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Equivalent state theory for sand with non-plastic fine mixtures: A DEM investigation
File(s)
Author(s)
Barnett, N
Rahman, MM
Karim, MR
Nguyen, HBK
Harb Carraro, Joao Antonio
Type
Journal Article
Abstract
DEM was used to simulate constant volume (undrained) triaxial compression tests for coarse particles (sand) mixed with non-plastic fines. The fines content (fc) of the mixtures tested was kept equal to 0, 0.05, 0.10 or 0.20. Accordingly, the critical state and micromechanical responses of these mixtures were evaluated. A focus on the influence of fc on sand behaviour was captured when fc<fthre, where fthre represents a threshold fines content, which corresponds to a transition between a fines-in-sand soil matrix to a sand-in-fines soil matrix. DEM was utilised to assess the micromechanical participation of fine particles within the sand skeleton (matrix). Such evaluations led to assessing the performance of the equivalent granular void ratio (e*), the equivalent granular state parameter (􀁜*), and ultimately their inherent parameter b, which represents the proportion of fines actively participating in the sand skeleton structure. It was observed that through capturing the stress partition of contact types within granular mixtures, a reasonable approximation of the active proportion of contacts within the sand matrix could be obtained leading to a DEM interpretation of the b parameter. The study therefore evaluated the concept and applicability of the equivalent state theory for sand-fines mixtures.
Date Issued
2021-05
Date Acceptance
2020-01-14
Citation
Geotechnique, 2021, 71 (5), pp.423-440
URI
URL
DOI
ISSN
0016-8505
Publisher
Thomas Telford (ICE Publishing)
Start Page
423
End Page
440
Journal / Book Title
Geotechnique
Volume
71
Issue
5
Copyright Statement
© ICE Publishing, all rights reserved.
Identifier
https://www.icevirtuallibrary.com/doi/10.1680/jgeot.19.P.103
Subjects
Geological & Geomatics Engineering
0905 Civil Engineering
0907 Environmental Engineering
0914 Resources Engineering and Extractive Metallurgy
Publication Status
Published
Date Publish Online
2020-12-14