高寒区隧道近洞口冻害防控方法研究  

RESEARCH ON FROST DAMAGE PREVENTION AND CONTROL OF TUNNEL PORTAL IN HIGH COLD REGION

作　　者：刘宇 马朋辉 凌贤长[2,3] 唐亮 LIU Yu;MA Peng-hui;LING Xian-zhang;TANG Liang(No.Three Engineering Co.,Ltd.,of CCCC First Highway Engineering Co.,Ltd.,101102,Beijing,China;School of Civil Engineering,Harbin Institute of Technology,150090,Harbin,China;Chongqing Research Institute,Harbin Institute of Technology,401135,Chongqing,China)

机构地区：[1]中交一公局第三工程有限公司,北京101102 [2]哈尔滨工业大学土木工程学院,哈尔滨150090 [3]哈尔滨工业大学重庆研究院,重庆401135

出　　处：《建筑技术》2023年第13期1638-1642,共5页Architecture Technology

基　　金：国家自然科学基金项目(41731288);住房和城乡建设部研究开发项目(K20221189);重庆市建设科技计划项目(城科字2022第1-1号)。

摘　　要：基于水-热-力多场耦合分析方法建立了隧道近洞口三维分析模型,研究了寒区隧道近洞口冻胀特征,提出了一种保温隔热和防冻缓冲的复合功能层,分析了复合功能层参数对隧道冻害防控效果的影响。结果表明,多场耦合分析方法能合理计算温度场和衬砌冻胀力;3月中旬隧道围岩在边墙位置达到最大冻结厚度;二次衬砌冻胀力在冻结开始2个月达到最大冻胀力的85%,且在2月初达到峰值,隧道边墙位置冻胀力约为仰拱位置的5.5倍。二次衬砌的抗冻性能随着复合功能层厚度和弹性模量的增加以及等效导热系数减小而提高。The frost heave characteristics of tunnel portals in cold regions were studied with a 3D tunnel portal analysis model on water-heat-force coupling analysis.A composite functional layer featuring thermal insulation and anti-freezing buffer was proposed,and the impact of the parameters of the composite functional layer on frost damage prevention and control of tunnels were analyzed.Results show that the temperature field and lining frost heave force can be calculated reasonably by means of multi-field coupling analysis,the surrounding rocks of tunnels reach the maximum frozen thickness at the side wall in mid-March,the secondary lining frost heave force reach 85%of the maximum value within the first two months of freezing and the peak in early February,and the frost heave force at the side walls of tunnels is about 5.5 times that at the inverted arches.The frost resistance of the secondary lining rises as the thickness and elastic modulus of the composite functional layer increase and the equivalent thermal conductivity decreases.

关 键 词：冻害防控 冻胀力 温度场 隧道洞口 寒区隧道 

分 类 号：TU74[建筑科学—建筑技术科学]