Abstract:In order to verify the effectiveness of the air flow smoke control mode of the accident tunnel longitudinal ventilation and the non-accident tunnel positive pressure air supply, a 1:3 entity test platform was established based on the similar rectangular metro tunnel. The smoke control effects of the two longitudinal ventilation modes, the temperature along the non-accident tunnel and the temperature of the connecting passage were compared and analyzed. The results showed that the effective smoke control methods, such as longitudinal ventilation of accident tunnel and positive pressure ventilation of non-accident tunnel, can not only be applied in the subway tunnel without fire doors in space, but also can be used as an emergency means to reduce the fire hazard after the fire doors of conventional subway tunnel are damaged. It can be seen that under the effective positive pressure air supply mode, the critical wind speed of the accident tunnel was 1.6m/s, the critical wind speed of the 1#A cross passage was 1.7m/s, and the critical wind speed of the 1#B cross passage was 1.8m/s. This parameter can provide the basis for the selection of the tunnel fans in the subway section.