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Lookup NU author(s): Vasileios Angelidakis, Dr Sadegh NadimiORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
This contribution provides high fidelity images of real granular materials with the aid of X-ray micro computed tomography (μCT ), and employs a multi-sphere approximation to reconstruct non-spherical particles. Through the discrete element method (DEM) simulations on granular samples composed of these non-spherical clumps, the effect of particle shape on the macroscopic mechanical response and microscopic soil fabric evolution is examined for sheared soil assemblies under triaxial loading conditions. Simulation results indicate that materials with more irregular particles tend to show higher shear resistance in both peak and critical stresses, while more sphere-like materials tend to exhibit lower void ratio and mean coordination number values under isotropic loading conditions and in the critical state. The proposed critical state parameters for describing the sensitivity of the mean coordination number to confining pressures are larger as particles become more irregular. At a microscopic level of observation, more irregular materials appear to exhibit higher fabric anisotropy in terms of contact normal and particle orientation in the critical state. The critical stress ratio determined through experimental and simulation results are found to be linearly linked to the shape-weighted fabric anisotropy index.
Author(s): Li Y, Otsubo M, Angelidakis V, Kuwano R, Nadimi S
Publication type: Article
Publication status: Published
Journal: Géotechnique
Year: 2024
Pages: epub ahead of print
Online publication date: 31/03/2024
Acceptance date: 07/02/2024
Date deposited: 02/04/2024
ISSN (print): 0016-8505
ISSN (electronic): 1751-7656
Publisher: Emerald Publishing
URL: https://doi.org/10.1680/jgeot.23.00162
DOI: 10.1680/jgeot.23.00162
ePrints DOI: 10.57711/bens-2005
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