Constitutive Modeling of Inherently Anisotropic Sand Behavior
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 128, Issue 10
Abstract
A plasticity constitutive framework for modeling inherently anisotropic sand behavior is presented within a modified form of critical state soil mechanics. A second-order symmetric fabric tensor, describes the material inherent anisotropy, and a scalar-valued anisotropic state variable A is properly defined in terms of a joint invariant of and the stress tensor. The location of the critical state line in the plane of void ratio and effective mean normal stress is not fixed but depends on A, rendering the soil dilatancy also a function of A. In addition, the plastic modulus is made a function of A. The incorporation of these two modifications in terms of A in an existing stress-ratio bounding surface model, achieves the successful simulation of both the contractive and dilative responses of sand over a wide range of variations in stress and density as shown by experimental data. Of particular significance are the results which exhibit the drastic effect of different principal stress orientations in reference to the material axes of anisotropy.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 128 • Issue 10 • October 2002
Pages: 868 - 880
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Dec 26, 2000
Accepted: Mar 23, 2002
Published online: Sep 13, 2002
Published in print: Oct 2002
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