顶隔板对公路隧道火灾烟气蔓延及温度的影响研究  

The influence of roof spacer on the smoke spread and temperature in highway tunnel fire

作　　者：周湘川[1] 赵望达[1] 倪天晓[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2011年第1期77-81,共5页Journal of Railway Science and Engineering

基　　金：浙江省科技计划项目"重大科技专项"(2008C13041-2)

摘　　要：以隧道独立排烟道集中排烟模式为研究背景,对不同坡度下有无顶隔板的12组火灾工况进行数值模拟,分析顶隔板对隧道火灾烟气蔓延与温度分布的影响。结果表明:顶隔板使隧道在火灾情况下产生明显烟囱效应的临界坡度变为1%,同时隧道顶部的最高温度比原来至少提高了10%,隧道内600℃以上的高温烟气分布范围比无顶隔板情况多出6 m以上、800℃以上的高温烟气分布范围多出4 m以上,火灾对隧道的结构影响更大。为独立排烟道隧道的防火设计和结构保护提供参考依据。The research background is the centralized smoke extraction mode of the tunnel independence smoke extraction passage in this paper.Twelve groups of fire situation under different slopes in the tunnel with roof spacer or without roof spacer were simulated,and the influence of the roof spacer on the smoke spread and temperature distribution was analyzed.It is proved that the roof spacer can make the tunnel produce the evident chimney effect in fire and the critical slope gradient is 1%.At the same time,the highest temperature on the top of the tunnel increases by 10% at least.The distribution range of the high temperature smoke in the tunnel with roof spacer is wider than that in the tunnel without roof spacer.The high temperature region over 600 ℃ is more than 6m and that over 800 ℃ is more than 4 m.All the above results provide some references to the design of fire protection and structure protection to the independence smoke extraction passage in the tunnel.

关 键 词：顶隔板 隧道火灾 烟气蔓延 温度 

分 类 号：U458[建筑科学—桥梁与隧道工程]