摘要
区间隧道火灾时的温度场分布是保障隧道结构安全与制定人员疏散方案的重要依据。根据市域快线列车车厢内部不同因素引发火灾的常见位置,通过数值模拟的方法研究市域快线列车内部不同位置火灾对隧道温度场分布的影响。研究结果表明:1)在1~3 MW火灾中,行李火灾、人为纵火常见位置对隧道拱顶温度影响较大;在4~5 MW火灾中,设备火灾常见位置对隧道拱顶温度影响较大。隧道拱顶的高温区出现在火灾车厢某个客室侧门上方。2)隧道拱顶最高点处温度峰值的最大值常出现在车厢端部客室侧门处。在火灾车厢范围外,隧道拱顶最高点处温度呈指数衰减,且纵向轴线上的火源越靠近车厢中心,隧道拱顶最高点处温度衰减越慢。3)当火源位于车厢内,疏散平台上方的拱顶温度受影响范围较小、峰值较高,当火源位于贯通道内其受影响范围较大、峰值较低,且每个客室侧门处均形成了峰值。4)市域快线列车内部火灾会对3~4节车厢范围内的疏散平台2 m高处温度产生显著影响,在此范围内客室侧门正对的位置形成峰值。当火源功率达到3 MW时,疏散平台开始出现危险区域;当火源功率达到4 MW以上,不同火灾位置时疏散平台均会出现危险区域。行李火灾、人为纵火常见位置的火灾场景更不利于人员疏散。研究成果可为隧道结构安全设计与人员疏散方案的制定提供理论支撑。
The distribution of the temperature field during a fire in an interval tunnel is an important basis for ensuring the safety of the tunnel structure and formulating evacuation plans.According to the common locations of fires caused by different factors inside the metropolitan rapid rail transit vehicle,the influence of fires on the distribution of the temperature field in the tunnel was studied by means of numerical simulation.The results are drawn.1)In the 1~3 MW fire,the common locations of luggage fire and arson have a greater impact on the temperature of the tunnel ceiling;in the 4~5 MW fire,the common locations of the equipment fire have a greater impact on the temperature of the tunnel ceiling.The high temperature area of the tunnel ceiling appeared above one of the side doors of the compartment in fire.2)The maximum value of the temperature peak at the highest point of the tunnel ceiling tends to appear at the side doors at the ends of the compartment.Outside the range of the tunnel ceiling corresponding to the compartment in fire,the temperature at the highest point of the tunnel ceiling decays exponentially,and the closer the fire source on the longitudinal axis is to the center of the compartment,the slower the temperature decays at the highest point of the tunnel ceiling.3)When the fire source is located in the passenger compartment,the temperature variation range of the ceiling above the evacuation platform is small and the peak value is high.When the fire source is located in the gangway,the temperature variation range is large and the peak value is low.4)The fire inside the metropolitan rapid rail transit vehicle will have a significant impact on the temperature at a height of 2 m above the evacuation platform within the range of 3~4 carriages.Within this range,a temperature peak is formed at the position where the compartment side doors are directly opposite.The farther the fire source is from the center of the compartment,the higher the peak is.When the fire source power reaches 3 MW,the evacuation
作者
徐志胜
王悦琳
赵家明
谢宝超
何冠鸿
杨洋
XU Zhisheng;WANG Yuelin;ZHAO Jiaming;XIE Baochao;HE Guanhong;YANG Yang(School of Civil Engineering,Central South University,Changsha 410075,China;Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;Changsha Rail Transit Group Co.,Ltd.,Changsha 410019,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2023年第9期3476-3487,共12页
Journal of Railway Science and Engineering
基金
国家重点研发计划资助项目(2017YFB1201204)。
关键词
市域快线
隧道拱顶
疏散平台
火灾位置
温度场
metropolitan rapid rail transit vehicle
tunnel ceiling
evacuation platform
fire location
temperature field
