Shear band evolution phenomena in direct shear test modelled with DEM
| Autor: | A. Grabowski, Michał Nitka |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Field (physics)
Scale (ratio) General Chemical Engineering 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Measure (mathematics) Shear (sheet metal) Void ratio 020401 chemical engineering Direct shear test 0204 chemical engineering 0210 nano-technology Focus (optics) Shear band Geology |
| Zdroj: | Powder Technology. 391:369-384 |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2021.06.025 |
| Popis: | A direct shear test is widely used in the geotechnical engineering field. It is an easy and quick test to measure the shear properties of soil. This test often replaces more expensive and difficult tri-axial shear test. Despite that the direct shear test is known and used for a long time, it is still not well investigated at the grain scale. This paper deals with the micro behaviour of the cohesionless sand inside the direct shear box during a geotechnical test. Numerical calculations were performed with open-source discrete code YADE. The full 3D model was used, in order to eliminate some non-physical phenomena. The numerical stress-strain curve was directly compared with the laboratory results and good agreement was obtained. The focus was on the shape of the localized zone, the properties of this zone and its behaviour. The movement of the individual grains was studied. In our analysis, the stresses were also taken into consideration. The conclusions were validated on tests with different initial void ratio (dense or loose material) and with different vertical pressure. |
| Databáze: | OpenAIRE |
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