Simulating pressure-induced compaction by grain rearrangement

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This article presents a novel model of the compaction of loose sand, or other granular material, incorporating two dilatancy terms. One is negative, reflecting the general tendency of an assembly to collapse under a combination of shear stress and pressure. The other develops during shear straining and, at the critical state, is sufficiently large and positive to counter the negative contribution. The existence of a term producing negative dilatancy, however, suggests the concept of ‘self-cancelling shear deformation’. These shears contribute to the shear–volume coupling, producing densification, but not to the macroscopic shear deformation. They only occur when there is a small amount of damage. This produces pressure-induced densification by granule rearrangement, resulting in a model where compaction is possible under a hydrostatic load but the model can still simulate cyclic deformation and critical state behaviour.
Original languageEnglish
Pages (from-to)187-192
Number of pages6
JournalGéotechnique Letters
Volume2
Issue number4
DOIs
Publication statusPublished - Oct 2012

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compaction
Compaction
Densification
Shear deformation
critical state
dilatancy
Granular materials
Shear stress
Sand
hydrostatics
shear stress
damage
sand

Keywords

  • Compaction
  • Constitutive relations
  • Friction
  • Numerical modelling
  • Plasticity
  • Sands

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Simulating pressure-induced compaction by grain rearrangement. / Sands, C. M.; Chandler, H. W.

In: Géotechnique Letters, Vol. 2, No. 4, 10.2012, p. 187-192.

Research output: Contribution to journalArticle

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