坡度对铁路隧道火灾影响的机理分析  

Comments on the gradient's impact mechanism during a railway tunnel fire

作　　者：赵望达[1] 李洪[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《长沙交通学院学报》2009年第1期53-57,共5页Journal of Changsha Communications University

基　　金：铁道部科技研究开发计划项目(2006G007-C-1)

摘　　要：以狮子洋隧道为背景,对隧道火灾因坡度引起的影响进行了数值模拟,分析了火灾时隧道内的温度、能见度及烟气蔓延特征,结果显示:隧道坡度对烟气蔓延的影响随坡度的增大而增大,并且存在着一个临界突变值.得出了烟气蔓延到最大又回流的一段长度,是由于隧道内、外的温度差产生烟囱效应的结果.并对临界风速公式中坡度对临界风速的影响系数提出了修正.为研究隧道火灾及制定火灾情况下人员疏散方案提供参考.Tunnel fire caused by the impact of tunnel s gradient was numerically simulated,taking Shiziyang tunnel for an example,and the temperature,visibility and characteristics of the spread of smoke in the tunnel was analyzed when fire happened,the result shows that the sharper the gradient of tunnel is,the greater impact the spread of smoke will become,and there is a critical value of the mutation.The length caused by smoke came back and spread to the largest section as a result of internal and external temperat...

关 键 词：隧道 坡度 火灾 数值模拟 

分 类 号：U459.1[建筑科学—桥梁与隧道工程]