摘要
为研究火灾初期时大断面道路隧道内温度及烟气流动特性,在三车道大断面试验隧道内进行了足尺火灾试验。试验考虑了0.5 MW、1 MW及5 MW三个等级的火灾规模;试验纵向风速范围为0-2 m/s。试验结果表明：在火灾发展初期,火灾规模和纵向风速是影响大断面道路隧道内温度场分布及烟气扩散的重要因素;隧道火灾产生的高温烟气趋于向拱顶扩散,故隧道横截面高温区域分布于隧道上部空间,靠近地面的空间温度则较低。火灾规模越大,隧道横截面的高温区域范围越大。大断面隧道因隧道内空间较大,有利于烟气扩散和人员逃生。然而,火灾预警的角度考虑,大断面隧道需多在关键截面上设置温度传感器和摄像头,以获得更为有效的火情信息来组织灵活的疏散逃生方案。
In order to observe the smoke behavior during the initial stage of fire in a large cross-section road tunnel,the full-scale experiment study was taken in the three-lane test tunnel. Three tests differed in air velocities（ 0 - 2m/s） and fire scales（ 0. 5MW,1MW,5MW）. Results indicated that,during the initial stage of fire in large cross-section road tunnel,the fire scales and air velocities are important factors,which affect the temperature field and smoke diffusion. The hot smoke from the fire in tunnel tends to diffuse to the vault. Therefore,the high temperature region occupied the upper space of the tunnel,while the temperature of lower part was lower. Larger inner space of large cross-section road tunnel is conductive for fire smoke spreading. The larger the fire scale was,the more broad the high temperature region expanded. However,for the fire alarm consideration,more thermal sensors and cameras need to be set up around the key sections of the large cross-section tunnel. Based on these effective scenario information,flexible evacuation plan will be applied in tunnel fire situation.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第4期1080-1087,共8页
Chinese Journal of Underground Space and Engineering
基金
上海市科技重点支撑项目(13231200601)
交通运输部建设科技项目(2013318J02120)
土木工程防灾国家重点实验室自主课题
关键词
道路隧道
大断面
足尺试验
火灾烟气
road tunnel
large cross-section
full-scale experiment
fire smoke
