THE MIDDLE SURFACE CONCEPT AND ITS APPLICATION FOR GEOMATERIALS

Abstract eng:
A new constitutive modeling concept named the “Middle Surface Concept (MSC)” is presented. The Middle Surface Concept is an original and novel constitutive modeling concept for characterizing the mechanical behavior of geomaterials such as sands and clays. In contrast to a single yield surface used in the traditional elastoplasticity theory, in the Middle Surface Concept multiple yield surfaces are used. Among them, one is the “true yield surface” and the rest are “pseudo yield surfaces”. The stress point lies on the true yield surface during plastic deformations and the true yield surface is constructed using the pseudo yield surfaces. Different pseudo yield surfaces can represent different features of the mechanical behavior that are difficult to be represented in a combined fashion using a single yield surface. The true yield surface and the pseudo yield surfaces are linked through common quantities such as plastic shear strain and confining pressure or relationships between certain quantities such as shear stress or void ratio. The application of the Middle Surface Concept to modeling the behavior of sands is first presented. The state parameter concept and stress-induced anisotropy in sands are considered within the critical state soil mechanics for both monotonic and cyclic loading. The use of the Middle Surface Concept to modeling the behavior of clays is then discussed.

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