Abstract:

In order to explore the influence of different tunnel smoke exhaust modes on subway evacuation in the case of platform fires, an island-style subway station was used as a prototype, and Pyrosim was used to establish a fire model, and the wind speed at the escalator entrance，smoke temperature, CO volume fraction and visibility were analyzed. The results show that: a single tunnel smoke exhaust mode can't meet the requirements of safe evacuation; within 360 s of evacuation time, at the human features eye height, the visibility of the evacuation area in the station tunnel smoke exhaust mode cannot meet the evacuation requirements, CO volume fraction, temperature, and the wind speeds at the escalator entrance meet the requirements for safe evacuation; the wind speeds at the escalator entrance under the three tunnel smoke exhaust modes cannot meet the requirements for safe evacuation of people. The push-pull reverse smoke exhaust mode of the section tunnels is the most unfavorable for the heat dissipation of the smoke in the evacuation area. The double-pull smoke exhaust mode has the most significant smoke exhaust effect; among the three potential hazards that can affect evacuation caused by fire smoke, it is more difficult to meet the visibility within a safe range than temperature and CO volume fraction.

Key words:

platform fire, tunnel smoke exhaust, fire parameters, personnel evacuation, numerical simulation