东南大学学报（自然科学版）2025，Vol.55Issue(3)：856-863,8.DOI:10.3969/j.issn.1001-0505.2025.03.028
基于瞬态热应变的隧道火灾高温衬砌结构变形机理研究
Research on the mechanism of deformation of tunnel lining structure exposed to fire based on transient thermal strain
摘要
Abstract
To investigate the mechanism of transient thermal strain on lining deformation under high tempera-ture of tunnel fire,a transient thermal strain model is developed based on ABAQUS,and numerical simulation is used to study and analyze the deformation law of lining structure under high temperature of fire.The effect of transient thermal strain on the deformation of tunnel lining is further considered.The results show that the model calculation results in this paper are in good agreement with the test.The transient thermal strain can re-duce the deformation at the region of arch top,arch shoulder,and side wall,and the maximum reduction ratio is 13.4%,10.1%,and 3.1%,respectively.Moreover,the difference in deformation between considering and not considering transient thermal strain exists in three development stages,namely rapid growth,second-ary growth,and decline stages.The dominant factors in the first two stages are high heating rate and transient thermal strain at deeper depths,while the main influencing factors in the descending section of the sidewall are circumferential and longitudinal transient thermal strain.At different burial depths,the deformation at the arch crown and arch shoulder increases with increasing burial depth,while the deformation at the side wall de-creases with increasing burial depth in the later stage of fire.关键词
隧道工程/结构抗火/瞬态热应变/变形规律/热力耦合/二次开发Key words
tunnel engineering/structural fire resistance/transient thermal strain/deformation pattern/thermo-mechanical coupling/secondary development分类
交通工程引用本文复制引用
王峰,曾锦屏,方亚彪,陈训..基于瞬态热应变的隧道火灾高温衬砌结构变形机理研究[J].东南大学学报（自然科学版）,2025,55(3):856-863,8.基金项目
国家自然科学基金资助项目(52078429). （52078429）
