Effect of Intermediate Principal Stress on Overconsolidated Kaolin Clay
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 130, Issue 3
Abstract
The influence of intermediate principal stress on the mechanical behavior of overconsolidated kaolin clay is investigated using three-dimensional true triaxial testing on cubical specimens. A flexible boundary, true triaxial setup with a real-time feedback control system was used to test soil specimens under stress and strain-control modes. Undrained tests on kaolin clay show that the following vary with intermediate principal stress: the stiffness at small strains, excess pore pressure generated during shear, and strength and strain to failure. Failure occurred at peak deviator stress followed by shear band formations and localized bulging. Prior theoretical formulations of bifurcation and undrained instability support these experimental observations. Analysis of data in the octahedral plane indicates that kaolin clay follows a nonassociative flow rule, which is described by a constant third stress invariant failure criterion with von Mises plastic potential surface.
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Information & Authors
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 130 • Issue 3 • March 2004
Pages: 284 - 292
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jul 22, 2002
Accepted: Jul 2, 2003
Published online: Feb 19, 2004
Published in print: Mar 2004
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