A Simple Unconventional Plasticity Model Within the Multilaminate Framework

A semi micromechanical multilaminate model is introduced here to predict the mechanical behavior of soils. This model is like a bridge between micro and macro scale upon the satisfaction of minimum potential energy level during any applied stress/strain increments. The concept of this model is based on a certain number of sling planes which constitute the elastic plastic behavior of the soil. The soil behavior presents as the summation of behavior on these planes. A simple unconventional constitutive equations are used in each of the planes to describe the behavior of these planes separately. An unconventional plasticity can predict the soil behavior as a smooth curve with considering plastic deformation due to change of stress state inside the yield surface. The model is capable of predicting softening behavior of the soil in a reasonable manner due to using unconventional plasticity. The influences of induced anisotropy are included in a rational way without any additional hypotheses owing to in nature properties of the multilaminate framework. Results of this model are compared with test data and reasonable agreement is found.