Simulating pressure-induced compaction by grain rearrangement
| Autor: | H.W. Chandler, C. M. Sands |
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| Rok vydání: | 2012 |
| Předmět: |
Dilatant
Materials science Compaction Mechanics Plasticity Geotechnical Engineering and Engineering Geology Granular material law.invention Condensed Matter::Soft Condensed Matter Shear (sheet metal) Cyclic deformation law Earth and Planetary Sciences (miscellaneous) Shear stress Geotechnical engineering Hydrostatic equilibrium |
| Zdroj: | Géotechnique Letters. 2:187-192 |
| ISSN: | 2045-2543 |
| DOI: | 10.1680/geolett.12.00034 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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