Documents disponibles écrits par cet auteur

Estimation of soil permeability using an acoustic technique / Chung R. Song in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°12 (Décembre 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°12 (Décembre 2008) . - pp. 1829–1832 Titre : Estimation of soil permeability using an acoustic technique Type de document : texte imprimé Auteurs : Chung R. Song, Auteur ; Jinwon Kim, Auteur ; A. H.-D. Cheng, Auteur Année de publication : 2009 Article en page(s) : pp. 1829–1832 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Estimation  Acoustic  techniques  Soil  permeability  Saturated  soils Résumé : A new method of estimating the permeability of soils using an acoustic technique is proposed in this technical note. Biot’s coupled theory of mixtures from the mid-1950s, which addresses the relationship between the permeability of saturated soils and the characteristic frequency of elastic waves, is used. The characteristic frequency is determined from the attenuation versus frequency curves obtained by acoustic sweep tests. This study presents the experimental technique for measuring the characteristic frequency of soils and calculation procedure for estimating the permeability of sandy soils. This technical note holds discussion for silty or clayey soils. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A12%281 [...] [article] Estimation of soil permeability using an acoustic technique [texte imprimé] / Chung R. Song, Auteur ; Jinwon Kim, Auteur ; A. H.-D. Cheng, Auteur . - 2009 . - pp. 1829–1832. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°12 (Décembre 2008) . - pp. 1829–1832 Mots-clés : Estimation  Acoustic  techniques  Soil  permeability  Saturated  soils Résumé : A new method of estimating the permeability of soils using an acoustic technique is proposed in this technical note. Biot’s coupled theory of mixtures from the mid-1950s, which addresses the relationship between the permeability of saturated soils and the characteristic frequency of elastic waves, is used. The characteristic frequency is determined from the attenuation versus frequency curves obtained by acoustic sweep tests. This study presents the experimental technique for measuring the characteristic frequency of soils and calculation procedure for estimating the permeability of sandy soils. This technical note holds discussion for silty or clayey soils. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A12%281 [...]

Evaluation of a T-wall section in New Orleans considering 3 D soil-structure interaction / Jinoh Won in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 8 (Août 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 8 (Août 2011) . - pp. 731-742 Titre : Evaluation of a T-wall section in New Orleans considering 3 D soil-structure interaction Type de document : texte imprimé Auteurs : Jinoh Won, Auteur ; Sudarshan Adhikari, Auteur ; Chung R. Song, Auteur Année de publication : 2011 Article en page(s) : pp. 731-742 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Hurricane  Katrina  Levee  T-wall  Lateral  pile  FLAC Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : T-walls in New Orleans survived Hurricane Katrina whereas I-walls obviously failed in several sections. However, it is still unclear whether these T-walls truly survived the hurricane with a fair amount of safety margins or barely survived it with undetected damages. The initial design of T-walls was based on simplified loading conditions with limited consideration of soil-structure interaction. In this study, three-dimensional (3D) numerical analyses were conducted, incorporating realistic loading conditions and soil-structure interactions but with time-saving techniques to evaluate the detailed behavior of T-walls. This paper addressed the procedure of innovative 3D numerical analyses and important findings by using special structural elements in FLAC3D. From this study, T-walls were found to have adequate stress levels in H-piles and concrete walls. However, it showed that the major factor that may cause the instability of the T-wall was the slope instability-type unbalanced force. This unbalanced force, however, was counteracted by the batter piles so that the overall stability of the T-wall system could be maintained. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i8/p731_s1?isAuthorized=no [article] Evaluation of a T-wall section in New Orleans considering 3 D soil-structure interaction [texte imprimé] / Jinoh Won, Auteur ; Sudarshan Adhikari, Auteur ; Chung R. Song, Auteur . - 2011 . - pp. 731-742. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 8 (Août 2011) . - pp. 731-742 Mots-clés : Hurricane  Katrina  Levee  T-wall  Lateral  pile  FLAC Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : T-walls in New Orleans survived Hurricane Katrina whereas I-walls obviously failed in several sections. However, it is still unclear whether these T-walls truly survived the hurricane with a fair amount of safety margins or barely survived it with undetected damages. The initial design of T-walls was based on simplified loading conditions with limited consideration of soil-structure interaction. In this study, three-dimensional (3D) numerical analyses were conducted, incorporating realistic loading conditions and soil-structure interactions but with time-saving techniques to evaluate the detailed behavior of T-walls. This paper addressed the procedure of innovative 3D numerical analyses and important findings by using special structural elements in FLAC3D. From this study, T-walls were found to have adequate stress levels in H-piles and concrete walls. However, it showed that the major factor that may cause the instability of the T-wall was the slope instability-type unbalanced force. This unbalanced force, however, was counteracted by the batter piles so that the overall stability of the T-wall system could be maintained. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i8/p731_s1?isAuthorized=no

Reducing erosion of earthen levees using engineered flood wall surface / Chung R. Song in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 874-881 Titre : Reducing erosion of earthen levees using engineered flood wall surface Type de document : texte imprimé Auteurs : Chung R. Song, Auteur ; Jinwon Kim, Auteur ; Ge Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 874-881 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Erosion  Levee  Hydrodynamics  Overtopping  UMETB  Louisiana Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Erosion was one of the major causes for the failure of New Orleans levee system during Hurricane Katrina. Protection of flood walls from erosion failure can be achieved in many different ways. This study consisted of experimental research to develop engineered flood wall surfaces that can reduce the erosion energy of the plunging water before the water hits the levee surface, so that the flood protection system becomes more resilient. Test results were compared to hydrodynamics simulation results by using FLOW3D. The results revealed that the erosion resistance of levees can be substantially reduced by providing protective structures at the surface of the flood walls. An effectively designed protective structure could reduce the erosion depth as much as 40% and extend the erosion time as much as 400%. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p874_s1?isAuthorized=no [article] Reducing erosion of earthen levees using engineered flood wall surface [texte imprimé] / Chung R. Song, Auteur ; Jinwon Kim, Auteur ; Ge Wang, Auteur . - 2012 . - pp. 874-881. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 874-881 Mots-clés : Erosion  Levee  Hydrodynamics  Overtopping  UMETB  Louisiana Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Erosion was one of the major causes for the failure of New Orleans levee system during Hurricane Katrina. Protection of flood walls from erosion failure can be achieved in many different ways. This study consisted of experimental research to develop engineered flood wall surfaces that can reduce the erosion energy of the plunging water before the water hits the levee surface, so that the flood protection system becomes more resilient. Test results were compared to hydrodynamics simulation results by using FLOW3D. The results revealed that the erosion resistance of levees can be substantially reduced by providing protective structures at the surface of the flood walls. An effectively designed protective structure could reduce the erosion depth as much as 40% and extend the erosion time as much as 400%. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p874_s1?isAuthorized=no