Implicit Algorithm for Modeling Unsaturated Soil Response in Three-Invariant Stress Space
Publication: International Journal of Geomechanics
Volume 8, Issue 4
Abstract
An implicit integration algorithm has been refined to predict the stress–strain–strength response of unsaturated soil under suction-controlled, multiaxial stress paths that are not achievable in a conventional cylindrical cell. The algorithm supports numerical analyses in a deviatoric plane by using a mixed control constitutive driver, in conjunction with a generalized Cam-Clay model that also incorporates the influence of a third stress invariant, or Lode-angle , within a constant-suction scheme. True triaxial data from a previously accomplished series of suction-controlled triaxial compression, triaxial extension, and simple shear tests on 10-cm cubical specimens of silty sand, were used for the tuning and validation of the refined algorithm. The elliptical Willam–Warnke surface was adopted for simulation of unsaturated soil response in three-invariant stress space. Reasonably satisfactory agreement was observed between experimental and predicted deviatoric stress versus principal strain response for different suction states, as well as between experimental and predicted strength loci in a deviatoric plane.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 8 • Issue 4 • July 2008
Pages: 266 - 273
Copyright
© 2008 ASCE.
History
Received: Mar 8, 2007
Accepted: Aug 28, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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