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A multiscale DEM-LBM analysis on permeability evolutions inside a dilatant shear band
Abstract This paper presents a multiscale analysis of a dilatant shear band using a three-dimensional discrete element method and a lattice Boltzmann/finite element hybrid scheme. In particular, three-dimensional simple shear tests are conducted via the discrete element method. A spatial homogenization is performed to recover the macroscopic stress from the micro-mechanical force chains. The pore geometries of the shear band and host matrix are quantitatively evaluated through morphology analyses and lattice Boltzmann/finite element flow simulations. Results from the discrete element simulations imply that grain sliding and rotation occur predominately with the shear band. These granular motions lead to dilation of pore space inside the shear band and increases in local permeability. While considerable anisotropy in the contact fabric is observed with the shear band, anisotropy of the permeability is, at most, modest in the assemblies composed of spherical grains.
A multiscale DEM-LBM analysis on permeability evolutions inside a dilatant shear band
Abstract This paper presents a multiscale analysis of a dilatant shear band using a three-dimensional discrete element method and a lattice Boltzmann/finite element hybrid scheme. In particular, three-dimensional simple shear tests are conducted via the discrete element method. A spatial homogenization is performed to recover the macroscopic stress from the micro-mechanical force chains. The pore geometries of the shear band and host matrix are quantitatively evaluated through morphology analyses and lattice Boltzmann/finite element flow simulations. Results from the discrete element simulations imply that grain sliding and rotation occur predominately with the shear band. These granular motions lead to dilation of pore space inside the shear band and increases in local permeability. While considerable anisotropy in the contact fabric is observed with the shear band, anisotropy of the permeability is, at most, modest in the assemblies composed of spherical grains.
A multiscale DEM-LBM analysis on permeability evolutions inside a dilatant shear band
Sun, WaiChing (author) / Kuhn, Matthew R. (author) / Rudnicki, John W. (author)
Acta Geotechnica ; 8 ; 465-480
2013-05-31
16 pages
Article (Journal)
Electronic Resource
English
Discrete element method , Homogenization , Lattice Boltzmann method , Micromechanics of granular materials , Microstructure , Strain localization Engineering , Geoengineering, Foundations, Hydraulics , Continuum Mechanics and Mechanics of Materials , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics , Structural Mechanics
A multiscale DEM-LBM analysis on permeability evolutions inside a dilatant shear band
| Springer Verlag | 2013
A multiscale DEM-LBM analysis on permeability evolutions inside a dilatant shear band
| Online Contents | 2013
A multiscale DEM-LBM analysis on permeability evolutions inside a dilatant shear band
| British Library Online Contents | 2013
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