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 language | English |
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Pages (from-to) | 187-192 |
Number of pages | 6 |
Journal | Géotechnique Letters |
Volume | 2 |
Issue number | 4 |
DOIs | |
Publication status | Published - Oct 2012 |
Keywords
- Compaction
- Constitutive relations
- Friction
- Numerical modelling
- Plasticity
- Sands