Prediction of soil properties from the concepts of energy transfer in dynamic penetration tests / Fernando Schnaid in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 8 (Août 2009)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1092–1100 Titre : Prediction of soil properties from the concepts of energy transfer in dynamic penetration tests Type de document : texte imprimé Auteurs : Fernando Schnaid, Auteur ; Edgar Odebrecht, Auteur ; Marcelo Maia Rocha, Auteur Année de publication : 2009 Article en page(s) : pp. 1092–1100 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Soil dynamics Site investigation properties Shear strength Penetration tests Brazil Résumé : Results from dynamic penetration tests are traditionally interpreted on the basis of empirical correlations, this being a frequent criticism to these tests. An alternative rational method of interpretation is proposed in this paper from which the energy delivered to the composition of rods is used to calculate a dynamic force that represents the reaction of the soil to the penetration of the sampler (Fd) . Interpretation of soil properties both in sand and clay is based on this calculated dynamic force from which the internal friction angle and the undrained shear strength can be estimated. This is achieved from a simple combination of limit equilibrium analysis and cavity expansion theory. Case studies gathered from the Brazilian experience are reported in this paper to illustrate the applicability of the proposed approach. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000059 [article] Prediction of soil properties from the concepts of energy transfer in dynamic penetration tests [texte imprimé] / Fernando Schnaid, Auteur ; Edgar Odebrecht, Auteur ; Marcelo Maia Rocha, Auteur . - 2009 . - pp. 1092–1100. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1092–1100 Mots-clés : Soil dynamics Site investigation properties Shear strength Penetration tests Brazil Résumé : Results from dynamic penetration tests are traditionally interpreted on the basis of empirical correlations, this being a frequent criticism to these tests. An alternative rational method of interpretation is proposed in this paper from which the energy delivered to the composition of rods is used to calculate a dynamic force that represents the reaction of the soil to the penetration of the sampler (Fd) . Interpretation of soil properties both in sand and clay is based on this calculated dynamic force from which the internal friction angle and the undrained shear strength can be estimated. This is achieved from a simple combination of limit equilibrium analysis and cavity expansion theory. Case studies gathered from the Brazilian experience are reported in this paper to illustrate the applicability of the proposed approach. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000059

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Uplift performance of anchor plates embedded in cement-stabilized backfill / Nilo Cesar Consoli in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 3 (Mars 2013)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 511-517 Titre : Uplift performance of anchor plates embedded in cement-stabilized backfill Type de document : texte imprimé Auteurs : Nilo Cesar Consoli, Auteur ; Cesar Alberto Ruver, Auteur ; Fernando Schnaid, Auteur Année de publication : 2013 Article en page(s) : pp. 511-517 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : uplifting  cement  in situ tests  pullout  backfills  plates  arches Résumé : A series of pullout tests is presented in this paper and is used to identify the kinematics of failure and the uplift response of circular anchor plates embedded in sand-cement stabilized layers at distinct normalized embedment depths (H/D), where H is the thickness of the treated layer and D is the diameter of the anchor plates. Experimental results show that the uplift capacity of anchor plates embedded in sand backfill layers increases considerably after mixing 3% cement with the backfill material. Distinct failure mechanisms observed for anchor plates embedded in both sand and cement-stabilized backfills are shown to be a function of H/D. The addition of cement to the sand backfill leads to an increase in uplift capacity of 9 times for an H/D ratio of 1.0 and of 13 times for an H/D ratio of 2.0. For sand backfill with H/D=1.0, the failure surface had a truncated cone shape with a vertical inclination of 22°, whereas for H/D of 1.5 and 2.0, radial cracking was observed, and final failure surfaces had inclinations of 26 and 30°, respectively. Pullout of anchor plates in cement-stabilized backfills at H/D ratios ranging from 1.0 to 2.0 exhibit two distinct characteristics: (a) a linear elastic deformation response at small pullout displacements and (b) a later stage where radial fracturing of the stabilized backfill leads to hardening just prior to failure. Radial cracks starting at the top of the layer near the center of the anchor plates start to propagate only at about 90% of the final uplift failure load, irrespective of H/D. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000785 [article] Uplift performance of anchor plates embedded in cement-stabilized backfill [texte imprimé] / Nilo Cesar Consoli, Auteur ; Cesar Alberto Ruver, Auteur ; Fernando Schnaid, Auteur . - 2013 . - pp. 511-517. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 511-517 Mots-clés : uplifting  cement  in situ tests  pullout  backfills  plates  arches Résumé : A series of pullout tests is presented in this paper and is used to identify the kinematics of failure and the uplift response of circular anchor plates embedded in sand-cement stabilized layers at distinct normalized embedment depths (H/D), where H is the thickness of the treated layer and D is the diameter of the anchor plates. Experimental results show that the uplift capacity of anchor plates embedded in sand backfill layers increases considerably after mixing 3% cement with the backfill material. Distinct failure mechanisms observed for anchor plates embedded in both sand and cement-stabilized backfills are shown to be a function of H/D. The addition of cement to the sand backfill leads to an increase in uplift capacity of 9 times for an H/D ratio of 1.0 and of 13 times for an H/D ratio of 2.0. For sand backfill with H/D=1.0, the failure surface had a truncated cone shape with a vertical inclination of 22°, whereas for H/D of 1.5 and 2.0, radial cracking was observed, and final failure surfaces had inclinations of 26 and 30°, respectively. Pullout of anchor plates in cement-stabilized backfills at H/D ratios ranging from 1.0 to 2.0 exhibit two distinct characteristics: (a) a linear elastic deformation response at small pullout displacements and (b) a later stage where radial fracturing of the stabilized backfill leads to hardening just prior to failure. Radial cracks starting at the top of the layer near the center of the anchor plates start to propagate only at about 90% of the final uplift failure load, irrespective of H/D. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000785

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