Abstract
Artificial frozen soil is a kind of typical creep material, and the frozen clay under the unloading stress paths of high-confining pressure conforms to the improved the Zienkiewicz–Pande parabola-type yield criterion, and the Mohr–Coulomb yield function can describe the shear yield surface of artificial frozen clay under low-confining pressure. Based on the results of triaxial creep and shear tests for artificial frozen soil, the viscoplastic damage variable and evolution rule of artificial frozen clay were obtained by using the theory of viscoelastic-plastic mechanics and damage mechanics. An improved Zienkiewicz–Pande parabola-type yield criterion was used instead of a linear Newton body to obtain a coupled constitutive model of viscoelastic-plastic damage in the frozen soil under the unloading stress paths and to derive the coupling flexibility matrix for viscoelastic and viscoplastic damage. A finite element program of artificial frozen soil considering creep damage was written in the Visual Fortran 6.6A environment and embedded into the nonlinear finite element software ADINA as a user subroutine. The results of numerical simulation and laboratory testing were identical, with a maximum error of no more than 4.8%. This work shows that it is reasonable to describe the creep constitutive model of frozen soil with the viscoelastic-plastic-coupled constitutive model.
Highlights
Andersland and Douglas [1] successively proposed the creep theory of frozen soil
It is found that the relationship between the uniaxial compressive strength of frozen soil and its temperature conforms to the power function [4], and the power function is applicable to both conditions of compression and tension [5,6,7]
There have been relatively few studies of the creep damaged characteristics of deep artificial frozen soil under unloading stress paths, especially the numerical calculation of the creep damaged model of artificial frozen clay under these paths [9, 10]. e damage variable of artificial frozen soil and its law of damage evolution can be derived based on the triaxial creep test, and its creep constitutive behavior can be studied using the finite element analysis
Summary
Andersland and Douglas [1] successively proposed the creep theory of frozen soil. A series of constitutive models describing the creep yield process of frozen soil were presented, and a nonlinear yield criterion for frozen soil was proposed by Ladanyi [2, 3]. Creep tests performed under unloading stress paths of artificial frozen soil show the following [11]: Advances in Materials Science and Engineering
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