Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (10): 3279-3288.doi: 10.16285/j.rsm.2020.0045

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A unified thermo elastoplastic constitutive model describing the temperature effect of saturated and unsaturated soils

LIU Yi1, 2, CAI Guo-qing1, 2, LI Jian1, 2, ZHAO Cheng-gang2, 3   

  1. 1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 3. School of Civil Engineering, Guilin University of Technology, Guilin, Guangxi 541004, China
  • Received:2020-01-13 Revised:2020-07-29 Online:2020-10-12 Published:2020-11-05
  • Supported by:
    This work was supported by the General Program of Natural Science Foundation of Beijing Municipality (8202038), the National Natural Science Foundation of China (51722802, U1834206, 51678041) and the Fundamental Research Funds for the Central Universities (2020JBM048).

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Abstract: Many geotechnical problems, such as development and utilization of geothermal resources and nuclear waste disposal, need to consider the effect of temperature on the stress and strain properties of saturated and unsaturated soils. To consider the effects of temperature and suction on the preconsolidation stress change for soils, expressions of preconsolidation stress for soils at different temperatures are first introduced. After that, combining the expression with the yield surface of unified state parameter model for clay and sand, considering the influence of temperature and suction on the normal consolidation line and critical state line, a unified thermo elastoplastic constitutive model describing the temperature effect of saturated and unsaturated soils is proposed. The proposed constitutive model is divided into saturated part (suction less than the air entry value or bubbling pressure at certain temperature) and unsaturated part (suction more than the air entry value or bubbling pressure at certain temperature). The comparisons between the model predictions and experimental data indicate that the proposed model can quantitatively predict the stress and strain properties of saturated and unsaturated soils at different temperatures.

Key words: unsaturated soil, constitutive model, temperature, suction

CLC Number: 

  • TU 411
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