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Hyperbolic model for load tests on instrumented drilled shafts in intermediate geomaterials and rock / Ramesh Chandra Gupta in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 11 (Novembre 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1407-1414 Titre : Hyperbolic model for load tests on instrumented drilled shafts in intermediate geomaterials and rock Type de document : texte imprimé Auteurs : Ramesh Chandra Gupta, Auteur Année de publication : 2013 Article en page(s) : pp. 1407-1414 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Load  tests  O-cell  load  tests  Drilled  shafts  Rock  Rock  mass  modulus  Rock-socket  side  friction  Intermediate  geomaterials  Ultimate  side  frictional  resistance  End  bearing  resistance Résumé : Analyses of load tests on instrumented drilled shafts in intermediate geomaterials (IGMs) and rock are performed using a hyperbolic model for relative displacement (Δ)/shaft diameter (d)versus side friction (fs) data. Ultimate side friction (fsu) determined from these analyses for IGMs compares well with those determined from pressuremeter tests. For rock with a rock quality designation (RQD) greater than 50%, values of fsu are approximately equal to rock socket unit friction (qSR), estimated using 28-day strength (f′c) of drilled shaft concrete, but for RQD less than 50%, fsu is approximately equal to qSR, estimated using uniaxial strength (qu) of rock cores and reduction factor (αE) to account for jointing in rock. Linear elastic shear modulus (G) for IGMs determined from these analyses is approximately equal or slightly less than reload modulus (Gr) determined from the pressuremeter test. Rock mass modulus (Em) also matches with values determined from correlations. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000697 [article] Hyperbolic model for load tests on instrumented drilled shafts in intermediate geomaterials and rock [texte imprimé] / Ramesh Chandra Gupta, Auteur . - 2013 . - pp. 1407-1414. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1407-1414 Mots-clés : Load  tests  O-cell  load  tests  Drilled  shafts  Rock  Rock  mass  modulus  Rock-socket  side  friction  Intermediate  geomaterials  Ultimate  side  frictional  resistance  End  bearing  resistance Résumé : Analyses of load tests on instrumented drilled shafts in intermediate geomaterials (IGMs) and rock are performed using a hyperbolic model for relative displacement (Δ)/shaft diameter (d)versus side friction (fs) data. Ultimate side friction (fsu) determined from these analyses for IGMs compares well with those determined from pressuremeter tests. For rock with a rock quality designation (RQD) greater than 50%, values of fsu are approximately equal to rock socket unit friction (qSR), estimated using 28-day strength (f′c) of drilled shaft concrete, but for RQD less than 50%, fsu is approximately equal to qSR, estimated using uniaxial strength (qu) of rock cores and reduction factor (αE) to account for jointing in rock. Linear elastic shear modulus (G) for IGMs determined from these analyses is approximately equal or slightly less than reload modulus (Gr) determined from the pressuremeter test. Rock mass modulus (Em) also matches with values determined from correlations. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000697