Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (4): 392398.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. 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
Evaluation of creep models for frozen soils
XiaoLiang Yao1, MengXin Liu1, Fan Yu1, JiLin Qi2
- 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
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.
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