活塞风作用下隧道温度场分布规律及保温效果  

Tunnel temperature field distribution rule and insulation effect under piston wind

作　　者：乔雄[1] 杨小龙 冯勇 朱小明 QIAO Xiong;YANG Xiaolong;FENG Yong;ZHU Xiaoming(School of Civil Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China;Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou,Gansu 730030,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州交通大学土木工程学院,甘肃兰州730070 [3]甘肃省交通规划勘察设计院股份有限公司,甘肃兰州730030

出　　处：《公路交通科技》2025年第2期179-187,共9页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52362050);甘肃省交通运输厅科技项目(2023-15)。

摘　　要：【目标】活塞风是影响寒区既有隧道温度场分布的重要因素,故需对活塞风不同风速时的隧道温度场分布规律及保温设计不足问题展开研究。【方法】以G212国道某隧道为依托,首先采用现场监测的方法初步得到隧道内、外温度变化规律;其次基于温度场理论及有限元法对隧道进深及关键部位的温度分布情况进行分析;而后建立活塞风、隧道进深及温度的三维曲面拟合计算式,并对有无保温措施两种情况下的温度分布情况进行比较,以验证保温层+套衬+衬砌+仰拱改造综合保温处置措施的有效性。【结果】隧道纵向温度分布总体呈抛物线型,进口段、出口段及各断面温度分布呈三角函数型,隧道各断面温度分布总体呈现拱脚<拱腰<拱顶<仰拱底<边墙底的规律;隧道拱脚位置温度在活塞风作用下随冻深及隧道进深呈指数型分布;洞口段隧道整体温度变化幅度较大,随着隧道进深的增加整体温度变化幅度逐渐减小,洞内温度随风速的降低整体呈线性下降趋势;数值模拟结果表明,即使在最不利条件下,采用保温层+套衬+衬砌+仰拱改造综合处置措施效果较好,隧道各关键部位均为正温。【结论】研究结果对隧道结构和行车安全具有重要意义,可为长期服役的寒区既有隧道冻害防治提供参考。[Objective]The piston wind is a significant factor influencing the temperature field distribution in existing tunnels located in the cold regions.Consequently,it is essential to investigate the tunnel temperature field distribution rules with various piston wind speeds,as well as to address the issues related to inadequate thermal insulation design.[Method]Taking a tunnel on G212 national highway for example,the temperature variations inside and outside the tunnel were determined through the field monitoring.Subsequently,utilizing temperature field theory and the finite element method,the temperature distribution at various tunnel depths and at key locations was analyzed. A 3D fitting calculation formula was developed torelate the piston wind, tunnel depth, and temperature. The temperature distributions under two scenarios,with and without thermal insulation measures, were compared to assess the comprehensive thermal insulationtreatment effectiveness, including thermal insulation layer, liner, lining, and inverted arch transformation.[Result] The longitudinal temperature distribution inside tunnel typically follows a parabolic pattern. Thetemperature distribution at the inlet and outlet sections, as well as each cross section, can be described bythe trigonometric functions. Generally, the temperature distribution across the tunnel sections adheres to thehierarchy as arch foot < arch waist < vault < inverted arch bottom < side wall bottom. The temperature attunnel arch foot exhibits an exponential relation with both the freezing depth and tunnel depth influenced by thepiston wind effect. At the tunnel entrance section, there is a significant overall temperature variation. As thetunnel depth increasing, this variation gradually diminishes, and the temperature within the tunnel decreaseslinearly in response to a reduction of wind speed. The numerical simulation result indicates that even under themost adverse conditions, the comprehensive treatment measure of thermal insulation layer, liner, lining, andinverted arch

关 键 词：隧道工程 温度场 数值模拟 活塞风 处置措施 

分 类 号：U457.2[建筑科学—桥梁与隧道工程]