Torsional Shear Behavior of Anisotropically Consolidated Sands
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 2
Abstract
This study addresses the effects of anisotropic consolidation on sand behavior by comparing the detailed response of undrained torsional shearing of two sands isotropically and anisotropically consolidated to a range of consolidation stresses and relative densities. Anisotropic consolidation does not appear to alter the mobilized angle of shearing resistance at failure and phase transformation during torsional loading. However, anisotropic consolidation greatly affects the response of the two sands; flow deformation was observed for anisotropically consolidated loose specimens in contrast with limited flow deformation exhibited by their isotropically consolidated counterparts. For the specimens exhibiting brittleness, the instability line is well defined for both isotropically and anisotropically consolidated specimens and it appears to have the same slope in a Mohr-Coulomb diagram independent of the consolidation path followed. However, differences are observed in the peak strength, strength at phase transformation, and peak stress ratio. A stress level dependency of the stress paths and stress-strain curves is observed for both sands, which is exacerbated at higher consolidation stress levels for anisotropically consolidated specimens. Finally, the stiffness variation for both isotropically and anisotropically consolidated specimens over a range of strains is presented herein.
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Acknowledgments
This research has been co-financed by the European Union (European Social Fund-ESF) and Greek national funds through the Operational Program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF)-Research Funding Program (Heracleitus II. Investing in Knowledge Society through the European Social Fund).
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 2 • February 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Aug 25, 2012
Accepted: Jun 21, 2013
Published online: Jun 24, 2013
Published in print: Feb 1, 2014
Discussion open until: Apr 21, 2014
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