Microstructural modelling of stress-dependent behaviour of clay

Zhenyu Yin, C.S. Chang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)

Abstract

The purpose of this paper is to investigate the stress-dependent behaviour of clay during drained and undrained shearing by means of a micromechanical approach. A new micromechanical stress-strain model is developed for clay using the approach developed in earlier studies by Chang and Hicher [Chang, C.S., Hicher, P.Y., 2005. An elastic-plastic model for granular materials with microstructural consideration. International Journal of Solids and Structures 42(14), 4258-4277]. In order to model the extension test on a K0 consolidated sample, a formulation is developed to account for the stress reversal on a contact plane. The model is then used to simulate numerous stress-path tests on Lower Cromer Till and kaolin clay, including triaxial compression and extension tests, under both undrained and drained conditions, with different K0 consolidation, and different over-consolidation ratios. The applicability of the present model is evaluated through comparisons between the predicted and the measured results. The evolution of local stresses and local strains at inter-particle planes are discussed in order to explain the stress-induced anisotropy due to externally applied load. All simulations have demonstrated that the proposed micromechanical approach is capable of modelling the stress-induced anisotropy and other major features of the complex behaviour in clay. © 2008 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1373-1388
Number of pages16
JournalInternational Journal of Solids and Structures
Volume46
Issue number6
DOIs
Publication statusPublished - 15 Mar 2009
Externally publishedYes

Keywords

  • Anisotropy
  • Clays
  • Constitutive relations
  • Micromechanics
  • Plasticity
  • Stress reversal

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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