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Acta Geotechnica

, Volume 14, Issue 2, pp 253–277 | Cite as

A fabric-based sand plasticity model with reversal surfaces within anisotropic critical state theory

  • Achilleas G. PapadimitriouEmail author
  • Yannis K. Chaloulos
  • Yannis F. Dafalias
Research Paper
  • 229 Downloads

Abstract

The paper describes the formulation and capabilities of a new constitutive model that accounts for the effects of fabric anisotropy on the response of granular materials under monotonic loading. It is developed within the framework of bounding surface plasticity in conjunction with the concept of (stress) reversal surfaces, i.e., the use of the last stress reversal point as projection center for defining the image stress on the bounding surface. A key constitutive ingredient is the fabric anisotropy variable A, relating the fabric tensor to the plastic strain rate direction, that acquires the value A = 1 as the third requirement for critical state according to the anisotropic critical state theory. This A is used in the definition of dilatancy, the plastic modulus and the evolution equation of the fabric tensor, thus simulating experimental results that show more dilative and stiff response when the loading is applied along the direction of the fabric. Model performance is verified against a large database of monotonic shearing tests on samples of Toyoura sand prepared with three different methods, as well as similar tests on samples whose (initially horizontal) deposition plane was rotated by up to 90 degrees. All simulations are performed with a single set of constants, thus validating the efficiency of the model to account for density, stress level and, most importantly, fabric anisotropy effects on the monotonic shearing response. The paper shows that considering dependence of strength and dilatancy on Lode angle θ and state parameter ψ does not suffice for simulating fabric anisotropy effects on sand response. It ends with a discussion of how fabric effects on sand response are more pronounced under undrained, versus drained conditions.

Keywords

Anisotropic critical state theory Bounding surface plasticity Constitutive model Fabric anisotropy Sands 

Notes

Acknowledgements

The research leading to these results has received funding from the European Research Council (ERC) under the European Union’s Seventh Framework Program (FP7/2007-2013)/ERC IDEAS Grant Agreement n# 290963 (SOMEF) and partial support by the National Science Foundation (NSF) project CMMI-1162096. The authors are grateful to the two reviewers for their insightful comments that improved the quality of the manuscript.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Civil Engineering, Department of Geotechnical EngineeringNational Technical University of AthensZografouGreece
  2. 2.Department of Civil and Environmental EngineeringUniversity of CaliforniaDavisUSA
  3. 3.School of Applied Mathematical and Physical Sciences, Department of Mechanics, I. Vardoulakis Laboratory of GeomaterialsNational Technical University of AthensZografouGreece

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