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Poisson's ratio of granular materials for Mohr-Coulomb elastoplastic model.
- Source :
- International Journal of Mining, Reclamation & Environment; Dec2023, Vol. 37 Issue 10, p780-804, 25p
- Publication Year :
- 2023
-
Abstract
- The Mohr-Coulomb elastoplastic model is extensively employed in geotechnical engineering. Despite the well-known nonlinear behaviour of granular cohesionless materials under a wide range of normal stress or confining pressure, the Mohr-Coulomb elastoplastic model continues to be largely used in geotechnical engineering, due to its simplicity and large availability in numerous commercialised software. Its application requires the input of a key parameter, named Poisson's ratio. It is however a big challenge as its value changes with axial strain and confining pressure. In this study, the optimal Poisson's ratio of granular materials for the Mohr-Coulomb elastoplastic model is determined by reproducing the experimental results of stress-strain relationships through numerical modelling with the Mohr-Coulomb elastoplastic model. The results show that the Poisson's ratio μ<subscript>0.02</subscript>, corresponding to the slope of the volumetric strain against axial strain curve at 2% of the peak deviatoric stress can be used in numerical modelling with the Mohr-Coulomb elastoplastic model as long as the granular material does not exhibit dilation behaviour. When the material exhibits dilation behaviour, the Poisson's ratio μ<subscript>0.36</subscript>, corresponding to the slope of the volumetric strain against axial strain curve at 36% of the peak deviatoric stress, seems to be appropriate in numerical modelling with the Mohr-Coulomb elastoplastic model. In addition, the study also shows that the Mohr-Coulomb elastoplastic model can be used to simulate mechanical behaviour of granular material under small strain, but not appropriate under large strain conditions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17480930
- Volume :
- 37
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- International Journal of Mining, Reclamation & Environment
- Publication Type :
- Academic Journal
- Accession number :
- 174466560
- Full Text :
- https://doi.org/10.1080/17480930.2023.2260589