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]  inJournal 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 Drilled shafts Rock mass modulus Rock-socket side friction Intermediate geomaterials Ultimate frictional resistance End bearing 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 Drilled shafts Rock mass modulus Rock-socket side friction Intermediate geomaterials Ultimate frictional resistance End bearing 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

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