非对称人字坡隧道火灾纵向通风临界风速的试验研究  

Experimental study on critical ventilation speed in asymmetric herringbone tunnel fire

作　　者：郭志成 李俊梅[1,2] 欧阳力 李炎锋[1,2] Guo Zhicheng;Li Junmei;Ouyang Li;Li Yanfeng(Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology,Beijing University of Technology,Beijing 100124,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学绿色建筑环境与节能技术北京市重点实验室,北京100124 [2]北京工业大学城市建设学部,北京100124

出　　处：《消防科学与技术》2024年第9期1253-1258,共6页Fire Science and Technology

基　　金：北京市自然科学基金资助项目(8222002)。

摘　　要：人字坡隧道较多地出现在山岭隧道和新建的城市交通隧道中,火灾时其内部烟气流动复杂,纵向通风时,对烟气实施有效控制困难。通过搭建1:20的人字坡隧道模型试验台,对火源位于变坡点时,非对称人字坡隧道内不同的坡度组成和不同火源功率作用下的临界风速进行了研究。研究结果表明:在小坡度侧实施纵向通风时,临界风速大于同一断面和火源功率作用下平直隧道内的临界风速,且临界风速随变坡点两侧坡度差的增加而增大;在大坡度侧施加纵向通风时,临界风速小于平直隧道内的临界风速,且临界风速随着坡度差的增大而减小。为了便于工程应用,综合模型试验结果,对平直隧道的临界风速模型进行了坡度修正,得到了可用于人字坡隧道的临界风速修正系数。Herringbone tunnels are often found in mountain tun-nels and new-built urban traffic tunnels.The smoke flow is com-plicated in case of fire and controlling the smoke effectively with longitudinal ventilation is relatively difficult.By setting up a 1:20 herringbone tunnel model test rig,the critical ventilation speed un-der different slope composition and different fire power in asym-metric herringbone tunnel was studied.The results show that when the longitudinal ventilation flows from the small slope side to the large slop side,the critical ventilation speed is greater than that in the normal tunnel with the same tunnel cross-section and same fire power.The critical ventilation speed increases with the increase of the slope difference on both sides of the variable slope point.When longitudinal ventilation flow from large slope side,the critical ventilation speed is less than that in the normal tunnel,and the critical ventilation speed decreases with the increase of the slope difference.For the engineering application,the slope correc-tion of the critical ventilation speed model of the normal tunnel is carried out based on the experimental results,and the correction coefficient of the critical ventilation speed is obtained.

关 键 词：人字坡隧道 纵向通风 临界风速 模型试验 

分 类 号：X913.4[环境科学与工程—安全科学] TU998.1[建筑科学—市政工程]