摘要
保温法是目前寒区隧道建设中应用最为广泛的一种冻害防治方法。通过敷设保温材料可以减缓隧道结构、围岩体与洞内空气的热量交换过程,进而减小或避免衬砌与围岩体内的季节冻融,实现冻害防治的目的。在工程设计中,隧道保温段的敷设长度和厚度是两个关键参数,其中敷设厚度相对容易确定,但是敷设长度的确定目前缺乏统一的标准和简便可靠的方法,给隧道保温设计带来了一定的难度和不确定性。基于此,对包括现有铁路和公路规范要求、经验公式、工程类比法、理论解析法、数值模拟法等寒区隧道保温段敷设长度确定方面的工程实践、研究进展和挑战进行了系统的总结,并在此基础上提出保温设防设计用气象数据的选取方法、保温设防长度确定的依据、隧道进出口的差异性,以及季节冻土与多年冻土区隧道的差异等未来工程实践和科学研究仍需解决和研究的重点,以期能够为寒区隧道保温防冻工程设计难题的解决提供参考。
Thermal insulation is widely used to prevent frost related damages to tunnels in cold regions. By laying thermal insulation materials,the heat exchange process between the tunnel structure and air flow in the tunnel can be slowed down,and then the seasonal freeze-thaw of lining and surrounding rock mass can be diminished. In engineering design,the length and thickness of thermal insulation materials in the tunnel are the two critical parameters,among which the laying thickness is relatively easy to determine. However,at present,there is no uniform standard and simple and reliable method for determining the laying length,which brings difficulty and uncertainty to design of thermal insulation. This paper systematically summarizes the engineering practice,research progress and challenges in determining the length of insulation section of tunnel in cold regions,including the requirements of existing railway and highway specifications,empirical formulas,engineering analogy,theoretical analysis,numerical simulation and so on. Based on the summary,some key issues that still need attention in future engineering practice and research was proposed. These issues include the selection of meteorological data for thermal insulation design,the basis for determining thermal insulation length,the difference between tunnel entrance and exit,and the difference between tunnels in seasonally frozen ground and permafrost regions. It is hoped that this review can provide a reference for future in-depth study and engineering design of thermal insulation of tunnels in cold regions.
作者
庞小冲
朱小明
穆彦虎
张坤
张力杰
郑波
李凌洁
PANG Xiaochong;ZHU Xiaoming;MU Yanhu;ZHANG Kun;ZHANG Lijie;ZHENG Bo;LI Lingjie(Gansu Province Transportation Planning,Survey&Design Institute Co.Ltd.,Lanzhou 730030,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Civil Engineering,Northwest Minzu University,Lanzhou 730124,China;China Railway Southwest Research Institute Co.Ltd.,Chengdu 611731,China)
出处
《冰川冻土》
CSCD
北大核心
2022年第3期998-1010,共13页
Journal of Glaciology and Geocryology
基金
甘肃省交通运输厅科研项目(2017-008)
中国科学院科研仪器设备研制项目(28Y928581)资助。
关键词
寒区隧道
保温
设防长度
气象数据
季节冻土
多年冻土
tunnels in cold regions
thermal insulation
thermal insulation length
meteorological data
seasonally frozen ground
permafrost
