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Volume 46 Issue 9
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LIANG Jingyu, QI Jilin, ZHANG Yuedong, LU Dechun, LI Haowen. Non-orthogonal elastoplastic model for frozen sand incorporating effects of temperature and confining pressure[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(9): 1889-1898. DOI: 10.11779/CJGE20230455
Citation: LIANG Jingyu, QI Jilin, ZHANG Yuedong, LU Dechun, LI Haowen. Non-orthogonal elastoplastic model for frozen sand incorporating effects of temperature and confining pressure[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(9): 1889-1898. DOI: 10.11779/CJGE20230455
shu

Non-orthogonal elastoplastic model for frozen sand incorporating effects of temperature and confining pressure

  • 1.

    School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

  • 2.

    Key Lab of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

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  • Received Date: May 22, 2023
  • Available Online: March 24, 2024
    Graphical Abstract
    • Abstract
  • The mechanical properties of frozen soils are significantly affected by temperature and confining pressure. To characterize the effects of temperature, a nonlinear relationship between the three-dimensional tensile strength and the temperature is established, which is incorporated into the yield function based on the coordinate transformation method. To characterize the effects of confining pressure, a potential strength degradation factor is established, which is used to develop the hardening parameters that effectively account for the effects of the confining pressure. Finally, based on the framework of the non-orthogonal elastoplastic model, a non-orthogonal elastoplastic constitutive model for frozen soils that can consider the effects of temperature and confining pressure is developed in the coordinate transformation space. Comparisons between the model predictions and the triaxial compression test results of the frozen silty sand demonstrate that the developed constitutive model can simulate the stress-strain relationship of frozen silty sand under different temperatures and confining pressures. The developed constitutive model characterizes the temperature effects, i.e., the increase in the peak shear strength with decreasing temperature, and the confining pressure effects, i.e., the transition from shear dilation and softening to shear contraction and hardening as reflected by the stress-strain curve under the increasing confining pressure.
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    • References (33)
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