Numerical investigation of the instability of dry granular bed induced by water leakage

Nguyen, NHT; Nguyen, TT

Numerical investigation of the instability of dry granular bed induced by water leakage

Nguyen, NHT Nguyen, TT

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Publisher:: SPRINGER HEIDELBERG
Publication Type:: Journal Article
Citation:: Acta Geotechnica, 2024
Issue Date:: 2024-01-01

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Field	Value	Language
dc.contributor.author	Nguyen, NHT
dc.contributor.author	Nguyen, TT
dc.date.accessioned	2024-03-18T01:09:45Z
dc.date.available	2024-03-18T01:09:45Z
dc.date.issued	2024-01-01
dc.identifier.citation	Acta Geotechnica, 2024
dc.identifier.issn	1861-1125
dc.identifier.issn	1861-1133
dc.identifier.uri	http://hdl.handle.net/10453/176836
dc.description.abstract	Underground pipe defects or cracks under transport infrastructure can cause water leakage to upper soil layers (e.g. subgrade and capping), inducing local cavities or even failure of overlying road/railway formation. Although numerous studies on the instability of granular beds induced by injected water have been conducted, most of them focused on the behaviour of saturated granular beds, while research on dry granular beds is still limited. This paper aims to address this gap using a numerical model coupling volume of fluid method with discrete element method. We observed that dry granular beds go through three distinct regimes as water jet velocity increases including stationary, stable deformation with heave and fluidisation. However, the flow velocities required to deform and fluidise dry granular beds are significantly higher than those required for saturated beds. Increasing granular bed thickness can alter its failure mechanism from full depth to localised erosion, leading to cavity formation around pipe cracks prior to the bed fluidisation. The gravitational and frictional components of granular mass are identified as two main resisting forces of dry granular beds against water jet force, evidenced by the increase of critical jet velocities as particle density and friction coefficient increase. Nevertheless, the moblised zone of granular mass is practically independent of both the buried depth of dry granular beds.
dc.language	English
dc.publisher	SPRINGER HEIDELBERG
dc.relation.ispartof	Acta Geotechnica
dc.relation.isbasedon	10.1007/s11440-023-02204-9
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.subject.classification	4005 Civil engineering
dc.subject.classification	4019 Resources engineering and extractive metallurgy
dc.title	Numerical investigation of the instability of dry granular bed induced by water leakage
dc.type	Journal Article
utslib.for	0905 Civil Engineering
pubs.organisational-group	University of Technology Sydney
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
utslib.copyright.status	open_access	*
dc.date.updated	2024-03-18T01:09:42Z
pubs.publication-status	Published

Abstract:

Underground pipe defects or cracks under transport infrastructure can cause water leakage to upper soil layers (e.g. subgrade and capping), inducing local cavities or even failure of overlying road/railway formation. Although numerous studies on the instability of granular beds induced by injected water have been conducted, most of them focused on the behaviour of saturated granular beds, while research on dry granular beds is still limited. This paper aims to address this gap using a numerical model coupling volume of fluid method with discrete element method. We observed that dry granular beds go through three distinct regimes as water jet velocity increases including stationary, stable deformation with heave and fluidisation. However, the flow velocities required to deform and fluidise dry granular beds are significantly higher than those required for saturated beds. Increasing granular bed thickness can alter its failure mechanism from full depth to localised erosion, leading to cavity formation around pipe cracks prior to the bed fluidisation. The gravitational and frictional components of granular mass are identified as two main resisting forces of dry granular beds against water jet force, evidenced by the increase of critical jet velocities as particle density and friction coefficient increase. Nevertheless, the moblised zone of granular mass is practically independent of both the buried depth of dry granular beds.

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http://hdl.handle.net/10453/176836