双向互为逃生通道的地铁区间隧道通风排烟方式实验研究

为验证发生事故隧道纵向通风、非事故隧道正压送风的气流防烟模式的有效性,通过以类矩形地铁区间隧道为原型,建立了1：3的实体试验平台,对两种纵向通风模式的防烟效果、非事故隧道沿程温度及联络通道口温度变化对比分析。结果表明：事故隧道纵向通风、非事故隧道正压送风这种有效的气流防烟方法既可在无空间设置防火门的地铁区间隧道得以应用,也可以作为常规地铁区间隧道防火门损坏后降低火灾危害的应急手段。可见在有效的正压送风模式下,事故隧道纵向通风临界风速为1.6m/s,1#A联络通道口临界风速为1.7m/s,1#B联络通道口临界风速为1.8m/s,该参数可以为地铁区间隧道风机提供选型依据。

Experimental Study on ventilation and smoke exhaust mode of metro tunnel with two-way mutual escape way

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.