摘要
为了探索爆炸空气冲击波在巷道内的传播规律,进行了数值计算和理论分析,讨论了爆炸冲击波通过45°弯曲巷道后的压力变化过程。研究结果表明:爆炸空气冲击波通过45°弯曲巷道后的压力分布复杂,空气冲击波逐渐恢复为平面波需经过4倍等效巷道直径的距离传播。在该4倍等效距离内,冲击波反射叠加,在巷道外侧壁面Mach反射点取得超压最大值,恢复平面波以后超压随距离呈单调衰减。
This paper is aimed at presenting the authors＇ numerical calculation and their theoretic analyses of the air shock wave propagation process as well as the corresponding principles in case of the explosion taking place in the mining tunnel. For this purpose, a piece of particular research into the overpressllre changing process when the explosion shock wave goes through 45° turning corner. As is known, since inside a tunnel, its wall is limited in its rigidity, the propagation of shock wave must differ from that in an open space. According to the results of our research, the overpressure tends to increase noticeably with the air shock wave becoming more complicated and therefore difficult to give a clear description at a turning corner inside. Nevertheless, it is there the outer wall of the tunnel that has to suffer the peak overpressure and then begins to attenuate quickly in a radial form with its minimum overpressure at the inner wall side. It is just for this reason that the peak overpressure strength can thus be estimated by the shock wave reflection formula. That is to say, the air shock wave should resume to plane front form after propagation continuing through a distance of 4 times equivalent to the tunnel diameter, which can therefore be calculated in accordance with the crosssection area, till then the overpressure would have been attenuating monotonously with the distance increase from the epicenter of the explosion.
出处
《安全与环境学报》
CAS
CSCD
2007年第3期105-106,共2页
Journal of Safety and Environment
关键词
安全工程
空气冲击波
爆炸
传播规律
safety engineering
air shock wave
explosion
propagation rule
