冻土蠕变特性研究现状及展望  

Research Status and Prospect of Permafrost Creep Characteristics

作　　者：美启航 于晖[4] 陈继 MEI Qihang;YU Hui;CHEN Ji(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;Beiluhe Observation Station of FrozenSoil Environment arid Engineering,Northwest Institute of Eco-environment arid Resources,Chinese Academy of Sciences,Lanzhou 730000,China;CCCC First Highway Consultants Co.,Ltd.,Xi＇an 710065,China)

机构地区：[1]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 [2]中国科学院大学,北京100049 [3]中国科学院西北生态环境资源研究院青藏高原北麓河冻土工程与环境综合观测研究站,甘肃兰州730000 [4]中交第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《灾害学》2018年第A01期47-56,共10页Journal of Catastrophology

摘　　要：对目前冻土蠕变试验研究和模型研究的研究成果进行了总结。从微观蠕变试验和宏观蠕变试验两方面对冻土蠕变的试验研究进行介绍。分经验模型、流变模型和一般的应力-应变-时间模型对冻土蠕变本构模型研究进行分析总结。从试验研究和本构模型研究两方面介绍冻土的动蠕变研究进展。同时,也介绍了冻土与桩基之间冻结强度的研究。目前,冻土蠕变研究大都集中在短期冻结强度,尤其缺乏桩土之间蠕变变形及长期强度的相关研究。随着未来冻土区铁路、公路建设以及民用建筑等级的提高,桩基础将越来越多的被应用。为优化冻土区桩基的设计,在当前有必要加强冻土区桩基蠕变特性的研究。We summarize the research results of creep test and model research of frozen soil and introduce the creep test of frozen soil from two aspects： microscopic creep test and macro creep test. Based on empirical model,rheological model and general stress-strain time model,we analyze and summarize the creep constitutive model of frozen soil. From the two aspects of experimental research and constitutive model,the research progress of dynamic creep of frozen soil is introduced. At the same time,the freezing strength between frozen soil and pile foundation is also introduced. At present,the study of frozen soil creep mostly focuses on short-term freezing strength,especially the study of creep deformation and long-term strength of pile-soil. With the improvement of railway and highway construction and civil building grade in the permafrost regions,pile foundations will be applied more and more. In order to optimize the design of pile foundation in permafrost regions,it is necessary to study the creep characteristics of pile foundations in permafrost regions at present.

关 键 词：冻土 蠕变变形 试验 本构模型 冻结强度 

分 类 号：X43[环境科学与工程—灾害防治] P462[天文地球—大气科学及气象学]