主管:中华人民共和国应急管理部
主办:应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU

Fire Science and Technology ›› 2021, Vol. 40 ›› Issue (7): 1009-1012.

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Simulation study on fire pressure characteristics of mountain tunnel under chimney effect

JIANG Hao-kai1,LI Zhi-sheng1,CAI Xin2, ZHANG Yu-chun1,KONG Xiang-sui3   

  1. 1. Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Sichuan Chengdu 610031,China; 2. Shenzhen Municipal Transportation Bureau,Guangdong Shenzhen 518040,China; 3. Shenzhen Transportation Public Facilities Construction Center, Guangdong Shenzhen 518000,China
  • Online:2021-07-15 Published:2021-07-15

Abstract: In order to explore the variation characteristics of fire pressure in the shaft during mountain tunnel fire,numerical simulation method (FDS) is used to research the flow characteristics of smoke when the fire source is near the shaft or away from the shaft,and analyze fire pressure's variation law in the shaft under longitudinal ventilation. The results showed that,due to the influence of flue gas vortex,the fire pressure in the shaft shows a non-monotonic tendency,which is different from the traditional slope tunnel fire. Thus the theoretical model of tunnel fire pressure can't be used to predict the fire pressure in the shaft directly. With the longitudinal wind speed from 0 m/s to 3.5 m/s,the fire pressure in the shaft increases gradually,and the maximum difference is about 40 Pa. When the fire source is near the shaft,the fire pressure in the shaft is higher than that is away from the shaft. When there is without longitudinal wind,the maximum difference is about 25 Pa.

Key words: tunnel fire, numerical simulation, shaft, longitudinal ventilation, fire pressure