Particular Behaviors of Quasi-Plastic Viscous Elastic Model under Consolidation

Abstract

Hypothesis A in clay rheology is widely used in practical engineering. It is important to explore its theoretical basis and proper scope of application in practical engineering. To build the relation between Hypotheses A and B, a quasi-plastic viscous concept is defined on the basis of hyperviscoplasticity. An equivalent-time nonlinear rheological model is proven to be one of the elastic quasi-plastic viscous models. From the perspective of the quasi-plastic viscous concept and this model, modified Hypothesis A is proven to be approximately equivalent to Hypothesis B under constant vertical stress in one-dimensional compression when the separation condition is satisfied. The consolidation behavior of clay with large quasi-preconsolidation pressure and vertical drains is numerically analyzed. A new phenomenon is predicted qualitatively and quantitatively in this clay, indicating that the larger the secondary consolidation coefficient is, the higher the degree of consolidation is when the original effective stress, the original void ratio, the original absolute equivalent time, the swelling index, and the compressive index remain constant.