严寒地区高铁隧道温度场及保温层有效性分析  

Analysis of Temperature Field and Thermal Insulation Layer Effectiveness of High-Speed Railway Tunnel in Severe Cold Region

作　　者：许鹏 伍毅敏[1] 严晓东 梁炜明 胡凯巽 XU Peng;WU Yimin;YAN Xiaodong;LIANG Weiming;HU Kaixun(School of Civil Engineering,Central South University,Changsha Hunan 410075,China;Track and Maintenance Department,China Railway Harbin Bureau Group Co.,Ltd.,Harbin Heilongjiang 150001,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中国铁路哈尔滨局集团有限公司工务部,黑龙江哈尔滨150001

出　　处：《中国铁道科学》2022年第4期64-73,共10页China Railway Science

基　　金：国家自然科学基金资助项目(51478473);中国铁路总公司科技研究开发计划课题(2018K019)。

摘　　要：针对严寒地区高速铁路隧道的冻害设防,依托哈牡高铁治山隧道和虎峰岭隧道,监测并研究其温度场分布规律;基于监测结果,采用数值模拟方法分析初支与二衬间5 cm厚保温层的有效性。结果表明:2座严寒地区隧道的进口温度呈日周期循环,隧道洞口气温下降过程时长约占全天时间的3/4,升温过程时长约占1/4;隧道内温度沿纵向多呈不对称分布,且冬季隧道全线范围均会出现负温;当隧道外处于-32℃的酷寒天气时,长2555 m的治山隧道所有监测断面全天温度均在-5℃以下,而长8755 m的虎峰岭隧道均在0℃以下且中部断面全天温度均在-1.5℃以下;初支与二衬间设置5 cm厚保温层效果显著,当根据监测断面温度拟合得到的年平均温度在0℃以上、年温度振幅在11℃以下时,可防止保温层背后不冻结;日周期温度波动只影响二衬结构的温度场,在高铁隧道保温层设计和计算中可以忽略不计。This study focused on the frost damage prevention of high-speed railway tunnels in severe cold regions,the distribution law of the temperature field was monitored and studied relying on Zhishan tunnel and Hufengling tunnel in Harbin-Mudanjiang high-speed railway.Based on the monitoring results,the effectiveness of the 5 cm thick thermal insulation layer between the primary support and the secondary lining was analyzed by numerical simulation.The results show that the temperatures at the entrances of the two tunnels in severe cold region present a circadian cycle.The time of temperature decline at the tunnel entrance accounts for about 3/4 of the whole day,and that of temperature rise accounts for about 1/4.The temperature in the tunnel is mostly asymmetrically distributed along the longitudinal direction and negative temperatures will appear across the tunnel in winter.When the severely cold weather outside the tunnel reaches-32℃,the temperature of all monitoring sections of the 2,555 m long Zhishan tunnel is lower than-5℃throughout the day,while that of the 8,755 m long Hufengling tunnel is lower than 0℃and the all-day temperature of middle sections is lower than-1.5℃.The 5 cm thick thermal insulation layer laid between the primary support and the secondary lining has significant effect.When the annual average temperature and the annual temperature amplitude fitted according to the monitoring temperature of section is higher than 0℃and lower than 11℃respectively,the back of the thermal insulation layer can be prevented from freezing.The daily periodic temperature fluctuation only affects the temperature field of the secondary lining structure,which can be ignored in the design and calculation of thermal insulation layer for high-speed railway tunnel.

关 键 词：高铁寒区隧道 温度场 冻害 保温层 哈牡高铁 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]