地铁站台火灾不同排烟模式对人员疏散的影响

为研究火灾场景下不同排烟模式对人员疏散的影响，以某双层岛式地铁车站为原型，通过FDS软件建立火灾模型，分析4种排烟模式下地铁站台的火灾烟气温度、CO体积分数、能见度的分布。规定疏散时间360 s内，在人眼特征高度1.6 m处：自然排烟模式下的人员疏散途径区域出现温度大于60 ℃、CO体积分数大于250×10^-6、能见度低于10 m的区域；车站隧道排烟模式下的人员疏散途径区域出现能见度低于10 m的区域；车站公共区排烟模式和车站公共区及车站隧道混合排烟模式下，人员疏散途径区域火灾烟气温度、CO体积分数、能见度均低于疏散指标。

Influence of smoke exhaust modes on personnel evacuation in subway station

In order to study the effects of different smoke exhaust modes on the evacuation in a fire scenario, a double-deck island subway station was taken as example, the fire model was established by FDS, and the distribution of fire smoke temperature, CO concentration and visibility of subway stations under 4 exhaust modes were analyzed. Within the specified evacuation time of 360 s, at the height of the human eye as 1.6 m, the evacuation route under the natural smoke exhaust mode has the area which temperature is greater than 60 ℃, CO volume fraction is greater than 250 ×10-6, and visibility is less than 10 m. Under the evacuation mode of the smoke exhaust, there is an area with visibility less than 10 m in the evacuation route. The mode of smoke exhaust in the public area of the station, and mixed smoke exhaust of station public area and station tunnel, the fire smoke temperature, CO concentration and visibility in the evacuation route area are lower than the evacuation index.