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Pile setup in cohesive soil / Kam W. Ng in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 199-209 Titre : Pile setup in cohesive soil : I: experimental investigation Type de document : texte imprimé Auteurs : Kam W. Ng, Auteur ; Matthew Roling, Auteur ; Sherif S. AbdelSalam, Auteur Année de publication : 2013 Article en page(s) : pp. 199-209 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : pile  setup;  load  tests;  cohesive  soil;  coefficient  of  consolidation;  undrained  shear  strength;  standard  penetration  test  (SPT)  N-value Résumé : Pile setup in cohesive soils has been a known phenomenon for several decades. However, a systematic field investigation to provide the needed data to develop analytical procedures and integrate pile setup into the design method rarely exists. This paper summarizes a recently completed field investigation on five fully instrumented steel H-piles embedded in cohesive soils, while a companion paper discusses the development of the pile setup method. During the field investigation, detailed soil characterization, monitoring of soil total lateral stress and pore-water pressure, collection of pile dynamic restrike data as a function of time, and vertical static load tests were completed. Restrike measurements confirm that pile setup occurs at a logarithmic rate following the end of driving, and its development correlates well with the rate of dissipation of the measured pore-water pressure. Based on the field data collected, it was concluded that the skin friction component, not the end bearing, contributes predominantly to the setup, which can be accurately estimated for practical purposes using soil properties, such as coefficient of consolidation, undrained shear strength, and the standard penetration test N-value. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000751 [article] Pile setup in cohesive soil : I: experimental investigation [texte imprimé] / Kam W. Ng, Auteur ; Matthew Roling, Auteur ; Sherif S. AbdelSalam, Auteur . - 2013 . - pp. 199-209. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 199-209 Mots-clés : pile  setup;  load  tests;  cohesive  soil;  coefficient  of  consolidation;  undrained  shear  strength;  standard  penetration  test  (SPT)  N-value Résumé : Pile setup in cohesive soils has been a known phenomenon for several decades. However, a systematic field investigation to provide the needed data to develop analytical procedures and integrate pile setup into the design method rarely exists. This paper summarizes a recently completed field investigation on five fully instrumented steel H-piles embedded in cohesive soils, while a companion paper discusses the development of the pile setup method. During the field investigation, detailed soil characterization, monitoring of soil total lateral stress and pore-water pressure, collection of pile dynamic restrike data as a function of time, and vertical static load tests were completed. Restrike measurements confirm that pile setup occurs at a logarithmic rate following the end of driving, and its development correlates well with the rate of dissipation of the measured pore-water pressure. Based on the field data collected, it was concluded that the skin friction component, not the end bearing, contributes predominantly to the setup, which can be accurately estimated for practical purposes using soil properties, such as coefficient of consolidation, undrained shear strength, and the standard penetration test N-value. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000751

Pile setup in cohesive soil / Kam W. Ng in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 210-222 Titre : Pile setup in cohesive soil : II: analytical quantifications and design recommendations Type de document : texte imprimé Auteurs : Kam W. Ng, Auteur ; Muhannad T. Suleiman, Auteur ; Sritharan, Sri, Auteur Année de publication : 2013 Article en page(s) : pp. 210-222 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : pile  setup;  undrained  shear  strength;  SPT;  coefficient  of  consolidation;  restrikes;  static  load  test Résumé : This paper establishes a methodology to quantify pile setup by using recent field test data that was presented in a companion paper for steel H-piles driven in cohesive soils. Existing methods found in literature for the same purpose either require restrikes of piles onsite or are developed for a specific soil type and seldom use easily quantifiable soil properties, despite their significant influence on pile setup. Following a critical evaluation of the existing methods, a new approach for estimating pile setup was developed using dynamic measurements and analyses in combination with measured soil properties, such as the horizontal coefficient of consolidation, undrained shear strength, and the standard penetration test N value. Using pile setup information available in the literature, the proposed approach has shown that it provides good estimates for the setup of steel H-piles, as well as for other types and sizes of driven piles. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000753 [article] Pile setup in cohesive soil : II: analytical quantifications and design recommendations [texte imprimé] / Kam W. Ng, Auteur ; Muhannad T. Suleiman, Auteur ; Sritharan, Sri, Auteur . - 2013 . - pp. 210-222. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 210-222 Mots-clés : pile  setup;  undrained  shear  strength;  SPT;  coefficient  of  consolidation;  restrikes;  static  load  test Résumé : This paper establishes a methodology to quantify pile setup by using recent field test data that was presented in a companion paper for steel H-piles driven in cohesive soils. Existing methods found in literature for the same purpose either require restrikes of piles onsite or are developed for a specific soil type and seldom use easily quantifiable soil properties, despite their significant influence on pile setup. Following a critical evaluation of the existing methods, a new approach for estimating pile setup was developed using dynamic measurements and analyses in combination with measured soil properties, such as the horizontal coefficient of consolidation, undrained shear strength, and the standard penetration test N value. Using pile setup information available in the literature, the proposed approach has shown that it provides good estimates for the setup of steel H-piles, as well as for other types and sizes of driven piles. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000753