City Research Online

Abstract

Even mild compression can cause re-arrangement of the internal structure of clay-like geomaterials, whereby clusters of particles rotate and collapse as face-to-face contacts between the constituent mineral platelets increase at the expense of edge-to-face (or edge-to-edge) contacts. The collective action of local particle re-orientation ultimately leads to path-independent isochoric macroscopic deformation under continuous shearing. This asymptotic condition is the governing feature of Critical State elasto-plasticity models. Unlike earlier formulations, the two-surface anisotropic model proposed herein is able to reproduce a unique isotropic Critical State stress envelope which agrees well with test data. Material point predictions are compared against triaxial experimental results and five other existing constitutive models. The hyperplastic formulation is seen to offer a significantly improved descriptor of the anisotropic behaviour of fine-grained
particulate materials.

Publication Type:	Article
Publisher Keywords:	Two-surface anisotropy, hyperplasticity, Critical State, implicit stress integration, algorithmic tangent
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Departments:	School of Science & Technology
SWORD Depositor:	Symplectic Administrator

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