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《Journal of Highway and Transportation Research and Development》 2008-06
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Analysis on the "Chimney Effect" and Smoke Extraction Countermeasures for Fire in Cangling Tunnel

WU De-xing~(1,2) WANG Bo~3 ZHENG Guo-ping~2 (1.Department of Underground Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China; 2.Zhejiang Provicial Plan Design & ResearchInstitute of Communications,Hangzhou Zhejiang 310006,China; 3.Zhejiang Highway and Water Transportation Engineering Consulting Corpration,Hangzhou Zhejiang 310005,China)  
Through summarizing the research actuality of"chimney effect"in mountain tunnel,the"chimney effect"caused by the difference in altitude and temperature in Cangling super long highway tunnel and smoke extraction countermeasures were analyzed by numerical analysis.The research indicates that"chimney effect"is obvious in Cangling tunnel:when the ventilation is longitudinal and the traffic is one-way,"chimney effect"can bring advantage to the right tunnel and disadvantage to the left and exit of right;when the traffic is two-way, disadvantage of"chimney effect"can be brought in whole tunnel:while the disadvantage of it is out of control,it would lead to latent danger in fire.Independent smoke extraction passages at the top of secondary lining can effectually control the influence of"chimney effect"and the danger can be greatly reduced.
【CateGory Index】: U453
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