of the both sides open areas relatively; in the subway station, after the TNT blasted, there are no casualties over about 20 m far from the TNT; within about 12 m far from the TNT, the casualties range line is irregular; the lung injury probability between columns is higher than that of the both sides open areas relatively; the area within 4m far from the TNT is included in the 1% dead line, and the closer to charging center, the higher the risk of death.