特长公路隧道无辅助通道火灾烟气控制方案研究

Research on Fire Smoke Control Scheme for Super-long Hgihway Tunnel without Auxiliary Passage

为探究5000 m以上隧道的火灾烟气蔓延特性及无辅助通道排烟方案的可行性,以慈利隧道为例,采用FDS火灾模拟软件模拟隧道火灾情景,分析了无辅助通道时慈利隧道烟气蔓延规律及温度场、CO浓度、能见度分布情况,并将不同风速下隧道烟气蔓延规律进行对比。结果表明:1)隧道排烟风速设置为4 m/s时,不设置辅助通道对火灾上游人员疏散安全性无影响,采用全射流纵向通风能够保证人员安全疏散,且烟气不会窜流;2)慈利隧道取消辅助通道方案是可行的,该方案极大地降低了隧道的建设和运营成本。

Based on the Cili tunnel project,this study investigates the fire smoke spread characteristics of tunnel length over 5000 m and the feasibility of this condition without auxiliary channels.Tunnel fire scenarios are simulated by FDS fire simulation software,the smoke spread law,temperature field,CO concentration,and visibility distribution of Cili tunnel without auxiliary channels were analyzed.The smoke spread law of the tunnel under different wind speeds was compare.The results indicate that:1)The absence of auxiliary channels in the tunnel has no impact on the safety of personnel evacuation upstream of the fire,when the smoke exhaust velocity is 4 m/s.2)The use of full jet longitudinal ventilation can ensure safe evacuation of personnel,and smoke will not flow.It is feasible to cancel auxiliary channels in Cili tunnel,which largely reduces cost of the tunnel construction and operation cost.