不同隧道排烟模式对站台火灾人员疏散的影响

为探究站台火灾条件下不同隧道排烟模式对地铁人员疏散的影响，以岛式地铁站为研究对象，利用Pyrosim建立火灾模型，并分析4种隧道排烟模式下的楼扶梯入口风速、烟气温度、CO体积分数和能见度的分布。结果表明：单一隧道排烟模式均无法满足安全疏散要求；疏散时间360 s内，在人眼特征高度处，车站隧道排烟模式下的人员疏散经过区域的能见度不能满足疏散要求，CO体积分数、温度、楼扶梯口风速均满足安全疏散要求；3种区间隧道排烟模式下的楼扶梯口风速均无法满足人员安全疏散要求，区间隧道推拉式反向排烟模式最不利于疏散区域烟气散热，区间隧道双拉式排烟模式排烟效果最为显著；火灾烟气的3个潜在危险因素中，相比于温度和CO体积分数，满足能见度在安全范围内的难度更高。

Influence of different smoke exhaust modes onpersonnel evacuation in subway station fire

In order to explore the influence of differenttunnel 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 toestablish 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 therequirements of safe evacuation; within 360 s of evacuation time, at the humanfeatures eye height, the visibility of the evacuation area in the stationtunnel smoke exhaust mode cannot meet the evacuation requirements, CO volumefraction, temperature, and the wind speeds at the escalator entrance meet therequirements for safe evacuation; the wind speeds at the escalator entranceunder the three tunnel smoke exhaust modes cannot meet the requirements forsafe evacuation of people. The push-pull reverse smoke exhaust mode of thesection tunnels is the most unfavorable for the heat dissipation of the smokein the evacuation area. The double-pull smoke exhaust mode has the mostsignificant smoke exhaust effect; among the three potential hazards that canaffect evacuation caused by fire smoke, it is more difficult to meet thevisibility within a safe range than temperature and CO volume fraction.