Hazard Control in Tunnelling and Underground Engineering  2021, Vol. 3 Issue (2): 69-76    DOI: 10.19952/j.cnki.2096-5052.2021.02.08
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Reasonable smoke exhaust strategy of highway tunnel with a parallel pilot tube
GUO Hongyu, TIAN Wei, LIU Jia
Zhejiang Institute of Communications, Co., Ltd., Hangzhou 310030, Zhejiang, China
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Abstract  Three normally-adopted schemes highway tunnel with a parallel pilot tube were taken to formulate their corresponding smoke spreading in the main tunnel and pilot tube by using the fire simulation software FDS to establish a local tunnel model. The analysis results showed that: soon after the fire was confirmed, jet fans should be turned off to induce the smoke spread freely to both sides. As a result, the stratification phenomenon(smoke gathered in the tunnel vault)caused by the buoyancy of the smoke could facilitate the escape and evacuation of occupants on both sides of 2.5 m above road surface. Until all the occupants had evacuated to the pilot tube, then the air flow with critical air velocity should be yielded to drive the smoke to one side. It was suggested that the direction of smoke exhaust should be consistent with the normal operation ventilation direction. The research conclusions is conducive to compiling fire emergency plan of similar projects.
Key wordshighway tunnel      bidirectional traffic      parallel pilot tube      smoke exhaust      numerical simulation     
Received: 12 April 2021      Published: 20 June 2021
ZTFLH:  U458.1  
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GUO Hongyu
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GUO Hongyu,TIAN Wei,LIU Jia. Reasonable smoke exhaust strategy of highway tunnel with a parallel pilot tube[J]. Hazard Control in Tunnelling and Underground Engineering, 2021, 3(2): 69-76.
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http://tunnel.sdujournals.com/EN/10.19952/j.cnki.2096-5052.2021.02.08     OR     http://tunnel.sdujournals.com/EN/Y2021/V3/I2/69
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