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Volume 45 Issue 9
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ZHANG Ge, LIU Enlong. Binary-medium constitutive model for frozen soils based on CT dynamic scanning[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(9): 1888-1896. DOI: 10.11779/CJGE20220629
Citation: ZHANG Ge, LIU Enlong. Binary-medium constitutive model for frozen soils based on CT dynamic scanning[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(9): 1888-1896. DOI: 10.11779/CJGE20220629
shu

Binary-medium constitutive model for frozen soils based on CT dynamic scanning

  • 1.

    Key Laboratory of Geological Hazards in Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China

  • 2.

    College of Civil Engineering & Architecture, China Three Gorges University, Yichang 443002, China

  • 3.

    Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

  • 4.

    College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China

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  • Received Date: May 16, 2022
  • Available Online: September 06, 2023
    Graphical Abstract
    • Abstract
  • It is of great significance to carry out experimental researches on the macro-meso-mechanical properties of frozen soils to reveal the mechanism and the relationship between the meso- and the macro-meso-mechanical properties of frozen soils. The triaxial compression tests on the saturated frozen soils under four temperatures and four confining pressures are carried out by using the newly developed frozen soil triaxial instrument, which can cooperate with medical CT for dynamic scanning. A total of 8 CT dynamic scans are performed on the samples during the axial loading process. Through the statistical analysis of CT numbers and stress-strain curves, it is found that when the stress-strain curve is strain hardening, the average CT number of the frozen soil samples decreases linearly with the increase of the axial strain. When the stress-strain curve is strain softening, the average CT number of the frozen soil samples decreases rapidly at the softening stage. Based on the evolution laws of the average CT number of samples during the process of dynamic scanning, the breakage rate is characterized by the average CT number value, and the mesoscopic constitutive model for the saturated frozen soils is established, and the established constitutive model is verified through the test data. The results show that the proposed constitutive model can well predict the stress-strain behavior of frozen soils under the conventional triaxial stress path.
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    • References (37)
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