寒区桩基热稳定性研究进展  

Research progress of piles' thermostability in cold regions

作　　者：陈辉[1,2] 张泽 冯文杰 史向阳 明姣 杜玉霞 CHEN Hui;ZHANG Ze;FENG Wenjie;SHI Xiangyang;MING Jiao;DU Yuxia(School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China)

机构地区：[1]兰州大学土木工程与力学学院,甘肃兰州730000 [2]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2018年第2期362-369,共8页Journal of Glaciology and Geocryology

基　　金：中国科学院"西部之光"博士项目(张泽);国家自然科学基金项目(41771078);青海省交通科学研究院开放基金项目(2016-01-04)资助

摘　　要：桩基础锚固长度大、埋置深,对地温场的扰动小、回冻快,在青藏高原多年冻土区被广泛使用。寒区桩基热稳定性研究是一个交叉面广、综合性较强的问题,它涉及到传热学、冻土学、桩基础的设计、桩-土相互作用等多方面的内容。在大量文献基础上,从现场试验、模型试验、理论计算等角度,对寒区桩基热稳定研究现状进行了总结和分析,文献研究表明:土体回冻过程受众多因素影响,而影响程度最大的是混凝土浇筑时的水化热释放;在全球变暖的情形下,未来50年青藏高原冻土退化严重,对桩基热稳定性构成威胁,需要采取相应的保护措施。Due to a plenty of advantages,such as long anchorage length,deep burial,insensitivity to the changeable geothermal field and fast-refreezing,piles have been widely used in permafrost regions on the Tibetan Plateau. The study of piles＇ thermostability is always a comprehensive problem and it refers to many aspects,for instance,heat transfer theory,geocryology,design of piles,pile-soil interaction and so on. Based on lots of academic papers,the research progress of piles＇ thermostability by field and model tests and theorical calculation are summarized and analyzed in this paper. The following conclusions can be drawn： the soil refreezing procedure is affected by a lot of aspects,among which concrete hydration heat is the most significant; with the global warming,permafrost degradation will aggravate apparently on the Tibetan Plateau in the next 50 years,which threatens the piles＇ thermostability and corresponding protection measures need to be taken.

关 键 词：桩基热稳定性 土体回冻过程 气候变化 保护措施 多年冻土 

分 类 号：U443.15[建筑科学—桥梁与隧道工程] TU752[交通运输工程—道路与铁道工程]