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Article: Determination of bearing capacity of shallow foundations without using superposition approximation

TitleDetermination of bearing capacity of shallow foundations without using superposition approximation
Authors
KeywordsCritical slip field
Shallow foundation
Strip footing
Ultimate bearing capacity
Issue Date2003
PublisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgj
Citation
Canadian Geotechnical Journal, 2003, v. 40 n. 2, p. 450-459 How to Cite?
AbstractThe Terzaghi superposition assumption has been widely used to determine the bearing capacity of shallow footings. Although this assumption always errs on the safe side, a rigorous procedure to calculate the bearing capacity is still of engineering value. This paper presents such a procedure that is free from errors as a result of the superposition assumption. It demonstrates that the ultimate bearing capacity can be precisely expressed by the Terzaghi equation, except that the bearing capacity factor N y is dependent upon the surcharge ratio. A recently developed numerical method, i.e., the critical slip field method, is used to calculate the modification coefficient for modifying N y It is found that this modification coefficient increases with the surcharge ratio at small values of surcharge ratio and then remains constant for large values of surcharge ratio. However, the errors invoked by the superposition assumption do not exceed 10%. On the basis of numerical calculations, a simple closed-form expression of the modification coefficient is proposed that yields the theoretically rigorous ultimate bearing capacity. In the later part of the paper, errors in bearing capacity calculations owing to the use of conventional procedures are analyzed. It is concluded that the continued use of conventional procedures is justified, but the inherent errors should not be neglected in assessing the performance of shallow foundations.
Persistent Identifierhttp://hdl.handle.net/10722/42069
ISSN
2015 Impact Factor: 1.877
2015 SCImago Journal Rankings: 2.093
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhu, DYen_HK
dc.contributor.authorLee, CFen_HK
dc.contributor.authorLaw, KTen_HK
dc.date.accessioned2007-01-08T02:28:10Z-
dc.date.available2007-01-08T02:28:10Z-
dc.date.issued2003en_HK
dc.identifier.citationCanadian Geotechnical Journal, 2003, v. 40 n. 2, p. 450-459en_HK
dc.identifier.issn0008-3674en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42069-
dc.description.abstractThe Terzaghi superposition assumption has been widely used to determine the bearing capacity of shallow footings. Although this assumption always errs on the safe side, a rigorous procedure to calculate the bearing capacity is still of engineering value. This paper presents such a procedure that is free from errors as a result of the superposition assumption. It demonstrates that the ultimate bearing capacity can be precisely expressed by the Terzaghi equation, except that the bearing capacity factor N y is dependent upon the surcharge ratio. A recently developed numerical method, i.e., the critical slip field method, is used to calculate the modification coefficient for modifying N y It is found that this modification coefficient increases with the surcharge ratio at small values of surcharge ratio and then remains constant for large values of surcharge ratio. However, the errors invoked by the superposition assumption do not exceed 10%. On the basis of numerical calculations, a simple closed-form expression of the modification coefficient is proposed that yields the theoretically rigorous ultimate bearing capacity. In the later part of the paper, errors in bearing capacity calculations owing to the use of conventional procedures are analyzed. It is concluded that the continued use of conventional procedures is justified, but the inherent errors should not be neglected in assessing the performance of shallow foundations.en_HK
dc.format.extent1073583 bytes-
dc.format.extent4105 bytes-
dc.format.extent4105 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypetext/plain-
dc.format.mimetypetext/plain-
dc.languageengen_HK
dc.publisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgjen_HK
dc.relation.ispartofCanadian Geotechnical Journalen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsCanadian Geotechnical Journal. Copyright © N R C Research Press.en_HK
dc.subjectCritical slip fielden_HK
dc.subjectShallow foundationen_HK
dc.subjectStrip footingen_HK
dc.subjectUltimate bearing capacityen_HK
dc.titleDetermination of bearing capacity of shallow foundations without using superposition approximationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0008-3674&volume=40&issue=2&spage=450&epage=459&date=2003&atitle=Determination+of+bearing+capacity+of+shallow+foundations+without+using+superposition+approximationen_HK
dc.identifier.emailLee, CF: leecf@hkucc.hku.hken_HK
dc.identifier.authorityLee, CF=rp00139en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1139/t02-105en_HK
dc.identifier.scopuseid_2-s2.0-0038419524en_HK
dc.identifier.hkuros82462-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0038419524&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume40en_HK
dc.identifier.issue2en_HK
dc.identifier.spage450en_HK
dc.identifier.epage459en_HK
dc.identifier.isiWOS:000182739500016-
dc.publisher.placeCanadaen_HK
dc.identifier.scopusauthoridZhu, DY=7403599340en_HK
dc.identifier.scopusauthoridLee, CF=8068602600en_HK
dc.identifier.scopusauthoridLaw, KT=7202563426en_HK

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