Micro-mechanical analysis on the onset of erosion in granular materials

Harshani, H. M. D., Galindo-Torres, S. A., Scheuermann, A. and Muhlhaus, H. B. (2015) Micro-mechanical analysis on the onset of erosion in granular materials. Philosophical Magazine, 95 28-30: 3146-3166. doi:10.1080/14786435.2015.1049237

Author Harshani, H. M. D.
Galindo-Torres, S. A.
Scheuermann, A.
Muhlhaus, H. B.
Title Micro-mechanical analysis on the onset of erosion in granular materials
Journal name Philosophical Magazine   Check publisher's open access policy
ISSN 1478-6443
Publication date 2015-07-06
Sub-type Article (original research)
DOI 10.1080/14786435.2015.1049237
Volume 95
Issue 28-30
Start page 3146
End page 3166
Total pages 21
Place of publication Abingdon, Oxfordshire United Kingdom
Publisher Taylor & Francis
Collection year 2016
Language eng
Abstract The onset of internal erosion is a particle level phenomenon, and therefore, a numerical model capable of tracking the behaviour of particles at micro-scale is needed to exemplify most of the critical variables involved in the process. In this paper, a three-dimensional fully coupled fluid–solid model was utilized to explore the initiation of erosion. Particles were modelled on a micro-scale using the discrete element method (DEM), while the fluid was modelled at a meso-scale using the lattice Boltzmann method (LBM). Fluid was passed through a solid matrix in an opposing direction to gravity with the pore water pressure controlled in stepwise stages until internal erosion or bulk movement of the particles developed and progressed. The model was validated through experimental results found in the literature. Once validated, particle fluid properties were analyzed for the onset of erosion. Determination of a critical hydraulic gradient was obtained from the modelled scenario, which gave clear evidence that the coupled DEM-LBM scheme is a very effective tool for studying internal erosion phenomena in water retaining structures.
Keyword Piping erosion
Lattice Boltzmann method (LBM)
Discrete element method (DEM)
Critical hydraulic gradient
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online 6 July 2015.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
School of Civil Engineering Publications
Official 2016 Collection
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