Geomechanics and Engineering

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Effects of freeze-thaw cycle on mechanical properties of saline soil and Duncan-Chang model

  • Shukai Cheng (School of Civil Engineering and Architecture, Henan University of Science and Technology) ;
  • Qing Wang (College of Construction Engineering, Jilin University) ;
  • Jiaqi Wang (Changchun Institute of Technology) ;
  • Yan Han (College of Construction Engineering, Jilin University)
  • Received : 2023.06.26
  • Accepted : 2024.01.15
  • Published : 2024.08.10
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Abstract

In order to study the mechanical propertied and change rules of undrained shear behavior of saline soil under the freeze-thaw cycles, an improved constitutive model reflecting the effects of freeze-thaw cycles was proposed based on the traditional Duncan-Chang model. The saline soil in Qian'an County, western Jilin Province, was selected as the experimental object. Then, a set of freeze-thaw cycles (0, 1, 10, 30, 60, 90, 120) tests were conducted on the saline soil specimens, and conventional consolidated undrained triaxial shear tests were conducted on the saline soil specimens that underwent freeze-thaw cycles. The stress-strain relationship was obtained by the triaxial shear test. The model parameters have a corresponding regression relationship with the number of freeze-thaw cycles. Finally, based on the function expression of the model parameters, the modified Duncan-Chang model with the number of freeze-thaw cycles as the influence factor was established, whilst the calculation program of the modified model is compiled. Based on the test results, the stress-strain relationship of the saline soil specimen shows strain hardening. The shear strength gradually decreases with the increase of freeze-thaw cycle. The 10 freeze-thaw cycles are the turning point in the trend of changes of the mechanical properties of saline soils. The calculated and experimental stress-strain relationship are compared, and the comparison between the calculated value of the model and the experimental value showed that the two had a good consistency, which verified the validity of the modified Duncan-Chang model in reflecting the effects of the freeze-thaw cycle.

Keywords

Acknowledgement

This work was supported by Key Projects of the National Natural Science Foundation of China (Grant No. 42330708), the Key Program of International (Regional) Cooperation and Exchange of National Natural Science Foundation (Grant No. 41820104001), State Key Program of the National Natural Science Foundation of China (Grant No. 41430642) and the Special Fund for Major Scientific Instruments of the National Natural Science Foundation of China (Grant No. 41627801). We sincerely thank all the reviewers and editors for their professional comments and suggestions regarding this manuscript.

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