Research on Fire Smoke Control Scheme for Super-long Hgihway Tunnel without Auxiliary Passage
Based on the Cili tunnel project,this study investigates the fire smoke spread characteristics of tunnel length over 5 000 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.
super long highway tunneltunnel firefire smoke controltemperature distribution lawlongitudinal ventilation
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