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Article: Predicting uplift resistance of deep piles with enlarged bases

TitlePredicting uplift resistance of deep piles with enlarged bases
Authors
KeywordsFoundations
Mathematical modelling
Piles & Piling
Issue Date2009
PublisherThomas Telford Ltd.
Citation
Proceedings Of The Institution Of Civil Engineers: Geotechnical Engineering, 2009, v. 162 n. 4, p. 225-238 How to Cite?
AbstractA theoretical method is presented for predicting the uplift resistance of deep piles with enlarged bases. The piles are deeply embedded in soil, so that an axisymmetric logarithmic-spiral (or 'peach-shaped') slip surface in the soil around the pile is buried underground throughout the uplifting process. The uplift resistance is considered to be equal to the sum of the pile shaft and base uplift resistance as well as the pile weight. The pile shaft and base uplift resistance were derived from the unit skin frictional resistance model and the peachshaped slip surface model in the soil around the base. The equations associated with the proposed theoretical method are analytically formulated using the classical limit equilibrium method and the axisymmetric pile uplift model. Three base uplift resistance capacity factors, Nc, Nq and Nγ, were obtained, corresponding to the effects of cohesion, surcharge and self-weight respectively. Charts of these three factors are presented at the serviceability failure limit (defined as pile upward displacement equal to 10% of the pile shaft diameter). The proposed theoretical method is then validated with results from full-scale field tests. It is shown that the proposed theoretical method can effectively estimate the uplift resistance capacity at the serviceability failure limit for deep piles with enlarged bases in various soils.
Persistent Identifierhttp://hdl.handle.net/10722/124591
ISSN
2015 Impact Factor: 0.577
2015 SCImago Journal Rankings: 0.697
ISI Accession Number ID
Funding AgencyGrant Number
Council of Hong Kong SAR Government
Hong Kong Jockey Club Charities Trust
Funding Information:

The authors are grateful for the financial support provided by the Research Grants Council of Hong Kong SAR Government and the Hong Kong Jockey Club Charities Trust.

References

 

DC FieldValueLanguage
dc.contributor.authorXu, HFen_HK
dc.contributor.authorYue, ZQen_HK
dc.contributor.authorQian, QHen_HK
dc.date.accessioned2010-10-31T10:43:01Z-
dc.date.available2010-10-31T10:43:01Z-
dc.date.issued2009en_HK
dc.identifier.citationProceedings Of The Institution Of Civil Engineers: Geotechnical Engineering, 2009, v. 162 n. 4, p. 225-238en_HK
dc.identifier.issn1353-2618en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124591-
dc.description.abstractA theoretical method is presented for predicting the uplift resistance of deep piles with enlarged bases. The piles are deeply embedded in soil, so that an axisymmetric logarithmic-spiral (or 'peach-shaped') slip surface in the soil around the pile is buried underground throughout the uplifting process. The uplift resistance is considered to be equal to the sum of the pile shaft and base uplift resistance as well as the pile weight. The pile shaft and base uplift resistance were derived from the unit skin frictional resistance model and the peachshaped slip surface model in the soil around the base. The equations associated with the proposed theoretical method are analytically formulated using the classical limit equilibrium method and the axisymmetric pile uplift model. Three base uplift resistance capacity factors, Nc, Nq and Nγ, were obtained, corresponding to the effects of cohesion, surcharge and self-weight respectively. Charts of these three factors are presented at the serviceability failure limit (defined as pile upward displacement equal to 10% of the pile shaft diameter). The proposed theoretical method is then validated with results from full-scale field tests. It is shown that the proposed theoretical method can effectively estimate the uplift resistance capacity at the serviceability failure limit for deep piles with enlarged bases in various soils.en_HK
dc.languageengen_HK
dc.publisherThomas Telford Ltd.-
dc.relation.ispartofProceedings of the Institution of Civil Engineers: Geotechnical Engineeringen_HK
dc.subjectFoundationsen_HK
dc.subjectMathematical modellingen_HK
dc.subjectPiles & Pilingen_HK
dc.titlePredicting uplift resistance of deep piles with enlarged basesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1353-2618&volume=162&issue=4&spage=225&epage=238&date=2009&atitle=Predicting+uplift+resistance+of+deep+piles+with+enlarged+bases-
dc.identifier.emailYue, ZQ:yueqzq@hkucc.hku.hken_HK
dc.identifier.authorityYue, ZQ=rp00209en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1680/geng.2009.162.4.225en_HK
dc.identifier.scopuseid_2-s2.0-77956233487en_HK
dc.identifier.hkuros179405en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77956233487&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume162en_HK
dc.identifier.issue4en_HK
dc.identifier.spage225en_HK
dc.identifier.epage238en_HK
dc.identifier.eissn1751-8563-
dc.identifier.isiWOS:000270302800005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridXu, HF=8708519900en_HK
dc.identifier.scopusauthoridYue, ZQ=7102782735en_HK
dc.identifier.scopusauthoridQian, QH=7102168548en_HK

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