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隧道火灾的危害不仅仅表现在高温、浓烟对人身安全造成的伤害,而且表现在隧道衬砌结构的破损以及倒塌。基于前人对混凝土温度损伤形式的总结,利用数值分析手段对高温火灾下的隧道进行分析研究,用定量分析的方法得出衬砌结构混凝土的破坏形态。研究结果表明:火灾会导致大部分衬砌应力值降低;火灾会对衬砌表面距受火中心6m范围内及隧道顶部衬砌内部0.4 m范围内有较大影响;隧道顶部衬砌表面混凝土较容易发生片状劈裂,内部混凝土较易发生斜剪破坏,为隧道防火设计提供参考。
Tunnel fire harm not only in high temperature, smoke on the personal safety damage, but also in the tunnel lining structure damage and collapse. Based on the previous summary of the forms of concrete temperature damage, numerical analysis is used to analyze the tunnel under high temperature fire and the failure morphology of concrete lining is obtained by quantitative analysis. The results show that: the fire will lead to the reduction of most of the lining stress; the fire will have a significant impact on the lining surface within 6m from the fire center and 0.4m inside the lining of the top of the tunnel; the lining concrete on the top of the tunnel is more likely to flake Splitting, internal concrete is more prone to oblique shear damage, provide a reference for the fire protection design of the tunnel.