摘要
冻土地区季节性的温度变化、大气升温以及人类工程活动加剧,常引起桩基冻胀融沉、倾斜、混凝土开裂等灾害,造成桩基的承载力降低,给寒区冻土桩基带来新的更大挑战。通过回顾国内外相关文献,对冻土桩基的承载性能目前的研究现状进行了总结。从特殊的冻土性质出发,描述了冻土桩基体系主要的受力形式及其作用特征;从桩–冻土界面力学特性试验及荷载传递机制两个方面,阐述了冻土区桩–土界面力学特性变化机制;从试验研究、理论分析以及数值模拟三个方面,阐明了冻土桩基承载性能变化规律及分析、预测方法;归纳了冻土区桩–土体系温度、水分、应力应变等方面的监测技术。对寒区冻土桩基承载特性未来的研究提出了展望。
In cold regions,seasonal temperature variations,atmospheric warming,and intensified human engineering activities often lead to disasters such as frost heaving,thaw settlement,tilting,and concrete cracking in pile foundations.These incidents often result in the decrease of the bearing capacity of pile foundations,posing new and greater challenges to pile foundations in cold regions.The current research status of the bearing capacity of frozen soil pile foundations was summarized.Based on the unique properties of frozen soil,the main force types and characteristics of frozen soil pile foundation systems were described;the changing mechanisms of mechanical properties at the pile-frozen soil interface were detailed in terms of experimental testing and the load transfer mechanism;the variations in the bearing capacity of frozen soil pile foundations and the methods for analysis and prediction were illustrated from the perspectives of experimental tests,theoretical analyses and numerical simulations;main monitoring techniques for temperature,moisture,stress and strain in the pile-frozen soil system were also described.Finally,prospects for future research on the bearing characteristics of frozen soil pile foundations in cold regions were presented.
作者
唐丽云
丁冰
郑建国
许培智
邱培勇
Tang Liyun;Ding Bing;Zheng Jianguo;Xu Peizhi;Qiu Peiyong(School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,Shaanxi,China;Xinjiang Architecture Design Institute Co.,Ltd.,Urumqi 830002,Xinjiang,China;China Jikan Research Institute of Engineering Investigation and Design Co.,Ltd.,Xi’an 710043,Shaanxi,China)
出处
《岩土工程技术》
2024年第3期253-262,共10页
Geotechnical Engineering Technique
基金
国家自然科学基金(42071100,42271144)
陕西省秦创原“科学家+工程师”队伍建设(2022KXJ-086)。
关键词
冻土
桩基承载性能
桩–土界面
监测
frozen soil
bearing capacity of pile foundation
pile-frozen soil interface
monitoring
