Discussion on the Most Unfavorable Fire Scale in Urban Multi Lane Tunnels
Based on the Longquanshan No.1 Tunnel,the lateral ignition time of vehicles is calculated using the critical radiation heat flux theory.Based on early experimental results obtained in literature,a single vehicle heat release rate curve is established for the tunnel.Considering the lateral development of the fire,the most unfavorable fire scale in typical fire scenarios in urban multi lane tunnels is studied by coupling the tunnel multi lane fire scenario with the single vehicle heat release rate curve.The results indicate that the most unfavorable fire scale in a tunnel can reach the sum of the maximum fire scale of participating vehicles,and the development and changes of fires in each scenario are consistent.As the horizontal spread of fires increases,the combustion time for tunnel fires to maintain maximum scale continuously decreases.When designing the most unfavorable fire scale in a tunnel,dynamic design should be carried out.
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