A constitutive model for gravelly soils considering shear-induced volumetric deformation

Bin Lin Chu*, Yeun Wen Jou, Meng-Chia Weng

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

This study elucidates the deformational behavior of gravelly soils by analyzing how hydrostatic pressure and pure shearing affect deformational behavior. A series of drained, triaxial compression tests have been performed using large specimens made of gravelly soils, where the grain-size distribution curve was based on the field condition. The volumetric and shear deformations of gravelly soils have been determined by performing experiments with controlled stress paths - hydrostatic pressure was applied first followed by pure shearing. A simple and innovative constitutive model is also proposed. The proposed model is characterized by the following features of gravelly soils: (i) significant shear-induced volumetric deformation prior to failure, (ii) modulus stiffening under hydrostatic loading and degradation under shearing, and (iii) stress-induced anisotropy. In the proposed model, deformational moduli K and G vary according to the stress state. The stiffening and degradation of these moduli result in diverse deformational behavior of gravelly soils. In addition, an anisotropic factor, b, is introduced to represent stress-induced anisotropy. Moreover, the proposed model only requires eight material parameters; each of which can be obtained easily from experiments.

Original languageEnglish
Pages (from-to)662-673
Number of pages12
JournalCanadian Geotechnical Journal
Volume47
Issue number6
DOIs
StatePublished - 1 Jun 2010

Keywords

  • Constitutive model
  • Gravelly soil
  • Pure shearing
  • Shear-induced volumetric deformation

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