An improved creep model for unsaturated reticulated red clay

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Chuang Zhang
  • Junhui Zhang
  • Jianzhong Li

Detail(s)

Original languageEnglish
Pages (from-to)4754-4768
Number of pages15
Journal / PublicationJournal of Rock Mechanics and Geotechnical Engineering
Volume16
Issue number11
Online published12 Jun 2024
Publication statusPublished - Nov 2024

Link(s)

Abstract

Establishment of a creep model is an important method to analyze the relationship between soil creep deformation and time, and the element model is widely used for studying soil creep. However, the element creep model is employed for fitting saturated soil, and the mechanical element model is generally linear, which cannot well fit the nonlinear deformation of the soil with time in practice. The creep process of the soil is not only time-dependent, but also related to the deviatoric stress level. Therefore, the fractional calculus theory and a parameter n reflecting the effect of deviatoric stress level on the creep properties of the soil were introduced into the element model, and the fractional qBurgers creep model was established by using the fractional Koeller dashpot and Caputo fractional calculus. The proposed model was used to fit the triaxial test data of reticulated red clay under different net confining pressures and matric suctions by unsaturated triaxial apparatus. The proposed model can well describe the nonlinearity of unsaturated reticulated red clay, has memory and global correlation to the creep development process of unsaturated reticulated red clay, and has clear physical meaning. The functional relationships of the model parameters with the matric suction, net confining pressure and deviatoric stress level were deduced, so that the creep curves of unsaturated reticulated red clay can be obtained for any conditions, which is of great value for the study of unsaturated soils. © 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences.

Research Area(s)

  • Burgers, Creep model, Fractional calculus, Parameter study, Unsaturated reticulated red clay

Citation Format(s)

An improved creep model for unsaturated reticulated red clay. / Zhang, Chuang; Zhang, Junhui; Li, Jianzhong.
In: Journal of Rock Mechanics and Geotechnical Engineering, Vol. 16, No. 11, 11.2024, p. 4754-4768.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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