Finite Element Simulations of an Elasto-Viscoplastic Model for Clay

TL;DR

This paper introduces a novel elasto-viscoplastic model for clay that incorporates multiple theories and parameters, implemented via finite-element simulations, and validated against experimental data for various clay types.

Contribution

The paper develops a new EVP model for clay using a modified Perzyna's theory, integrated with critical state soil mechanics and multi-surface theory, and demonstrates its effectiveness through finite-element simulations.

Findings

Model shows good agreement with experimental data

Applicable to different clay types including Osaka and Hong Kong Marine Deposit

Enhances understanding of clay behavior under various conditions

Abstract

In this paper, we develop an elasto-viscoplastic (EVP) model for clay using the non-associated flow rule. This is accomplished by using a modified form of the Perzyna's overstressed EVP theory, the critical state soil mechanics, and the multi-surface theory. The new model includes six parameters, five of which are identical to those in the critical state soil mechanics model. The other parameter is the generalized nonlinear secondary compression index. The EVP model was implemented in a nonlinear coupled consolidated code using a finite-element numerical algorithm (AFENA). We then tested the model for different clays, such as the Osaka clay, the San Francisco Bay Mud clay, the Kaolin clay, and the Hong Kong Marine Deposit clay. The numerical results show good agreement with the experimental data.