中文摘要：

根据多层地铁结构特点,提出在站台楼梯口处设置空气幕来阻烟,且以多层地铁车站为研究对象,选用计算流体力学软件FDS,建立地铁车站三维模型,模拟研究了站台火灾时基于防烟空气幕的不同防排烟模式,通过模拟研究得出如下结论：当地下3层站台火灾且通向上一层站台的楼梯口处防火卷帘失效时,站台排烟和防烟空气幕联合作用不仅可以有效把烟气控制在火灾层,对整个火灾层的烟气扰动小,可以保证人员6min以上的安全疏散时间,且由于防烟空气幕的柔性阻隔作用,有利于人员疏散和消防救援.

英文摘要：

Referring to the architecture characteristics of the multilayer metro station, smoke-preventing air curtains are proposed to be used at the exit of staircase in the platform to prevent smoke. Taking a multi- layer metro station as the main research object, the computational fluid dynamics software FDS is used to build a 3D model of metro station. The different smoke control modes are studied when platform caught a fire and the smoke-preventing air curtain is used. The comparative analysis of the simulation shows that.. when the fire is on the third underground floor while fire shutters at the gate of stair to the upper platform fail to work. The platform exhaust smoke system combined with smoke-preventing air curtain can effec- tively keep the smoke in the fire floor with little disturbance on smoke layer; and it is good for the evacua- tion of people and fire rescue because of its soft preventing effect.