Study on Smoke Characteristics of Longitudinal Ventilation for Fires in Very Long Highway Tunnels
At present,the research on longitudinal ventilation for fire in road tunnels mainly focuses on medium and short tunnels,and there are fewer research results on super-long tunnels of more than 5 km,and there is a lack of corresponding specific design guidelines.In this paper,relying on the actual project-Daxingxiang Tunnel,for a typical fire scenario(30MW),a numerical calculation model of the full longitudinal ventilation of long tunnels with fire is established,and the smoke characteristics of the full longitudinal ventilation of long tunnels with fire are investigated.The results show that the smoke from a super-long tunnel fire basically reaches a uniform distribution beyond 1300m downstream of the fire source,i.e.,the smoke concentration beyond 1300m downstream no longer varies with the spreading distance;the increase of the ventilation speed helps the decrease of the smoke concentration in the tunnel;and the smoke from a fire in a super-long tunnel meets the safety control standards under the three wind speed scenarios studied in this report.
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维普
