The role of particle shape on hydraulic conductivity of granular soils captured through Kozeny-Carman approach

Nguyen, TT; Indraratna, B

The role of particle shape on hydraulic conductivity of granular soils captured through Kozeny-Carman approach

Nguyen, TT Indraratna, B

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Publisher:: Thomas Telford Ltd.
Publication Type:: Journal Article
Citation:: Geotechnique Letters, 2020, 10, (3), pp. 398-403
Issue Date:: 2020-09-01

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Field	Value	Language
dc.contributor.author	Nguyen, TT
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.date.accessioned	2020-12-24T05:33:10Z
dc.date.available	2020-12-24T05:33:10Z
dc.date.issued	2020-09-01
dc.identifier.citation	Geotechnique Letters, 2020, 10, (3), pp. 398-403
dc.identifier.issn	2045-2543
dc.identifier.issn	2045-2543
dc.identifier.uri	http://hdl.handle.net/10453/144948
dc.description.abstract	© 2020 ICE Publishing: all rights reserved. Previous studies indicate that particle shape plays an important role in the hydraulic conductivity (k) of granular materials, often represented through the Kozeny-Carman (KC) concept. Several recent studies have improved the accuracy of the KC approach using the particle-size distribution (PSD) to estimate the specific surface area of particles but overly simplifying the effect of particle shape. This current study innovatively adopts the micro-computed tomography technique to compute particle shape parameters of different granular materials (e.g. glass beads, sand and crushed gravel) and then incorporate these parameters into the KC equation to estimate k more accurately, which is then validated with experimental data. The results indicate that k varies significantly according to different particle shapes even if the same mean porosity and PSD are retained. Particles that are less spherical and rounded have a larger fluid-particle contact area (i.e. larger shape factor), hence a smaller hydraulic conductivity. The study suggests a shape factor of 1·28-1·52 for natural sand and 1·84-2·1 for crushed sand and gravel can be used for KC method to estimate k while a porosity-dependent equation is proposed to estimate the tortuosity for different shaped materials.
dc.language	en
dc.publisher	Thomas Telford Ltd.
dc.relation	http://purl.org/au-research/grants/arc/LP160101254
dc.relation.ispartof	Geotechnique Letters
dc.relation.isbasedon	10.1680/jgele.20.00032
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0403 Geology, 0905 Civil Engineering, 0909 Geomatic Engineering
dc.title	The role of particle shape on hydraulic conductivity of granular soils captured through Kozeny-Carman approach
dc.type	Journal Article
utslib.citation.volume	10
utslib.for	0403 Geology
utslib.for	0905 Civil Engineering
utslib.for	0909 Geomatic Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2021-09-01T00:00:00+1000Z
dc.date.updated	2020-12-24T05:32:55Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	10
utslib.citation.issue	3

Abstract:

© 2020 ICE Publishing: all rights reserved. Previous studies indicate that particle shape plays an important role in the hydraulic conductivity (k) of granular materials, often represented through the Kozeny-Carman (KC) concept. Several recent studies have improved the accuracy of the KC approach using the particle-size distribution (PSD) to estimate the specific surface area of particles but overly simplifying the effect of particle shape. This current study innovatively adopts the micro-computed tomography technique to compute particle shape parameters of different granular materials (e.g. glass beads, sand and crushed gravel) and then incorporate these parameters into the KC equation to estimate k more accurately, which is then validated with experimental data. The results indicate that k varies significantly according to different particle shapes even if the same mean porosity and PSD are retained. Particles that are less spherical and rounded have a larger fluid-particle contact area (i.e. larger shape factor), hence a smaller hydraulic conductivity. The study suggests a shape factor of 1·28-1·52 for natural sand and 1·84-2·1 for crushed sand and gravel can be used for KC method to estimate k while a porosity-dependent equation is proposed to estimate the tortuosity for different shaped materials.

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http://hdl.handle.net/10453/144948