Abstract: In order to clarify the smoke control effects of different smoke exhaust design schemes in the single crossover distribution section, a single crossover distribution section of a certain subway line was selected. Through on-site measurement and smoke flow numerical simulation analysis, the factors affecting the overall smoke exhaust capacity and airflow organization distribution of the tunnel section were obtained. The results show that under the single crossover form, the smoke exhaust capacity of the tunnel ventilation system mainly depends on the TVF fan. In the case of no jet fan and only relying on the TVF fan, adopting a 2-supply 2-row mode can meet the requirements of the cross-sectional wind speed in the fire section, and there is no phenomenon of smoke flow crossing the crossover line; The number of TVF units activated significantly increases the wind speed in the fire zone, but using the 4-to-4 exhaust mode will cause smoke to pass through the station.

Key words: single crossover; smoke exhaust design; on site testing; numerical simulation