A Binary-Medium Constitutive Model for Artificially Structured Soils Based on the Disturbed State Concept and Homogenization Theory
Publication: International Journal of Geomechanics
Volume 17, Issue 7
Abstract
Triaxial compression tests were carried out on artificially structured soil samples at confining pressures of 25, 37.5, 50, 100, 200, and 400 kPa. A binary-medium constitutive model for artificially structured soils is proposed based on the experimental results, the disturbed state concept (DSC), and homogenization theory. A new constitutive model for artificially structured soils was formulated by regarding the structured soils as a binary medium consisting of bonded blocks and weakened bands. The bonded blocks are idealized as bonded elements whose deformation properties are described by elastic materials, and the weakened bands are idealized as frictional elements whose deformation properties are described by the Lade-Duncan model. By introducing the structural parameters of breakage ratio and local strain coefficient, the nonuniform distribution of stress and strain within a representative volume element can be given based on the homogenization theory of heterogeneous materials. The methods for determination of the model parameters are given on the basis of experimental results. Comparisons of predictions with experimental data demonstrate that the new model provides satisfactory qualitative and quantitative modeling of many important features of artificially structured soils.
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Acknowledgments
The authors thank the reviewers and editor for their comments and appreciate the financial support from the National Natural Science Foundation of China (NSFC) (Grants 51009103 and 51579167).
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Published In
International Journal of Geomechanics
Volume 17 • Issue 7 • July 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 18, 2016
Accepted: Oct 13, 2016
Published online: Dec 2, 2016
Discussion open until: May 2, 2017
Published in print: Jul 1, 2017
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