火灾高温下隧道衬砌混凝土爆裂及力学行为研究

项目名称： 火灾高温下隧道衬砌混凝土爆裂及力学行为研究

项目编号： No.51208105

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 陶津

作者单位： 东南大学

项目金额： 25万元

中文摘要： 隧道结构的火灾安全性是其安全性能研究的重要课题，而衬砌材料混凝土高温力学性能的建立是进行隧道结构火灾安全分析的基础。 本项目拟通过火灾高温下隧道衬砌混凝土（自密实混凝土）的爆裂试验，探讨隧道结构混凝土的爆裂控制措施，并且结合混凝土微观结构的损伤演化过程，定量的评价隧道结构混凝土的高温爆裂机率，建立混凝土的高温爆裂模型；进而基于通过混凝土高温变形试验得到的瞬态应变、短期高温徐变、应力产生的即时应变等高温应变，以及损伤力学理论和混凝土微观结构的演化模型，构建能够考虑高温下混凝土微观结构演变的热-力-化学耦合效应的多尺度变形模型；在此基础上，通过理论分析和数值模拟，对上述模型进行验证。 项目研究旨在更为精细的描述隧道衬砌混凝土高温爆裂及力学性能的损伤规律，为探明隧道结构高温行为的演化特征和分析混凝土结构的高温性能提供依据和基础。

中文关键词： 火灾高温；爆裂；隧道衬砌混凝土；高温变形；多尺度

英文摘要： The safety of tunnel exposed to fire is one of the key problems of tunnel safety. And the mechanical properties of concrete for tunnel lining at high temperatures provide a basis for the study of safety for tunnel in fire. Firstly, the spalling protection will be investigated by the spalling test of concrete (self-compacting concrete) for tunnel lining at high temperatures in this study. The occurrence probability of spalling will be evaluated quantitatively and the model of spalling will be established based on the damage process of microstructure of concrete at high temperatures. Secondly, the deformation properties of self-compacting concrete will be investigated by tests, such as transient strain, short-term creep strain at high temperatures and instantaneous stress-related strain. Thirdly, the multiscale chemo-thermo-mechanical coupling models for thermal strain and elastic modulus of self-compacting concrete under high temperatures will be established based on the damage mechanics theory and the evolution of microstructure of self-compacting concrete. Finally, the numerical simulation and theory analysis of tunnel linning will be done in order to verify the above multiscale chemo-thermo-mechanical coupling model of thermal strain. The spalling and mechanical properties of concrete for tunnel lining at hi

英文关键词： fire and high temperature；spalling；concrete for tunnel lining；deformation at high temperature；multiscale