From Particles to Constrictions: Scientific Evolution of Enhanced Criteria for Internal Stability Assessment of Soils

Indraratna, B; Israr, J; Vaughan, LPR

From Particles to Constrictions: Scientific Evolution of Enhanced Criteria for Internal Stability Assessment of Soils

Indraratna, B

Israr, J Vaughan, LPR

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Publisher:: http://www.seags.ait.ac.th/ The SEAGS & AGSSEA Journal Team Southeast Asian Geotechnical Society c/o Asian Institute of Technology Room N116, SET Building P.O. Box 4, Klong Luang, Pathumthani 12120 Thailand
Publication Type:: Journal Article
Citation:: Geotechnical Engineering, 2020, 51, (3), pp. 65-72
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Indraratna, B https://orcid.org/0000-0002-9057-1514
dc.contributor.author	Israr, J
dc.contributor.author	Vaughan, LPR
dc.date.accessioned	2021-02-26T05:10:14Z
dc.date.available	2021-02-26T05:10:14Z
dc.date.issued	2020-01-01
dc.identifier.citation	Geotechnical Engineering, 2020, 51, (3), pp. 65-72
dc.identifier.issn	0046-5828
dc.identifier.uri	http://hdl.handle.net/10453/146485
dc.description.abstract	© 2020 Southeast Asian Geotechnical Society. All rights reserved. Internal instability occurs when steady seepage forces erode the finer fractions from non-uniform soils along pre-existing openings such as cracks in cohesive soils and voids in non-cohesive soil to induce permanent changes in the original particle size distribution. Given that the drainage characteristics of soils are significantly influenced by the shape, packing arrangement, compaction, and size distribution of their particles, even limited erosion can markedly alter their drainage characteristics. The geometrical assessment of internal instability potential is normally conducted using classical filter retention criterion based on mere particle size distribution and without giving due consideration to the above factors. These methods would determine the risk of instability by approximating the soil’s constrictions based on its particle size distribution; these constrictions are pore channels connecting neighbouring void spaces that would control both permeability and retention phenomena. However, recent advances in mathematical computations have facilitated the exact delineation of constriction sizes and the introduction of more accurate constriction based methods. This study purports to shed light on the scientific evolution of particle and constriction based methods over the past four decades, including the enhanced accuracy, reduced bias, and robustness associated with the latter. An interesting case study from our experience of using these approaches for a permeable barrier design at Bomaderry, NSW (Australia) for subsurface flow treatment is presented, and recommendations for their use by practicing engineers are made to conclude this study.
dc.language	en
dc.publisher	http://www.seags.ait.ac.th/ The SEAGS & AGSSEA Journal Team Southeast Asian Geotechnical Society c/o Asian Institute of Technology Room N116, SET Building P.O. Box 4, Klong Luang, Pathumthani 12120 Thailand
dc.relation.ispartof	Geotechnical Engineering
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	Geological & Geomatics Engineering
dc.title	From Particles to Constrictions: Scientific Evolution of Enhanced Criteria for Internal Stability Assessment of Soils
dc.type	Journal Article
utslib.citation.volume	51
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	*
dc.date.updated	2021-02-26T05:10:13Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	51
utslib.citation.issue	3

Abstract:

© 2020 Southeast Asian Geotechnical Society. All rights reserved. Internal instability occurs when steady seepage forces erode the finer fractions from non-uniform soils along pre-existing openings such as cracks in cohesive soils and voids in non-cohesive soil to induce permanent changes in the original particle size distribution. Given that the drainage characteristics of soils are significantly influenced by the shape, packing arrangement, compaction, and size distribution of their particles, even limited erosion can markedly alter their drainage characteristics. The geometrical assessment of internal instability potential is normally conducted using classical filter retention criterion based on mere particle size distribution and without giving due consideration to the above factors. These methods would determine the risk of instability by approximating the soil’s constrictions based on its particle size distribution; these constrictions are pore channels connecting neighbouring void spaces that would control both permeability and retention phenomena. However, recent advances in mathematical computations have facilitated the exact delineation of constriction sizes and the introduction of more accurate constriction based methods. This study purports to shed light on the scientific evolution of particle and constriction based methods over the past four decades, including the enhanced accuracy, reduced bias, and robustness associated with the latter. An interesting case study from our experience of using these approaches for a permeable barrier design at Bomaderry, NSW (Australia) for subsurface flow treatment is presented, and recommendations for their use by practicing engineers are made to conclude this study.

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http://hdl.handle.net/10453/146485