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在考虑人为恐怖袭击行为情况下,采用地铁轨道区模型实体火灾试验研究了地铁轨道区的火灾场景。得出了模拟地铁轨道区在火灾中的热释放速率,烟气浓度,温度,烟密度的变化规律。通电模拟短路以致引燃方式着火的最大热释放速率为9.66kW。浇洒煤油方式点火,轨道区最大热释放速率达到了204kW。随着电缆的点燃,燃烧进行的较为缓慢,烟气上升至隧道顶,沿着顶部向开口外扩散。CO2的浓度变化较为缓慢。至10’41“达到CO2释放峰值5027.7ppm;至10’41”时CO浓度达到最大354.0ppm。在轨道区间燃烧过程中,高温烟气始终沿着隧道顶部扩散,低于1.5m的空间是相对安全的;高于1.7m的空间是相对危险区域。火灾中烟气是首先弥漫整个房顶,然后再往下漫延的。
Considering the man-made terrorist attacks, the fire scene of the metro orbit zone was studied by using the model physical fire test in the metro orbit zone. The simulation results show that the heat release rate, flue gas concentration, temperature and smoke density in the metro orbit zone are similar to each other. The maximum thermal release rate for ignition by pilot ignition was 9.66 kW when energized to simulate a short circuit. Sprinkled kerosene ignition, orbital area maximum heat release rate reached 204kW. As the cable was lit, the combustion proceeded more slowly, with the fumes rising to the top of the tunnel, spreading out to the top along the top. CO2 concentration changes more slowly. To 10’41 “to reach the peak CO2 release 5027.7ppm; to 10’41 ” when the CO concentration reaches a maximum of 354.0ppm. During the combustion in the orbital section, the high temperature flue gas always diffuses along the top of the tunnel, and the space below 1.5m is relatively safe; the space above 1.7m is the relatively dangerous one. The flue gas in the fire is the first to fill the roof, and then spread down.