Analysis of Viscoelastic Behavior of Soil by Means of Finite Element Method (1)

Determination of Viscoelastic Constants of Soil

Abstract

In order to obtain viscoelastic constants of soil the authors have derived theoretically the constitutive equation for the assumed 3 element Voigt model in mono axial stress state.
Tests of stress relaxation of artificial soil were done and from these results viscoelastic constants E, E₁ and η₂ were found. From the comparison analysis between actual stress relaxation curve and theoretical one it was found that the theoretical values and experimental ones coincided with initial peak stress and residual stress. Shape of stress relaxation curve depended on the value of η₁, and η₁ was not constant but varied by the experimental stress value at certain elapsed time, which dominated the value of η₁. This is unavoidable limit under an assumption of 3 element Voigt model.