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Article: Post-installation residual stresses in preformed piles jacked into granular soils
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TitlePost-installation residual stresses in preformed piles jacked into granular soils
 
AuthorsYu, F2
Tham, LG1
Yang, J1
Lee, PKK1
 
KeywordsBearing Capacity
Construction Effect
Field Test
Neutral Point
Preformed Pile
Residual Stress
 
Issue Date2011
 
Publisher《巖土工程學報》編輯部. The Journal's web site is located at http://218.241.156.197/Jwk_ytgcxb/CN/column/column11.shtml
 
CitationYantu Gongcheng Xuebao/Chinese Journal Of Geotechnical Engineering, 2011, v. 33 n. 10, p. 1526-1536 [How to Cite?]
 
AbstractThe working performance of a preformed pile may be significantly affected by the residual pile stress generated in the pile installation process. A field-test program is conducted in this study to investigate the load transfer behavior of two instrumented steel H-piles jacked into granular deposits during installation. Significant post-installation residual stresses are found to be locked in the test piles. The depth of neutral point for the residual shaft friction increases with increasing pile penetration but their ratios tend to be an invariable. Besides the well-known elasticity coefficient, the factors affecting the residual point resistance include the jacking force and the penetration rate. The average residual negative friction accumulates as the number of jacking strokes increases. Nevertheless, the unit residual negative friction at a given horizon shows a trend of degradation, which can be attributed to the presence of friction fatigue during pile installation. The residual pile stress is responsible for the variation in the stress state of the soils surrounding the pile shaft and beneath the pile base prior to loading service. This indicates that the pile-soil system will follow an unanticipated stress path toward axial loading failure. The data interpretation methods routinely adopted in the static and O-cell loading tests are going to be challenged in case that the influence of post-installation residual stress is involved. Also, the post-installation residual stress imposes positive effect on the uplift capacity of pile and increases the complexity of the plugging behavior of open-ended pipe piles. Assuming that the distribution of residual shaft friction resembles a folded line, a semi-empirical framework is proposed to estimate the residual pile stress at any depth from the knowledge of residual point resistance.
 
ISSN1000-4548
2013 SCImago Journal Rankings: 0.757
 
ReferencesReferences in Scopus
 
DC FieldValue
dc.contributor.authorYu, F
 
dc.contributor.authorTham, LG
 
dc.contributor.authorYang, J
 
dc.contributor.authorLee, PKK
 
dc.date.accessioned2012-06-26T06:05:58Z
 
dc.date.available2012-06-26T06:05:58Z
 
dc.date.issued2011
 
dc.description.abstractThe working performance of a preformed pile may be significantly affected by the residual pile stress generated in the pile installation process. A field-test program is conducted in this study to investigate the load transfer behavior of two instrumented steel H-piles jacked into granular deposits during installation. Significant post-installation residual stresses are found to be locked in the test piles. The depth of neutral point for the residual shaft friction increases with increasing pile penetration but their ratios tend to be an invariable. Besides the well-known elasticity coefficient, the factors affecting the residual point resistance include the jacking force and the penetration rate. The average residual negative friction accumulates as the number of jacking strokes increases. Nevertheless, the unit residual negative friction at a given horizon shows a trend of degradation, which can be attributed to the presence of friction fatigue during pile installation. The residual pile stress is responsible for the variation in the stress state of the soils surrounding the pile shaft and beneath the pile base prior to loading service. This indicates that the pile-soil system will follow an unanticipated stress path toward axial loading failure. The data interpretation methods routinely adopted in the static and O-cell loading tests are going to be challenged in case that the influence of post-installation residual stress is involved. Also, the post-installation residual stress imposes positive effect on the uplift capacity of pile and increases the complexity of the plugging behavior of open-ended pipe piles. Assuming that the distribution of residual shaft friction resembles a folded line, a semi-empirical framework is proposed to estimate the residual pile stress at any depth from the knowledge of residual point resistance.
 
dc.description.natureLink_to_subscribed_fulltext
 
dc.identifier.citationYantu Gongcheng Xuebao/Chinese Journal Of Geotechnical Engineering, 2011, v. 33 n. 10, p. 1526-1536 [How to Cite?]
 
dc.identifier.epage1536
 
dc.identifier.issn1000-4548
2013 SCImago Journal Rankings: 0.757
 
dc.identifier.issue10
 
dc.identifier.scopuseid_2-s2.0-80052135371
 
dc.identifier.spage1526
 
dc.identifier.urihttp://hdl.handle.net/10722/150592
 
dc.identifier.volume33
 
dc.languageeng
 
dc.publisher《巖土工程學報》編輯部. The Journal's web site is located at http://218.241.156.197/Jwk_ytgcxb/CN/column/column11.shtml
 
dc.publisher.placeChina
 
dc.relation.ispartofYantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering
 
dc.relation.referencesReferences in Scopus
 
dc.subjectBearing Capacity
 
dc.subjectConstruction Effect
 
dc.subjectField Test
 
dc.subjectNeutral Point
 
dc.subjectPreformed Pile
 
dc.subjectResidual Stress
 
dc.titlePost-installation residual stresses in preformed piles jacked into granular soils
 
dc.typeArticle
 
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<contributor.author>Tham, LG</contributor.author>
<contributor.author>Yang, J</contributor.author>
<contributor.author>Lee, PKK</contributor.author>
<date.accessioned>2012-06-26T06:05:58Z</date.accessioned>
<date.available>2012-06-26T06:05:58Z</date.available>
<date.issued>2011</date.issued>
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<description.abstract>The working performance of a preformed pile may be significantly affected by the residual pile stress generated in the pile installation process. A field-test program is conducted in this study to investigate the load transfer behavior of two instrumented steel H-piles jacked into granular deposits during installation. Significant post-installation residual stresses are found to be locked in the test piles. The depth of neutral point for the residual shaft friction increases with increasing pile penetration but their ratios tend to be an invariable. Besides the well-known elasticity coefficient, the factors affecting the residual point resistance include the jacking force and the penetration rate. The average residual negative friction accumulates as the number of jacking strokes increases. Nevertheless, the unit residual negative friction at a given horizon shows a trend of degradation, which can be attributed to the presence of friction fatigue during pile installation. The residual pile stress is responsible for the variation in the stress state of the soils surrounding the pile shaft and beneath the pile base prior to loading service. This indicates that the pile-soil system will follow an unanticipated stress path toward axial loading failure. The data interpretation methods routinely adopted in the static and O-cell loading tests are going to be challenged in case that the influence of post-installation residual stress is involved. Also, the post-installation residual stress imposes positive effect on the uplift capacity of pile and increases the complexity of the plugging behavior of open-ended pipe piles. Assuming that the distribution of residual shaft friction resembles a folded line, a semi-empirical framework is proposed to estimate the residual pile stress at any depth from the knowledge of residual point resistance.</description.abstract>
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<subject>Bearing Capacity</subject>
<subject>Construction Effect</subject>
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Author Affiliations
  1. The University of Hong Kong
  2. Zhejiang Sci-Tech University