Shaft capacity of displacement piles in clay using the cone penetration test / Barry M. Lehane in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 2 (Février 2013)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 253-266 Titre : Shaft capacity of displacement piles in clay using the cone penetration test Type de document : texte imprimé Auteurs : Barry M. Lehane, Auteur ; Yunong Li, Auteur ; Ryan Williams, Auteur Année de publication : 2013 Article en page(s) : pp. 253-266 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : shafts  friction  displacement  piles  clays Résumé : The prediction of the shaft capacity of displacement piles in clay still relies wholly on empirical or semiempirical approaches. This paper examines the predictive abilities of five well-known methods against an extended version of an existing database of pile tests. It is seen that coefficients of variation (COVs) of the ratio of calculated to measured capacities (Qc/Qm) are significantly higher than expected. The paper then uses the database of shaft capacities to examine potential relationships between local shaft friction and the cone penetration test end resistance (qt). Predictions are subsequently compared with capacities measured in a series of centrifuge tests and with the distributions of peak frictions observed in two well-documented field tests. Widely different formulations adopted by each of the existing empirical methods give broadly similar COV values for Qc/Qm ratios, and it is concluded that the database of high-quality pile tests needs to be expanded significantly if the reliability of estimates of shaft capacity in clay is to be improved. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000749 [article] Shaft capacity of displacement piles in clay using the cone penetration test [texte imprimé] / Barry M. Lehane, Auteur ; Yunong Li, Auteur ; Ryan Williams, Auteur . - 2013 . - pp. 253-266. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 253-266 Mots-clés : shafts  friction  displacement  piles  clays Résumé : The prediction of the shaft capacity of displacement piles in clay still relies wholly on empirical or semiempirical approaches. This paper examines the predictive abilities of five well-known methods against an extended version of an existing database of pile tests. It is seen that coefficients of variation (COVs) of the ratio of calculated to measured capacities (Qc/Qm) are significantly higher than expected. The paper then uses the database of shaft capacities to examine potential relationships between local shaft friction and the cone penetration test end resistance (qt). Predictions are subsequently compared with capacities measured in a series of centrifuge tests and with the distributions of peak frictions observed in two well-documented field tests. Widely different formulations adopted by each of the existing empirical methods give broadly similar COV values for Qc/Qm ratios, and it is concluded that the database of high-quality pile tests needs to be expanded significantly if the reliability of estimates of shaft capacity in clay is to be improved. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000749

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