Elastic Anisotropic Viscoplastic Modeling of the Strain-Rate-Dependent Stress–Strain Behavior of -Consolidated Natural Marine Clays in Triaxial Shear Tests
Publication: International Journal of Geomechanics
Volume 5, Issue 3
Abstract
This paper presents a new three-dimensional (3D) anisotropic elastic viscoplastic (EVP) model for the time-dependent stress–strain behavior of -consolidated marine clays. A nonlinear creep function with a limit for the creep volumetric strain under an isotropic or odometer -consolidated stressing condition and a nonsymmetrical elliptical loading locus are incorporated in the 3D anisotropic EVP model. An -line defines the inclination of the nonsymmetrical elliptical loading locus in the plane and is commonly used for natural soils. All model parameters are determined from the results of one set of consolidated undrained compression tests and an isotropic consolidation/creep test. With the parameters determined, the 3D anisotropic EVP model is used to simulate the behavior of -consolidation tests and the strain-rate-dependent stress–strain behaviors of the -consolidated triaxial compression and extension tests on natural Hong Kong marine deposit clay specimens. These triaxial -consolidated specimens were sheared at step-changed axial strain rates from , , (unloading) and (reloading) for compression tests; or from , , (unloading), and (reloading) for extension tests, all in an undrained condition. The simulation results of all these tests are compared with the test results. The validation and limitations of the model are then evaluated and discussed.
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Acknowledgments
The work presented in this paper has received financial supports from a RGC grant (No. PolyU 5041/01E) of the University Grants Committee of the Hong Kong SAR Government of China and a grant (No. A/C: G-W040) from The Hong Kong Polytechnic University. These financial supports are gratefully acknowledged.
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Information
Published In
International Journal of Geomechanics
Volume 5 • Issue 3 • September 2005
Pages: 218 - 232
Copyright
© 2005 ASCE.
History
Received: Jul 18, 2003
Accepted: Jun 28, 2004
Published online: Sep 1, 2005
Published in print: Sep 2005
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