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Article: Development of neutral plane on a pile in a consolidating ground

TitleDevelopment of neutral plane on a pile in a consolidating ground
Authors
KeywordsConsolidation
Negative skin friction
Neutral plane
Pile
Issue Date2010
PublisherSpringer New York LLC
Citation
Aip Conference Proceedings, 2010, v. 1233 PART 1, p. 1594-1599 How to Cite?
AbstractWhen a pile is installed in a layer of soft and compressible soil, the pile would be subjected to skin friction as the consequence of the relative settlements between the soil and the pile. Negative skin friction (NSF) is mobilized when soil settles more than the pile while positive skin friction (PSF) occurs vice versa. The location where NSF changes to PSF is called the neutral plane which is also the position where the relative movement is zero. This paper presents the results of a series of axis-symmetric coupled-consolidation finite element modeling of a wish-in-place pile embedded in a consolidating ground. Geometric non-linearity technique is adopted and the pile-soil interface is assumed to follow a bi-linear Coulomb type frictional behavior. Attempts have been made to study the effects of the soil's compressibility, pile head loading and pile end-bearing type on the development of skin friction and neutral plane with time. It is found that NSF is fully mobilized near the ground surface. In the case of floating piles, the neutral plane locates at about 65% of the pile embedment length in long term regardless the soil's compressibility. The plane moves upward when a pile head loading is applied. The amount of dragload can be substantial compared to the pile head loading. 90% of the neutral plane's final position is reached when only 50% average degree of consolidation is complete, regardless the soil's compressibility and the magnitude of pile head load. For fixed-end piles, neutral plane always locates at the pile toe in long term. However, the position is not reached instantly when surcharge is placed in the case of loaded piles. © 2010 American Institute of Physics.
Persistent Identifierhttp://hdl.handle.net/10722/91197
ISSN
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSun, TKen_HK
dc.contributor.authorYan, WMen_HK
dc.date.accessioned2010-09-17T10:14:44Z-
dc.date.available2010-09-17T10:14:44Z-
dc.date.issued2010en_HK
dc.identifier.citationAip Conference Proceedings, 2010, v. 1233 PART 1, p. 1594-1599en_HK
dc.identifier.issn0094-243Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/91197-
dc.description.abstractWhen a pile is installed in a layer of soft and compressible soil, the pile would be subjected to skin friction as the consequence of the relative settlements between the soil and the pile. Negative skin friction (NSF) is mobilized when soil settles more than the pile while positive skin friction (PSF) occurs vice versa. The location where NSF changes to PSF is called the neutral plane which is also the position where the relative movement is zero. This paper presents the results of a series of axis-symmetric coupled-consolidation finite element modeling of a wish-in-place pile embedded in a consolidating ground. Geometric non-linearity technique is adopted and the pile-soil interface is assumed to follow a bi-linear Coulomb type frictional behavior. Attempts have been made to study the effects of the soil's compressibility, pile head loading and pile end-bearing type on the development of skin friction and neutral plane with time. It is found that NSF is fully mobilized near the ground surface. In the case of floating piles, the neutral plane locates at about 65% of the pile embedment length in long term regardless the soil's compressibility. The plane moves upward when a pile head loading is applied. The amount of dragload can be substantial compared to the pile head loading. 90% of the neutral plane's final position is reached when only 50% average degree of consolidation is complete, regardless the soil's compressibility and the magnitude of pile head load. For fixed-end piles, neutral plane always locates at the pile toe in long term. However, the position is not reached instantly when surcharge is placed in the case of loaded piles. © 2010 American Institute of Physics.en_HK
dc.languageengen_HK
dc.publisherSpringer New York LLCen_HK
dc.relation.ispartofAIP Conference Proceedingsen_HK
dc.subjectConsolidationen_HK
dc.subjectNegative skin frictionen_HK
dc.subjectNeutral planeen_HK
dc.subjectPileen_HK
dc.titleDevelopment of neutral plane on a pile in a consolidating grounden_HK
dc.typeArticleen_HK
dc.identifier.emailYan, WM:ryanyan@hku.hken_HK
dc.identifier.authorityYan, WM=rp01400en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1063/1.3452147en_HK
dc.identifier.scopuseid_2-s2.0-77955730176en_HK
dc.identifier.hkuros171063-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77955730176&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume1233en_HK
dc.identifier.issuePART 1en_HK
dc.identifier.spage1594en_HK
dc.identifier.epage1599en_HK
dc.identifier.eissn1551-7616-
dc.identifier.isiWOS:000283003800272-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridSun, TK=36350090700en_HK
dc.identifier.scopusauthoridYan, WM=35369531200en_HK

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