Strain Localization in Unsaturated Elastic-Plastic Materials Subjected to Plane Strain Compression
Publication: Journal of Engineering Mechanics
Volume 140, Issue 7
Abstract
Analytical solutions have been derived for the onset of strain localization in a broad class of unsaturated elastic-plastic porous materials based on Bishop’s definition of effective stress. Critical hardening moduli for constant water content and drained loadings were found to be further gradual simplifications of the critical hardening modulus for an undrained loading. In addition, the solutions were found to reduce to the previously found solutions for fully saturated and monophasic porous materials by adequately adjusting bulk moduli of the pore fluids. This finding demonstrates that the mechanics of fully saturated and monophasic soils is the special simpler case of the mechanics of unsaturated soils. A diagnostic tool for detection of the inception of strain localization was developed by implementing the aforementioned solutions into a constitutive driver for a bounding surface plasticity model. The tool was used to further illustrate the strain localization behavior of unsaturated Bourke silt from the Bourke region of New South Wales, Australia, subjected to undrained, constant water content and drained loadings.
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Acknowledgments
D. P. gratefully acknowledges the financial support and hospitality provided by the University of New South Wales, Sydney, Australia. G. Z. gratefully acknowledges the support received from the Australian Research Council (Grant No. DE 130100457).
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 140 • Issue 7 • July 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jan 21, 2013
Accepted: Jan 3, 2014
Published online: Feb 6, 2014
Published in print: Jul 1, 2014
Discussion open until: Jul 6, 2014
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