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《Journal of Guangzhou University(Natural Science Edition)》 2006-02
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Numerical studies on the critical velocity and smoke distribution affected by tunnel cross-section geometry in tunnel fire

ZHOU Xiao-qing,ZHAO Xiang-xiang,DING Yun-fei,ZHENG Zhi-min(Institute of Building Environment and Service,Guangzhou University,Guangzhou 510006,China)  
Three different cross-sectional geometry tunnels in actual project(single-track shield tunnel,single-span rectangular tunnel and double-span rectangular tunnel) which have the same heights and maximal widths affecting the critical velocity are simulated and analyzed.The results show that the single-track shield cross-sections have the maximal critical velocity and the double-span rectangular cross-sections have the minimal critical velocity of the three tunnels.The corrections of longitudinal ventilation with backing up distances are obtained.The critical velocities are computed of the three tunnels from the corrections.The temperature and smoke distributions affected by tunnel geometry are simulated and analyzed at the computed critical velocity,which validates the veracity of the obtained corrections.The results can provide theory instructions for subway tunnel smoke control and the design of longitudinal ventilation systems.
【Fund】: 国家自然科学基金资助项目(50378022)
【CateGory Index】: U452.2
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