Journal of South China University of Technology (Natural Science Edition) ›› 2014, Vol. 42 ›› Issue (6): 121-128.doi: 10.3969/j.issn.1000-565X.2014.06.019

• Architecture & Civil Engineering • Previous Articles     Next Articles

Smoke Backlayering Length and Critical Wind Velocity in a Metro Tunnel

Weng Miao- cheng1 Yu Long- xing1 Liu Fang1，2   

  1. 1.Faculty of Urban Construction and Environmental Engineering,Chongqing University,Chongqing 400045,China;2.Key Laboratory of the Three Gorges Reservoir Region’ s Eco- Environment of the Ministry of Education∥National Centrefor International Research of Low- Carbon and Green Buildings,Chongqing University,Chongqing 400045,China
  • Received:2013-08-21 Revised:2014-02-10 Online:2014-06-25 Published:2014-05-01
  • Contact: 刘方(1965-)，女，教授，博士生导师，主要从事建筑防火技术研究． E-mail:drliufang@126.com
  • About author:翁庙成(1981-)，男，博士生，主要从事建筑防火技术研究．E-mail:jandyki@gmail．com
  • Supported by:

    重庆市科委自然科学基金资助项目(CSTC， 2009BB6193);公安部重点研究计划项目(2011ZDYJCQXF019);重庆大学中央高校基本科研业务费专项资金资助项目(CDJXS11210003);高等学校学科创新引智计划项目(B13041)

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Abstract:

In this paper,first,the dimensionless expressions of the smoke backlayering length and the criticalvelocity in metro tunnels were deduced via a dimensional analysis.Then,nine tunnels with different cross sectionswere employed according to the survey results from the tunnel form of the Metro Line 6 in Chongqing,China,andthe smoke flow in the tunnels was analyzed with FDS5.5.Finally,the prediction models of the smoke backlayeringlength and the critical velocity were established,and a 1/10 scale model tunnel was built to carry on small- scalemodel experiments.The results show that the results obtained by the proposed prediction models accord well withthose of small- scale model experiments,and that the critical velocity predicted by the existing method is underesti-mated.

Key words: metro tunnel fire, smoke backlayering length, critical wind velocity, dimensionless analysis method, small- scale model experiment

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