Abstract: In order to determine the reasonable mode and parameters of smoke exhaust in the case of fire in a new type of separated metro station, the deep-buried metro station whose station hall and platform is connected by a long escalator channel was taken as the research object, and the numerical simulation was used to analyze the smoke movement process and its prevention and control methods in different areas of the station and escalator passages when the fire occurred. The results show that the smoke exhaust of the platform area fire needs to adopt the reasonable matching operation mode between the station and the tunnel fan, that the fire in the lobby floor and the long passage only needs to open the smoke exhaust fan of the hall to make the wind speed of the stairs reach the critical wind speed requirement, and that the proposed smoke exhaust mode and parameters are applicable to the fire smoke prevention and exhaust design of this type of station.

Key words: deep-buried metro station, fire, smoke movement, critical wind speed, ventilation and smoke exhaust