Pumping effect of rainfall-induced excess pore pressure on particle migration

Gao, F; He, X; Zhang, S

Pumping effect of rainfall-induced excess pore pressure on particle migration

Gao, F He, X

Zhang, S

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Transportation Geotechnics, 2021, 31
Issue Date:: 2021-11-01

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Field	Value	Language
dc.contributor.author	Gao, F
dc.contributor.author	He, X https://orcid.org/0000-0001-5336-3663
dc.contributor.author	Zhang, S
dc.date.accessioned	2022-05-22T21:59:01Z
dc.date.available	2022-05-22T21:59:01Z
dc.date.issued	2021-11-01
dc.identifier.citation	Transportation Geotechnics, 2021, 31
dc.identifier.issn	2214-3912
dc.identifier.issn	2214-3912
dc.identifier.uri	http://hdl.handle.net/10453/157599
dc.description.abstract	Mud pumping in rail embankments has been observed in rainy seasons. In this study, a layered gravel-silt column was tested under cyclic loading to investigate the mud pumping mechanism caused by rainfall. The results show that liquid sloshing is more violent (larger velocity and wave height) with the water level higher. The pumping effect of sloshing-induced excess pore pressure leads to seepage in the sandy silt, and this seepage causes fine particles to detach from the skeleton particle surface. The size composition of migrating particles includes three orders of magnitude, which challenges the reliability of current numerical simulations in mud pumping. The uplift force and drag force of particles gradually increase as the water level rises, and the effects of uplift force on particle detachment exceed that of drag force. The evolution of slurry turbidity indicates that there is a water level threshold in the gravel layer, and a water level above the threshold will significantly promote the rate and extent of particle migration. The stability of particles under the pumping effect depends on the difference between hydrodynamic force and resistance. The findings from this study can help understand the engineering implications of waterproof and drainage systems in rail embankments to prevent the pumping effect.
dc.language	English
dc.publisher	Elsevier
dc.relation.ispartof	Transportation Geotechnics
dc.relation.isbasedon	10.1016/j.trgeo.2021.100669
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering
dc.title	Pumping effect of rainfall-induced excess pore pressure on particle migration
dc.type	Journal Article
utslib.citation.volume	31
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	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-05-22T21:58:56Z
pubs.publication-status	Published
pubs.volume	31

Abstract:

Mud pumping in rail embankments has been observed in rainy seasons. In this study, a layered gravel-silt column was tested under cyclic loading to investigate the mud pumping mechanism caused by rainfall. The results show that liquid sloshing is more violent (larger velocity and wave height) with the water level higher. The pumping effect of sloshing-induced excess pore pressure leads to seepage in the sandy silt, and this seepage causes fine particles to detach from the skeleton particle surface. The size composition of migrating particles includes three orders of magnitude, which challenges the reliability of current numerical simulations in mud pumping. The uplift force and drag force of particles gradually increase as the water level rises, and the effects of uplift force on particle detachment exceed that of drag force. The evolution of slurry turbidity indicates that there is a water level threshold in the gravel layer, and a water level above the threshold will significantly promote the rate and extent of particle migration. The stability of particles under the pumping effect depends on the difference between hydrodynamic force and resistance. The findings from this study can help understand the engineering implications of waterproof and drainage systems in rail embankments to prevent the pumping effect.

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http://hdl.handle.net/10453/157599