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Effect of penetration rate on cone penetration resistance in saturated clayey soils / Kwangkyun Kim in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°8 (Août 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°8 (Août 2008) . - pp. 1142–1153 Titre : Effect of penetration rate on cone penetration resistance in saturated clayey soils Type de document : texte imprimé Auteurs : Kwangkyun Kim, Auteur ; Monica Prezzi, Auteur ; Rodrigo Salgado, Auteur Année de publication : 2008 Article en page(s) : pp. 1142–1153 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Cone  penetration  tests  Penetration  resistance  Clays  Sand Résumé : In this paper, the effects of penetration rate on cone resistance in saturated clayey soils are investigated. Shear strength rate effects in clayey soils are related to two physical processes: the increase of shear strength with increasing rate of loading and the increase of shear strength as the process transitions from undrained to drained. Special focus is placed on this second effect. Cone penetration tests were performed at various penetration rates both in the field and in a calibration chamber, and the resulting data were analyzed. The field cone penetration tests were performed at two test sites with fairly homogeneous clayey silt and silty clay layers located below the groundwater table. Additionally, tests with both cone and flat-tip penetrometers in sand-clay mixtures were performed in a calibration chamber to investigate the change in drainage conditions from undrained to partially drained and from partially drained to fully drained. A series of flexible-wall permeameter tests were conducted in the laboratory for various clayey sand mixtures prepared at various mixing ratios in order to obtain values of the coefficient of consolidation, which is required to estimate the penetration rates below which penetration is drained and above which penetration is undrained. A correlation between cone resistance and drainage conditions was established based on the results of the calibration chamber and field penetration tests. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A8%2811 [...] [article] Effect of penetration rate on cone penetration resistance in saturated clayey soils [texte imprimé] / Kwangkyun Kim, Auteur ; Monica Prezzi, Auteur ; Rodrigo Salgado, Auteur . - 2008 . - pp. 1142–1153. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°8 (Août 2008) . - pp. 1142–1153 Mots-clés : Cone  penetration  tests  Penetration  resistance  Clays  Sand Résumé : In this paper, the effects of penetration rate on cone resistance in saturated clayey soils are investigated. Shear strength rate effects in clayey soils are related to two physical processes: the increase of shear strength with increasing rate of loading and the increase of shear strength as the process transitions from undrained to drained. Special focus is placed on this second effect. Cone penetration tests were performed at various penetration rates both in the field and in a calibration chamber, and the resulting data were analyzed. The field cone penetration tests were performed at two test sites with fairly homogeneous clayey silt and silty clay layers located below the groundwater table. Additionally, tests with both cone and flat-tip penetrometers in sand-clay mixtures were performed in a calibration chamber to investigate the change in drainage conditions from undrained to partially drained and from partially drained to fully drained. A series of flexible-wall permeameter tests were conducted in the laboratory for various clayey sand mixtures prepared at various mixing ratios in order to obtain values of the coefficient of consolidation, which is required to estimate the penetration rates below which penetration is drained and above which penetration is undrained. A correlation between cone resistance and drainage conditions was established based on the results of the calibration chamber and field penetration tests. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A8%2811 [...]

Load and resistance factor design of drilled shafts in sand / D. Basu in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 12 (Décembre 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 12 (Décembre 2012) . - pp. 1455–1469 Titre : Load and resistance factor design of drilled shafts in sand Type de document : texte imprimé Auteurs : D. Basu, Auteur ; Rodrigo Salgado, Auteur Année de publication : 2013 Article en page(s) : pp. 1455–1469 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Load  and  resistance  factor  design  Drilled  shaft  Axial  load  Foundation  design  Sand  Load  factors  Resistance  factors  Limit  states  Reliability  analysis Résumé : Resistance factors are developed for drilled shafts for a design method based on soil variables. The uncertainties associated with the design variables and equations were systematically quantified, and Monte-Carlo simulations were performed to obtain the distributions of the shaft and base capacities. Both the base and shaft capacities were found to follow normal distributions, and the applied dead and live loads were assumed to follow normal and lognormal distributions, respectively. Reliability analysis was then performed to obtain the limit state and nominal resistances and loads for a variety of soil profiles and pile dimensions. The optimal dead- and live-load factors were subsequently obtained from the analysis. The optimal resistance factors were then adjusted for use with the load factors recommended by the Federal Highway Administration. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000714 [article] Load and resistance factor design of drilled shafts in sand [texte imprimé] / D. Basu, Auteur ; Rodrigo Salgado, Auteur . - 2013 . - pp. 1455–1469. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 12 (Décembre 2012) . - pp. 1455–1469 Mots-clés : Load  and  resistance  factor  design  Drilled  shaft  Axial  load  Foundation  design  Sand  Load  factors  Resistance  factors  Limit  states  Reliability  analysis Résumé : Resistance factors are developed for drilled shafts for a design method based on soil variables. The uncertainties associated with the design variables and equations were systematically quantified, and Monte-Carlo simulations were performed to obtain the distributions of the shaft and base capacities. Both the base and shaft capacities were found to follow normal distributions, and the applied dead and live loads were assumed to follow normal and lognormal distributions, respectively. Reliability analysis was then performed to obtain the limit state and nominal resistances and loads for a variety of soil profiles and pile dimensions. The optimal dead- and live-load factors were subsequently obtained from the analysis. The optimal resistance factors were then adjusted for use with the load factors recommended by the Federal Highway Administration. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000714

Load and resistance factors for internal stability checks of mechanically stabilized earth walls / Dongwook Kim in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 8 (Août 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 910–921 Titre : Load and resistance factors for internal stability checks of mechanically stabilized earth walls Type de document : texte imprimé Auteurs : Dongwook Kim, Auteur ; Rodrigo Salgado, Auteur Année de publication : 2012 Article en page(s) : pp. 910–921 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Mechanically  stabilized  earth  walls  Steel  strip  reinforcement  Ultimate  limit  states  Target  reliability  index  First-order  reliability  method Résumé : This paper focuses on the development of load and resistance factor design (LRFD) for checks of the internal stability of mechanically stabilized earth (MSE) walls reinforced with steel strips. The internal stability of MSE walls relies on protection against two ultimate limit states (ULSs): pullout and structural failure of reinforcements. This study proposes equations for the resistances and loads that reflect the physical processes involved in the pullout and structural failure ULSs and quantify the uncertainties in these equations. These equations are then used to perform reliability analyses using the first-order reliability method (FORM) for different values of target reliability index to obtain load factors and resistance factors for use together with the equations in design. For a given target reliability index and vehicular load on top of an MSE wall, the resistance factor for pullout was highly dependent on reinforcement depth while that for structural failure was insensitive to changes in the design variables in its ULS equation. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000664 [article] Load and resistance factors for internal stability checks of mechanically stabilized earth walls [texte imprimé] / Dongwook Kim, Auteur ; Rodrigo Salgado, Auteur . - 2012 . - pp. 910–921. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 910–921 Mots-clés : Mechanically  stabilized  earth  walls  Steel  strip  reinforcement  Ultimate  limit  states  Target  reliability  index  First-order  reliability  method Résumé : This paper focuses on the development of load and resistance factor design (LRFD) for checks of the internal stability of mechanically stabilized earth (MSE) walls reinforced with steel strips. The internal stability of MSE walls relies on protection against two ultimate limit states (ULSs): pullout and structural failure of reinforcements. This study proposes equations for the resistances and loads that reflect the physical processes involved in the pullout and structural failure ULSs and quantify the uncertainties in these equations. These equations are then used to perform reliability analyses using the first-order reliability method (FORM) for different values of target reliability index to obtain load factors and resistance factors for use together with the equations in design. For a given target reliability index and vehicular load on top of an MSE wall, the resistance factor for pullout was highly dependent on reinforcement depth while that for structural failure was insensitive to changes in the design variables in its ULS equation. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000664

Load testing of a closed-ended pipe pile driven in multilayered soil / Daehyeon Kim in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 4 (Avril 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 4 (Avril 2009) . - pp. 463–473 Titre : Load testing of a closed-ended pipe pile driven in multilayered soil Type de document : texte imprimé Auteurs : Daehyeon Kim, Auteur ; Adriano Virgilio Bica, Auteur ; Rodrigo Salgado, Auteur Année de publication : 2009 Article en page(s) : pp. 463–473 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Bearing  capacity  Pipe  piles  Pile  load  tests  Layered  soils Résumé : Piles are often driven in multilayered soil profiles. The accurate prediction of the ultimate bearing capacity of piles driven in mixed soil is more challenging than that of piles driven in either clay or sand because the mechanical behavior of these soils is better known. In order to study the behavior of closed-ended pipe piles driven into multilayered soil profiles, fully instrumented static and dynamic axial load tests were performed on three piles. One of these piles was tested dynamically and statically. A second pile served as reaction pile in the static load test and was tested dynamically. A third pile was tested dynamically. The base of each pile was embedded slightly in a very dense nonplastic silt layer overlying a clay layer. In this paper, results of these pile load tests are presented, and the lessons learned from the interpretation of the test data are discussed. A comparison is made of the ultimate base and limit shaft resistances measured in the pile load tests with corresponding values predicted from in situ test-based and soil property-based design methods. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A4%2846 [...] [article] Load testing of a closed-ended pipe pile driven in multilayered soil [texte imprimé] / Daehyeon Kim, Auteur ; Adriano Virgilio Bica, Auteur ; Rodrigo Salgado, Auteur . - 2009 . - pp. 463–473. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 4 (Avril 2009) . - pp. 463–473 Mots-clés : Bearing  capacity  Pipe  piles  Pile  load  tests  Layered  soils Résumé : Piles are often driven in multilayered soil profiles. The accurate prediction of the ultimate bearing capacity of piles driven in mixed soil is more challenging than that of piles driven in either clay or sand because the mechanical behavior of these soils is better known. In order to study the behavior of closed-ended pipe piles driven into multilayered soil profiles, fully instrumented static and dynamic axial load tests were performed on three piles. One of these piles was tested dynamically and statically. A second pile served as reaction pile in the static load test and was tested dynamically. A third pile was tested dynamically. The base of each pile was embedded slightly in a very dense nonplastic silt layer overlying a clay layer. In this paper, results of these pile load tests are presented, and the lessons learned from the interpretation of the test data are discussed. A comparison is made of the ultimate base and limit shaft resistances measured in the pile load tests with corresponding values predicted from in situ test-based and soil property-based design methods. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A4%2846 [...]

Shear strength and stiffness of sands containing plastic or nonplastic fines / J. Antonio H. Carraro in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 9 (Septembre 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 9 (Septembre 2009) . - pp. 1167–1178 Titre : Shear strength and stiffness of sands containing plastic or nonplastic fines Type de document : texte imprimé Auteurs : J. Antonio H. Carraro, Auteur ; Monica Prezzi, Auteur ; Rodrigo Salgado, Auteur Année de publication : 2009 Article en page(s) : pp. 1167–1178 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : SandSiltsClaysMechanical  propertiesDrainageDilatancyStiffnessShear  strength Résumé : This paper presents the results of a systematic laboratory investigation on the static behavior of silica sand containing various amounts of either plastic or nonplastic fines. Specimens were reconstituted using a new technique suitable for element testing of homogeneous specimens of sands containing fines deposited in water (e.g., alluvial deposits, hydraulic fills, tailings dams, and offshore deposits). The fabric of sands containing fines was examined using the environmental scanning electron microscope (ESEM). Static, monotonic, isotropically consolidated, drained triaxial compression tests were performed to evaluate the stress-strain-volumetric response of these soils. Piezoceramic bender element instrumentation was developed and integrated into a conventional triaxial apparatus; shear-wave velocity measurements were made to evaluate the small-strain stiffness of the sands tested at various states. The intrinsic parameters that characterize critical state, dilatancy, and small-strain stiffness of clean, silty, and clayey sands were determined. All aspects of the mechanical behavior investigated in this study (e.g., stress-strain-volumetric response, shear strength, and small-strain stiffness) are affected by both the amount and plasticity of the fines present in the sand. Microstructural evaluation using the ESEM highlighted the importance of soil fabric on the overall soil response. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A9%2811 [...] [article] Shear strength and stiffness of sands containing plastic or nonplastic fines [texte imprimé] / J. Antonio H. Carraro, Auteur ; Monica Prezzi, Auteur ; Rodrigo Salgado, Auteur . - 2009 . - pp. 1167–1178. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 9 (Septembre 2009) . - pp. 1167–1178 Mots-clés : SandSiltsClaysMechanical  propertiesDrainageDilatancyStiffnessShear  strength Résumé : This paper presents the results of a systematic laboratory investigation on the static behavior of silica sand containing various amounts of either plastic or nonplastic fines. Specimens were reconstituted using a new technique suitable for element testing of homogeneous specimens of sands containing fines deposited in water (e.g., alluvial deposits, hydraulic fills, tailings dams, and offshore deposits). The fabric of sands containing fines was examined using the environmental scanning electron microscope (ESEM). Static, monotonic, isotropically consolidated, drained triaxial compression tests were performed to evaluate the stress-strain-volumetric response of these soils. Piezoceramic bender element instrumentation was developed and integrated into a conventional triaxial apparatus; shear-wave velocity measurements were made to evaluate the small-strain stiffness of the sands tested at various states. The intrinsic parameters that characterize critical state, dilatancy, and small-strain stiffness of clean, silty, and clayey sands were determined. All aspects of the mechanical behavior investigated in this study (e.g., stress-strain-volumetric response, shear strength, and small-strain stiffness) are affected by both the amount and plasticity of the fines present in the sand. Microstructural evaluation using the ESEM highlighted the importance of soil fabric on the overall soil response. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A9%2811 [...]