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Geomechanics and Engineering
  Volume 7, Number 2, August 2014, pages 213-231
DOI: http://dx.doi.org/10.12989/gae.2014.7.2.213
 


An elastoplastic model for structured clays
Bo Chen, Qiang Xu and De'an Sun

 
Abstract
    An elastoplastic model for structured clays, which is formulated based on the fact that the difference in mechanical behavior of structured and reconstituted clays is caused by the change of fabric in the post-yield deformation range, is present in this paper. This model is developed from an elastoplastic model for overconsolidated reconstituted clays, by considering that the variation in the yield surface of structured clays is similar to that of overconsolidated reconstituted clays. However, in order to describe the mechanical behavior of structured clays with precision, the model takes the bonding and parabolic strength envelope into consideration. Compared with the Cam-clay model, only two new parameters are required in the model for structured clays, which can be determined from isotropic compression and triaxial shear tests at different confining pressures. The comparison of model predictions and results of drained and undrained triaxial shear tests on four different marine clays shows that the model can capture reasonable well the strength and deformation characteristics of structured clays, including negative and positive dilatancy, strain-hardening and softening during shearing.
 
Key Words
    structured clay; reconstituted clay; bonding; fabric; elastoplastic model
 
Address
(1) Bo Chen:
College of Civil Engineering and Architecture, Quzhou University, Quzhou, 324000, China;
(2) Bo Chen, Qiang Xu, De'an Sun:
State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology, Chengdu, 610059, China;
(3) De'an Sun:
Department of Civil Engineering, Shanghai University, Shanghai, 200072, China.
 

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