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Development of Time Dependent Stress-Strain Simulation of Clay

Published online by Cambridge University Press:  05 May 2011

C.-Y. Ou ,
C.-C. Liu  and
C.-K. Chin
C.-Y. Ou*
Affiliation:
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, R.O.C.
C.-C. Liu*
Affiliation:
Trinity Consulting Firm, Taipei, Taiwan 10553, R.O.C.
C.-K. Chin*
Affiliation:
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, R.O.C.
*
*Professor
**Engineer
***Graduate student
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Abstract

The objective of this study is to derive a time dependent effective based constitutive law on the basis of framework of the Modified Cam-Clay model. This model takes into account the anisotropic characteristics and creep behavior, based on the theory of viscoplasticity. The model sets the initial yield surface symmetric to the Ko line for modeling the initial Ko condition. A method is then developed to compute the gyration and expansion of the loading surface to simulate the anisotropic behavior due to the principal stress gyration after shear. The creep or time dependent behavior is considered in the model by adopting Kutter and Sathialingam's model, which was derived from Taylor's secondary consolidation theory and Bjerrum's delayed compression model. Compared with the Modified Cam-Clay model, the model requires five additional parameters to describe the soil behavior. All of the additional parameters can be obtained through conventional soil tests or parametric studies. The model is evaluated through a series of simulation of undrained shear tests and undrained creep tests.

Keywords

Modified Cam-Clay modelRANI modelTime dependent behaviorCreepUndrained shear strength.
Type
Articles
Information
Journal of Mechanics , Volume 25 , Issue 1 , March 2009 , pp. 27 - 40
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2009

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