摘要
为研究高海拔公路隧道火灾工况下烟气蔓延特点和控烟风速,采用FDS火灾模拟软件对四川某高海拔单洞双向公路隧道进行了火灾三维数值模拟,分析了不同风速组合对烟气蔓延的影响,得到了该隧道火灾特性及最佳控烟风速组合。分析结果表明:1)相较低海拔公路隧道,高海拔公路隧道火灾工况下的烟气扩散速度更快,温度更高;2)当高海拔隧道内发生火灾时,横通道通风能有效抑制主洞内烟气逆流,在主洞纵向风速为3 m/s、横通道控烟风速为1 m/s时,满足抑制主洞烟气逆流和横通道无烟气蔓延的要求,故推荐该风速组合为最佳控烟风速组合。
To study the characteristics of smoke propagation and smoke control wind speed in fire conditions within high-altitude highway tunnels,the FDS fire simulation software was used to conduct a three-dimensional numerical simulation of a fire in a high-altitude,bidirectional,single-tube highway tunnel in Sichuan.The effects of different wind speed combinations on smoke propagation were analyzed,the fire characteristics and the optimal smoke control wind speed combination for this tunnel were obtained.The analysis results indicate that:1)Compared to low-altitude highway tunnels,smoke in high-altitude tunnels propagates faster and reaches higher temperatures under fire conditions;2)When a fire occurs in a high-altitude tunnel,cross-passage ventilation can effectively suppress smoke backflow in the main tunnel.When the longitudinal wind speed in the main tunnel is 3 m/s and the cross-passage smoke control wind speed is 1 m/s,the requirements for suppressing smoke backflow in the main tunnel and preventing smoke spread in the cross-passage are met.Therefore,this wind speed combination is recommended as the optimal smoke control wind speed.
作者
张梓豪
刘志强
ZHANG Zihao;LIU Zhiqiang(Lanzhou Jiaotong University,Lanzhou 730070)
出处
《公路交通技术》
2025年第3期134-143,共10页
Technology of Highway and Transport
基金
国家自然科学基金项目(41761015)。
关键词
高海拔公路隧道
隧道火灾
烟气扩散
温度分布
控烟风速
high-altitude highway tunnel
tunnel fire
smoke propagation
temperature distribution
smoking control wind speed
