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| Reasonable smoke exhaust strategy of highway tunnel with a parallel pilot tube |
| GUO Hongyu, TIAN Wei, LIU Jia
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| 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.
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Received: 12 April 2021
Published: 20 June 2021
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