Transformed Stress Method for Generalizing Soil Constitutive Models

Abstract

AbstractIt is important to generalize constitutive models from the triaxial compression state to the three-dimensional stress state for soils. However, there are some deficiencies in the existing methods, e.g., the using failure criteria method, the generalized shear stress ratio method, and the shape function approach using Lode’s angle or reduced Lode’s angle, for generalizing either isotropic or anisotropic constitutive models. For example, the critical state curve may be misshapen and the yield surface will appear to be curvature discontinuous if the constitutive model is generalized with the shape function approach using reduced Lode’s angle. The transformed stress (TS) space has been proposed in the authors’ former work based on the spatially mobilized plane (SMP), the Lade’s, and the generalized nonlinear strength criterion. In this paper, the TS method based on an arbitrary failure criterion is proposed. It is a simple approach to generalize constitutive models without introducing any extra parame...