Extended UH Model: Three-Dimensional Unified Hardening Model for Anisotropic Clays
Publication: Journal of Engineering Mechanics
Volume 138, Issue 7
Abstract
Extended UH model is a three-dimensional elastoplastic constitutive model that builds on a modification of the UH model with a unified hardening parameter, to account for the effect of anisotropy and the influence of consolidation on the stress-strain-strength behavior of clays. The combined effects of anisotropy and stress magnitude are considered through the minimum value of angles () made by the spatially mobilized planes (SMPs) and soil depositional plane. The original transformed stress tensor is revised by incorporating the anisotropic peak stress ratio , which is defined as a function of , with the stress tensor . The comparison with test results on San Francisco Bay Mud demonstrates the capability of the proposed anisotropic criterion. The UH model is extended to account for the combined effects of inherent anisotropy and conditions on the stress-strain-strength response of anisotropic clays by incorporating the revised transformed stress tensor , the potential strength ratio , the characteristic stress ratio , and the state stress ratio . A series of undrained triaxial tests on isotropically and anisotropically consolidated specimens with different overconsolidation ratios (OCRs) are successfully predicted using the proposed extended UH model. New parameters for anisotropic soils can be determined conveniently from the conventional triaxial compression tests on vertical and horizontal specimens.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant No. 11072016, No. 51179003, and No. 90815024). The writers would like to acknowledge many insightful discussions with Wei Hou. The writers would also like to thank J. Chu for reviewing the paper and for his valuable suggestions.
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© 2012. American Society of Civil Engineers.
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Received: May 7, 2011
Accepted: Dec 19, 2011
Published online: Dec 23, 2011
Published in print: Jul 1, 2012
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