考虑日周期波动的寒区隧道温度场分布规律研究  

Analysis of tunnel temperature distribution in cold regions accounting for daily temperature fluctuations

作　　者：许鹏 刘平飞 伍毅敏[2] 张涛 XU Peng;LIU Pingfei;WU Yimin;ZHANG Tao(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;School of Civil Engineering,Central South University,Changsha 410075,China;China Railway Harbin Group,Harbin 150006,China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750021 [2]中南大学土木工程学院,长沙410075 [3]中国铁路哈尔滨局集团有限公司,哈尔滨150006

出　　处：《安全与环境学报》2024年第9期3458-3466,共9页Journal of Safety and Environment

基　　金：国家自然科学基金项目(52368056);中国铁路总公司科技研究开发计划项目(K2018G019)。

摘　　要：寒区隧道常受到冻害问题困扰,隧道温度场分布规律是研究冻害产生机制及抗冻设防的基础。基于乌鞘岭1号隧道温度场监测结果发现的日周期波动特征,建立了考虑该特征的隧道纵向温度场解析计算模型和横断面数值模拟模型,分析了洞内风速对隧道纵向温度场分布规律的影响,探究了日周期波动特征在横断面的分布规律。研究结果表明:隧道纵向温度包络线呈喇叭状,开口尺寸为洞口日温度波动幅度,随着距隧道进口距离的增加,温度波动的幅度逐渐减小;随隧道内风速越小,隧道内温度波动幅度衰减速率越快,隧道纵向温度场解析结果与相同条件下的实测结果差异不大;沿隧道径向,温度的日周波动幅度随距衬砌表面距离的增加而减小,隧道二次衬砌不同径向深度处经历的冻融循环次数不同呈现同样规律。By employing the self-developed intelligent temperature logger,the temperature at various coordinates within the tunnel was monitored.The analysis focused on the cooling and coldest seasons to investigate the distribution pattern of the tunnel temperature field.By examining the daily cycle fluctuation characteristics of the temperature field in the Usshering No.1 Tunnel,an analytical computational model for the longitudinal temperature field of the tunnel was developed.This model integrates the observed features,along with a numerical simulation model for the cross-section of the tunnel.A numerical simulation was conducted using ANSYS software to examine the temperature field of the tunnel cross-section under daily cycle temperature fluctuations and to identify the associated daily cycle fluctuation characteristics.These models were utilized to assess how cave wind speed,daily temperature cycles at the tunnel entrance,and distance from the tunnel inlet influence the distribution pattern of the tunnel's longitudinal temperature field.Furthermore,an analysis was conducted to explore the distribution of daily cycle fluctuation characteristics across the tunnel's cross-section.The results revealed that the longitudinal temperature envelope of the tunnel takes on a trumpet-like shape,where the size of the opening correlates with the amplitude of daily temperature fluctuations at the tunnel entrance.The amplitude diminishes gradually with increasing distance from the tunnel inlet.Moreover,a more rapid decline in temperature fluctuation amplitude is observed as the wind speed within the tunnel decreases.The analytical outcomes for the tunnel's longitudinal temperature field are consistent with measurements taken under comparable conditions,validating the accuracy of the model.Additionally,in the radial direction of the tunnel,the amplitude of daily temperature fluctuation decreases as the distance from the lining surface increases.Similarly,both daily and weekly temperature fluctuations diminish at greater radial distan

关 键 词：安全工程 温度场 冻害 日周期波动 

分 类 号：X951[环境科学与工程—安全科学]