Strength and Dilatancy of Overconsolidated Clays in Drained True Triaxial Tests
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 140, Issue 4
Abstract
The long-term mechanical behavior of overconsolidated (OC) clays in three-dimensional (3D) stress states plays an important role in many geotechnical problems, such as slope failures. However, previous experimental studies of OC clay were carried out under undrained conditions. This paper presents the results of a series of drained true triaxial tests on normally consolidated (NC) and OC clays. The stress paths were maintained in the same with Lode angles of . The test results show that OC clays exhibit positive dilatancy tendencies and greater shear strengths and smaller strains to failure than NC clays. The shear strength and dilatancy are largely influenced by the Lode angle. As the Lode angle increases, the shear strength and dilatancy decrease. The decreasing gradients of shear strength and dilatancy versus Lode angle are almost the same, indicating that the constitutive models for OC and NC clays can share the same rules for strength and dilatancy. The formation of shear bands in the specimens appears to have caused the abnormal test results in that case.
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Acknowledgments
The authors express their appreciation to Mr. Satoshi Sakagawa, who carried out the bulk of the tests. The financial support of National Nature Science Foundation of China (Grant No. 41002097) is gratefully acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 140 • Issue 4 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jun 7, 2012
Accepted: Oct 21, 2013
Published online: Dec 4, 2013
Published in print: Apr 1, 2014
Discussion open until: May 4, 2014
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