沉管隧道火灾烟气蔓延特性

发布时间：2018-06-29 23:10

本文选题：隧道工程 + 沉管隧道火灾　；参考：《长安大学学报(自然科学版)》2014年06期

【摘要】：为了深入了解沉管隧道火灾过程中烟气的蔓延规律,通过理论推导与足尺试验验证相结合的方法,建立烟气流动的数学模型,推导出烟气层温度及流速沿隧道纵向衰减的理论模型。在此基础上,以港珠澳沉管隧道为研究对象,建立1∶1足尺沉管试验隧道,配备完善的机电系统与测量系统,开展隧道火灾试验,对不同火灾热释放速率和纵向风条件下的烟气层平均温度与平均流速的预测模型进行验证。研究结果表明:在忽略烟气层对下层冷空气的卷吸作用时,烟气温度沿隧道纵向呈指数衰减;同时,烟气蔓延速度的衰减与温度衰减成正比,沿隧道纵向也呈指数衰减。最终给出港珠澳大桥海底沉管隧道火灾工况下烟气运动的预测模型。
[Abstract]:In order to understand the law of smoke spread in the course of tunnel fire, a mathematical model of flue gas flow is established by combining theoretical derivation with full-scale test. The theoretical model of the attenuation of flue gas layer temperature and velocity along the tunnel longitudinal direction is derived. On this basis, taking the Hong Kong-Zhuhai-Macao immersed tube tunnel as the research object, the 1:1 full-scale immersed tube test tunnel was established, which was equipped with a complete mechanical and electrical system and a measuring system to carry out the tunnel fire test. The prediction model of average temperature and average velocity of flue gas under different fire heat release rate and longitudinal wind was verified. The results show that the smoke temperature attenuates exponentially along the tunnel longitudinally, and the attenuation of flue gas propagation velocity is proportional to the temperature attenuation and exponential attenuation along the tunnel longitudinal, while neglecting the entrainment effect of the flue gas layer on the lower layer of cold air. Finally, the prediction model of smoke movement under fire condition of undersea immersed tunnel of Zhuhai-Macao Bridge is given.
【作者单位】：重庆交通大学土木建筑学院;招商局重庆交通科研设计院有限公司;
【基金】：国家科技支撑计划项目(2011BAG07B05)
【分类号】：U458

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