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When there are traffic jams in the tunnel, if the critical velocity is used for longitudinal smoke exhaust, it will pose a threat to the vehicles and people congested downstream. Using FDS + EVAC for numerical simulation, this paper has studied the fire smoke control strategies and transverse passageway intervals. The results show that: (1) When there is congestion at the downstream of the fire source, excessive longitudinal smoke exhaust will reduce the available safe evacuation time (ASET) in the downstream area of the fire source, and the longitudinal velocity should be controlled within 1 m/s. (2) When the transverse passageway for vehicles cannot be used for evacuation, the time necessary for safe evacuation increases by 43%. In order to ensure the safe evacuation, the transverse passageway intervals should be no more than 400m, and the transverse passageway for vehicles should have the function of pedestrian evacuation.

Study on Tunnel Fire Smoke Control and Transverse Passageway Interval under Traffic Congestion