Strain-Dependent and Stress-Dependent Creep Model for a Till Subject to Triaxial Compression
Publication: International Journal of Geomechanics
Volume 16, Issue 3
Abstract
Soil exhibits creep behavior, in which the deformation of soil develops with time at a state of constant effective stress. A series of triaxial compression creep tests was performed on a saturated till to investigate the creep behavior at different effective stresses and strains of the samples. In the tests, the saturated till was allowed to creep in single, multiple, and stepwise stages. The dependency of creep rate of the saturated till on time was examined using the test data. It was found that the time-dependent creep rate models are incapable of describing the creep behavior of soil under the condition of multiple-stage creep, i.e., complex load conditions. A strain-dependent and stress-dependent creep model of the saturated till subject to triaxial compression was proposed. In the model, the creep rate of soil was formulated as a function of inelastic strain and effective stresses instead of time and effective stresses. This model could describe the dependencies of soil creep rate on time, strain, and effective stress observed in the triaxial compression creep tests. Test data obtained in the creep tests were used to verify the proposed model. Moreover, a methodology to accelerate the creep test for soil was developed.
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Acknowledgments
This study was made possible with financial support from the Natural Sciences and Engineering Research Council of Canada and the Department of Civil Engineering, University of Calgary. Dr. Heinrich Heinz from Thurber Engineering provided the till samples and some valuable comments on the laboratory tests. The authors express their gratitude to anonymous reviewers for their valuable comments.
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Published In
International Journal of Geomechanics
Volume 16 • Issue 3 • June 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 30, 2014
Accepted: Jul 9, 2015
Published online: Dec 17, 2015
Discussion open until: May 17, 2016
Published in print: Jun 1, 2016
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