碳氢曲线下大直径盾构隧道结构热力特性  

Thermal characteristics of a lining of a large diameter shield tunnel under hydrocarbon curve

作　　者：闫治国[1,2] 王紫锐 沈奕[1,2] 刘康 YAN Zhiguo;WANG Zirui;SHEN Yi;LIU Kang(Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院地下建筑与工程系,上海200092 [2]同济大学土木工程防灾减灾全国重点实验室,上海200092

出　　处：《隧道与地下工程灾害防治》2024年第2期25-36,共12页Hazard Control in Tunnelling and Underground Engineering

基　　金：国家自然科学基金资助项目(52208401)

摘　　要：以济南某大直径隧道为研究对象,研究盾构隧道在火灾作用下温度场分布、结构变形以及内力分布规律,建立盾构隧道的全尺寸数值分析模型,提出盾构隧道衬砌结构的热-力耦合分析方法。研究结果表明:火灾作用下,内表面受火区域的温度明显高于外表面,衬砌在距离内表面300 mm的部分基本不受火灾影响;衬砌结构受热发生膨胀变形,拱顶和拱底的变形逐渐降低,拱腰的水平方向变形不断增加,且部分管片接头明显张开;衬砌逐渐从受火面开始进入屈服状态,混凝土出现了应力重分布现象,连接处螺栓在高温作用下发生局部屈服;衬砌结构整体轴力下降并且弯矩剧烈增大,拱腰位置的弯矩比火灾前增大近一倍。Based on a large-diameter tunnel in Jinan,a full-scale numerical analyze model was performed to analyze the temperature field distribution,structural deformation and internal force distribution of the shield tunnel in fire.A thermal-mechanical coupling analysis method for shield tunnel lining structures was proposed.The results showed that the temperature of the inner heating surface area was significantly higher than the outer surface during fire,300 mm part of the lining from the inner heating surface was not affected by fire;The lining expanded due to the heating in fire;The deformation of the vault and the bottom gradually decreased,the horizontal deformation of the arch waist continued to increase,some segment joints were significantly opened under the effect of fire.The stress of lining entered the yield state from the heating surface,while stress redistribution developed and connection bolts partially yield;The axial force of overall structure decreased and the bending moment increased dramatically,the bending moment of the arch waist even doubled compared with before.

关 键 词：盾构隧道 数值模拟 火灾 热力耦合 力学特性 

分 类 号：U43[交通运输工程—道路与铁道工程]