Title

A multiscale DEM-LBM analysis on permeability evolutions inside a dilatant shear band

Journal Title

Acta Geotechnica

Publication Date

10-2013

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.

Author Supplied Keywords

Discrete element method, Homogenization, Lattice Boltzmann method, Micromechanics of granular materials, Microstructure, Strain localization

Subjects

Anisotropy--Analysis; Permeability -- Analysis; Textiles -- Analysis

Publication Information

Acta Geotechnica, 2013, Volume 8, Issue 5, 465-480.

© 2013 Acta Geotechnica, Springer

Linked version is the final published version.

DOI

10.1007/s11440-013-0210-2

Peer-Reviewed

Yes

Document Type

Journal Article

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Published Version

(Available to UP community as permitted)

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