A micromechanics-based model for sand-silt mixtures

Zhenyu Yin, J. Zhao, P.-Y. Hicher

Research output: Journal article publicationJournal articleAcademic researchpeer-review

139 Citations (Scopus)


Experimental observations have shown the significant impact of fines or coarse grains on the behavior of sand-silt mixtures. To describe the behavior of sand-silt mixtures under both drained and undrained conditions, this paper presents a mathematical model based on a micromechanical approach. The novelty of this model is the introduction of the equivalent mean size and the evolution of the position of the critical state line with fines content for various sand-silt mixtures. The predictive capability of the model was evaluated by comparing the model simulations with experimental results on undrained triaxial tests of Foundry sand-silt mixtures with fines content, fc = 0-100% and Ottawa sand-silt mixtures with fines content fc = 0-50%, and on drained triaxial tests of Hong Kong Completely Decomposed Granite (HK-CDG) mixtures before and after erosion. The predicted local behavior in the contact planes has also been examined. It shows that all local contact planes are mobilized to different degrees in terms of local stress and strain and that a few active contact planes contribute dominantly to the deformation of the assembly, leading to an anisotropic global behavior when the soil is subjected to external loading. © 2013 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1350-1363
Number of pages14
JournalInternational Journal of Solids and Structures
Issue number6
Publication statusPublished - 15 Mar 2014
Externally publishedYes


  • Constitutive relations
  • Critical state
  • Elasto-plasticity
  • Micromechanics
  • Sand
  • Silts

ASJC Scopus subject areas

  • Modelling and Simulation
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics


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