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 sampling 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.