Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (4): 392–398.doi: 10.3724/SP.J.1226.2015.00392

• ARTICLES • 上一篇    

Evaluation of creep models for frozen soils

XiaoLiang Yao1, MengXin Liu1, Fan Yu1, JiLin Qi2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. School of Civil and Transportation Engineering, Beijing University of Architecture and Civil Engineering, Beijing 100044, China
  • 收稿日期:2015-02-10 修回日期:2015-04-16 发布日期:2018-11-23
  • 通讯作者: Ph.D., XiaoLiang Yao, Associate Professor of School State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China. Tel: +86-931-4967258; E-mail: yaoxl@lzb.ac.cn E-mail:yaoxl@lzb.ac.cn
  • 基金资助:
    This work was supported in part by the National Natural Science Foundation of China (No. 41201064 and No. 41172253) and the National Key Basic Research (973) Program of China (Grant No. 2012CB026106).

Evaluation of creep models for frozen soils

XiaoLiang Yao1, MengXin Liu1, Fan Yu1, JiLin Qi2   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. School of Civil and Transportation Engineering, Beijing University of Architecture and Civil Engineering, Beijing 100044, China
  • Received:2015-02-10 Revised:2015-04-16 Published:2018-11-23
  • Contact: Ph.D., XiaoLiang Yao, Associate Professor of School State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences. No. 320, West Donggang Road, Lanzhou, Gansu 730000, China. Tel: +86-931-4967258; E-mail: yaoxl@lzb.ac.cn E-mail:yaoxl@lzb.ac.cn
  • Supported by:
    This work was supported in part by the National Natural Science Foundation of China (No. 41201064 and No. 41172253) and the National Key Basic Research (973) Program of China (Grant No. 2012CB026106).

摘要: To model the creep behavior of frozen soils, three creep stages have to be reasonably described (i.e., primary, secondary and tertiary stages). Based on a series of uniaxial creep test results, three creep models were evaluated. It was shown that hypoplastic creep model has high prediction accuracy for both creep strain and strain rate in a wide stress range. The elementary rheological creep model can only be used for creep strains at low stress levels, because of the restraints of its mathematical construction. For the soft soil creep model, the progressive change from the primary to secondary and tertiary stages cannot be captured at high stress levels. Therefore, the elementary rheological and soft soil creep models can only be used for low stress levels without a tertiary stage; while the hypoplastic creep model is applicable at high stress levels with the three creep stages.

关键词: frozen soil, creep models, three creep stages, predicting accuracy

Abstract: To model the creep behavior of frozen soils, three creep stages have to be reasonably described (i.e., primary, secondary and tertiary stages). Based on a series of uniaxial creep test results, three creep models were evaluated. It was shown that hypoplastic creep model has high prediction accuracy for both creep strain and strain rate in a wide stress range. The elementary rheological creep model can only be used for creep strains at low stress levels, because of the restraints of its mathematical construction. For the soft soil creep model, the progressive change from the primary to secondary and tertiary stages cannot be captured at high stress levels. Therefore, the elementary rheological and soft soil creep models can only be used for low stress levels without a tertiary stage; while the hypoplastic creep model is applicable at high stress levels with the three creep stages.

Key words: frozen soil, creep models, three creep stages, predicting accuracy

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