Abstract: Through the method of measurement and simulation, two collaborative smoke exhaust schemes of "rail top exhaust hot air duct" and "smoke exhaust duct", are studied and compared. The results show that, the schemes of "rail top exhaust hot air duct" is effective. In the study of 8A station, the side smoke exhaust flow accounts for more than 50% of the total smoke exhaust flow, and the air leakage flow of metro platform screen door is close to 20 m3/s. The downward wind speed at the stairs can reach much higher under the schemes of "rail top exhaust hot air duct". However, under the schemes of "smoke exhaust duct", there is a risk that the wind speed can't reach the standard when the opening area of stairs is pretty large, because of tunnel fans in power off state. It is recommended to give priority to the scheme of "rail top exhaust hot air duct" when the station conditions are poor.

Key words: subway platform, collaborative smoke exhaust, rail top air duct, sideways valve, numerical simulation