隧道火灾衬砌混凝土破坏形态的数值分析  

Study on Numerical Analysis of Failure Mode of Tunnel Lining Concrete under Fire

作　　者：熊珍珍[1,2] 宋宏伟[1,2] 敖芃[1,2] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《地下空间与工程学报》2013年第S2期2014-2018,共5页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(50978251)

摘　　要：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。Harm of tunnel fire not only resulted in harm of high temperature and smoke to personal safety,but also in the breakage and collapse of tunnel lining structure. Based on the summary of concrete damage form in high temperature,we use a numerical analysis way to analyze the tunnel under fire,then use the method of quantitative analysis to get the failure mode of lining concrete. The research results show that: the fire will cause decrease of most of lining stress; fire has a great influence on the lining surface in range of 6 m apart from the fire center and in range of 0. 4 m inside the roof of the tunnel lining; the surface of the tunnel lining concrete on the roof is prone to flake splitting,and the concrete inside the tunnel lining is easy for diagonal shear failure,this provides reference for design of tunnel fire.

关 键 词：高温 衬砌 破坏形态 数值分析 

分 类 号：U454[建筑科学—桥梁与隧道工程]