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Détail de l'auteur
Auteur Leshchinsky, Dov
Documents disponibles écrits par cet auteur
Affiner la rechercheAnalyzing Dynamic Behavior of Geopsynthetic-Reinforced Soil Retaining Walls / Ling, Hoe I. in Journal of engineering mechanics, Vol. 130 N°8 (Août 2004)
in Journal of engineering mechanics > Vol. 130 N°8 (Août 2004) . - 911-920 p.
Titre : Analyzing Dynamic Behavior of Geopsynthetic-Reinforced Soil Retaining Walls Titre original : Analyse du Comportement Dynamique des Murs de Soutènement Renforcés Geo-Synthétiques de Sol Type de document : texte imprimé Auteurs : Ling, Hoe I., Auteur ; Huabei Liu, Auteur ; Kaliakin, Victor N. ; Leshchinsky, Dov ; Landis, Eric N., Editeur scientifique Article en page(s) : 911-920 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Retaining walls Soil structure Geosynthetics Plasticity Finite elements Murs de soutènement Structure de sol Geosynthètiques Plasticité Eléments finis Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : An advanced generalized plasticity soil model and bounding surface geosynthetic model, in conjunction with a dynamic finite element procedure, are used to analyze the behavior of geosynthetic-reinforced soil retaining walls. The construction behavior of a full-scale wall is first analyzed followed by a series of five shaking table tests conducted in a centrifuge. The parameters for the sandy backfill soils are calibrated through the results of monotonic and cyclic triaxial tests. The wall facing deformations, strains in the geogrid reinforcement layers, lateral earth pressures acting at the facing blocks, and vertical stresses at the foundation are presented. In the centrifugal shaking table tests, the response of the walls subject to 20 cycles of sinusoidal wave having a frequency of 2 Hz and of acceleration amplitude of 0.2g are compared with the results of analysis. The acceleration in the backfill, strain in the geogrid layers, and facing deformation are computed and compared to the test results. The results of analysis for both static and dynamic tests compared reasonably well with the experimental results.
Un modèle généralisé avançé de sol de plasticité et le modèle geo-synthétique extérieur de bondissement, en même temps qu'un procédé fini dynamique d'élément, sont employés pour analyser le comportement des murs de soutènement renforcés geosynthetic de sol. Le comportement de construction d'un mur complet est d'abord analysé suivi d'une série de cinq essais de secousse de table effectués dans une centrifugeuse. Les paramètres pour sandy remblayent des sols sont calibrés par les résultats des essais à trois axes monotoniques et cycliques. Les déformations de revêtements de mur, contraintes dans les couches de renfort de geo-grille, la terre latérale pressurise l'action aux blocs de revêtements, et des efforts verticaux à la base sont présentés. Dans le centrifugeur secouant des essais de table, la réponse des murs sujet à 20 cycles de la vague sinusoïdale ayant une fréquence de 2 hertz et d'amplitude d'accélération de 0.2g sont comparées aux résultats de l'analyse. L'accélération dans le remblai, la contrainte dans les couches de geo-grille, et la déformation de revêtements sont calculées et comparées aux résultats d'essai. Les résultats de l'analyse pour les essais statiques et dynamiques ont raisonnablement bien rivalisé avec les résultats expérimentaux.
DEWEY : 620.1 ISSN : 0733-9399 En ligne : ling@civil.columbia.edu [article] Analyzing Dynamic Behavior of Geopsynthetic-Reinforced Soil Retaining Walls = Analyse du Comportement Dynamique des Murs de Soutènement Renforcés Geo-Synthétiques de Sol [texte imprimé] / Ling, Hoe I., Auteur ; Huabei Liu, Auteur ; Kaliakin, Victor N. ; Leshchinsky, Dov ; Landis, Eric N., Editeur scientifique . - 911-920 p.
Génie Mécanique
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 130 N°8 (Août 2004) . - 911-920 p.
Mots-clés : Retaining walls Soil structure Geosynthetics Plasticity Finite elements Murs de soutènement Structure de sol Geosynthètiques Plasticité Eléments finis Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : An advanced generalized plasticity soil model and bounding surface geosynthetic model, in conjunction with a dynamic finite element procedure, are used to analyze the behavior of geosynthetic-reinforced soil retaining walls. The construction behavior of a full-scale wall is first analyzed followed by a series of five shaking table tests conducted in a centrifuge. The parameters for the sandy backfill soils are calibrated through the results of monotonic and cyclic triaxial tests. The wall facing deformations, strains in the geogrid reinforcement layers, lateral earth pressures acting at the facing blocks, and vertical stresses at the foundation are presented. In the centrifugal shaking table tests, the response of the walls subject to 20 cycles of sinusoidal wave having a frequency of 2 Hz and of acceleration amplitude of 0.2g are compared with the results of analysis. The acceleration in the backfill, strain in the geogrid layers, and facing deformation are computed and compared to the test results. The results of analysis for both static and dynamic tests compared reasonably well with the experimental results.
Un modèle généralisé avançé de sol de plasticité et le modèle geo-synthétique extérieur de bondissement, en même temps qu'un procédé fini dynamique d'élément, sont employés pour analyser le comportement des murs de soutènement renforcés geosynthetic de sol. Le comportement de construction d'un mur complet est d'abord analysé suivi d'une série de cinq essais de secousse de table effectués dans une centrifugeuse. Les paramètres pour sandy remblayent des sols sont calibrés par les résultats des essais à trois axes monotoniques et cycliques. Les déformations de revêtements de mur, contraintes dans les couches de renfort de geo-grille, la terre latérale pressurise l'action aux blocs de revêtements, et des efforts verticaux à la base sont présentés. Dans le centrifugeur secouant des essais de table, la réponse des murs sujet à 20 cycles de la vague sinusoïdale ayant une fréquence de 2 hertz et d'amplitude d'accélération de 0.2g sont comparées aux résultats de l'analyse. L'accélération dans le remblai, la contrainte dans les couches de geo-grille, et la déformation de revêtements sont calculées et comparées aux résultats d'essai. Les résultats de l'analyse pour les essais statiques et dynamiques ont raisonnablement bien rivalisé avec les résultats expérimentaux.
DEWEY : 620.1 ISSN : 0733-9399 En ligne : ling@civil.columbia.edu
in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 758–767
Titre : Centrifuge modeling of slope ionstability Type de document : texte imprimé Auteurs : Ling, Hoe I., Auteur ; Min-Hao Wu, Auteur ; Leshchinsky, Dov, Auteur Année de publication : 2009 Article en page(s) : pp. 758–767 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Slope stability Centrifuge models Limit equilibrium Rainfall intensity Clays Sand Mixtures Résumé : This paper demonstrates the use of a centrifuge modeling technique in studying slope instability. The slope models were prepared from sand, and sand mixed with 15 and 30% fines by weight, compacted at optimum water content. The validity of the modeling technique was confirmed using slope models of different heights, inclinations, and soil types. The soil behavior was studied under triaxial and plane strain conditions, and the extended Mohr-Coulomb failure criterion was found relevant for expressing the strength of unsaturated compacted soil based on the angle of internal friction and apparent cohesion. The Bishop’s circular mechanism, together with the extended Mohr-Coulomb failure criterion, was able to simulate the slope failure reasonably well. The rainfall of different intensities was then induced on the 60° stable slopes of sand with 15% fines. It was found that the failure of slope under rainfall may be interpreted as a reduction in apparent cohesion. The centrifuge tests also allowed the rainfall intensity-duration threshold curve (local curve) to be generated for the test slopes, and the accumulated rainfall corresponded well to some of the reported field observations. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000024 [article] Centrifuge modeling of slope ionstability [texte imprimé] / Ling, Hoe I., Auteur ; Min-Hao Wu, Auteur ; Leshchinsky, Dov, Auteur . - 2009 . - pp. 758–767.
Geotechnical and geoenvironmental engineering
Langues : Anglais (eng)
in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 758–767
Mots-clés : Slope stability Centrifuge models Limit equilibrium Rainfall intensity Clays Sand Mixtures Résumé : This paper demonstrates the use of a centrifuge modeling technique in studying slope instability. The slope models were prepared from sand, and sand mixed with 15 and 30% fines by weight, compacted at optimum water content. The validity of the modeling technique was confirmed using slope models of different heights, inclinations, and soil types. The soil behavior was studied under triaxial and plane strain conditions, and the extended Mohr-Coulomb failure criterion was found relevant for expressing the strength of unsaturated compacted soil based on the angle of internal friction and apparent cohesion. The Bishop’s circular mechanism, together with the extended Mohr-Coulomb failure criterion, was able to simulate the slope failure reasonably well. The rainfall of different intensities was then induced on the 60° stable slopes of sand with 15% fines. It was found that the failure of slope under rainfall may be interpreted as a reduction in apparent cohesion. The centrifuge tests also allowed the rainfall intensity-duration threshold curve (local curve) to be generated for the test slopes, and the accumulated rainfall corresponded well to some of the reported field observations. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000024
in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 934–944
Titre : Earthquake response of reinforced segmental retaining walls backfilled with substantial percentage of fines Type de document : texte imprimé Auteurs : Ling, Hoe I., Auteur ; Leshchinsky, Dov, Auteur ; Mohri, Yoshiyuki, Auteur Année de publication : 2012 Article en page(s) : pp. 934–944 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Reinforced soil retaining wall Seismic response Earthquake Geosynthetics Low-Quality backfill Silty clay Modular block Résumé : This paper reports on the seismic performance of three geosynthetic-reinforced segmental retaining wall systems backfilled with a silty sand mixture, using a shaking table excited by 1995 Kobe earthquake loadings. The preparation of the backfill mixture and its properties, the tested wall configurations, the reinforcement layouts and instrumentations, and the observed wall performance are described. Visual observations and test results indicate that walls having 0.4-m vertical reinforcement spacing, backfilled with soil containing a large percentage of fines, performed better than those having good-quality sandy soil under otherwise identical conditions. Vertical spacing of 0.8 m with removal of interlocking facing blocks in one of the walls did not lead to global collapse under repeated applications of the Kobe earthquake loadings. Only localized shear failure behind the top block layer was observed as the top facing blocks tended to topple. The good performance was attributable to apparent cohesion in the soil mixture stemming from soil matrix suction and true cohesion. Because this apparent cohesion is affected by the moisture content, its existence must be ensured by providing proper drainage to prevent seepage into the backfill. Considering the risk associated with the use of apparent cohesion, its exclusion from design is recommended. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000669 [article] Earthquake response of reinforced segmental retaining walls backfilled with substantial percentage of fines [texte imprimé] / Ling, Hoe I., Auteur ; Leshchinsky, Dov, Auteur ; Mohri, Yoshiyuki, Auteur . - 2012 . - pp. 934–944.
Géotechnique
Langues : Anglais (eng)
in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 934–944
Mots-clés : Reinforced soil retaining wall Seismic response Earthquake Geosynthetics Low-Quality backfill Silty clay Modular block Résumé : This paper reports on the seismic performance of three geosynthetic-reinforced segmental retaining wall systems backfilled with a silty sand mixture, using a shaking table excited by 1995 Kobe earthquake loadings. The preparation of the backfill mixture and its properties, the tested wall configurations, the reinforcement layouts and instrumentations, and the observed wall performance are described. Visual observations and test results indicate that walls having 0.4-m vertical reinforcement spacing, backfilled with soil containing a large percentage of fines, performed better than those having good-quality sandy soil under otherwise identical conditions. Vertical spacing of 0.8 m with removal of interlocking facing blocks in one of the walls did not lead to global collapse under repeated applications of the Kobe earthquake loadings. Only localized shear failure behind the top block layer was observed as the top facing blocks tended to topple. The good performance was attributable to apparent cohesion in the soil mixture stemming from soil matrix suction and true cohesion. Because this apparent cohesion is affected by the moisture content, its existence must be ensured by providing proper drainage to prevent seepage into the backfill. Considering the risk associated with the use of apparent cohesion, its exclusion from design is recommended. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000669
in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1311-1323
Titre : Exhumed geogrid-reinforced retaining wall Type de document : texte imprimé Auteurs : Leshchinsky, Dov, Auteur ; Baris Imamoglu, Auteur ; Christopher L. Meehan, Auteur Article en page(s) : pp. 1311-1323 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Creep Geogrids Retaining walls Strain gages Stress Reinforcement Reinforced wall Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : An instrumented geogrid-reinforced wall constructed on a highly compressible foundation was deconstructed 16 months after its completion, providing a unique opportunity to exhume and examine the instrumented geogrids that were used to construct the wall. The objectives of this post mortem study were: (1) to inspect the condition of the strain gauges that were attached to the geogrid layers before construction and to verify the reliability of their output; (2) to develop a procedure in which the residual (plastic) strains along exhumed geogrid panels could be determined; and (3) to assess the in situ strain and force distribution along geogrid panels based on the measured residual strains from the exhumed geogrids. After exhumation, it was observed that many of the attached strain gauges failed due to full or partial debonding from the geogrid, thus rendering outputs which potentially underestimated the actual strain. Combining aperture measurements of virgin and exhumed geogrids, all from the same manufacturing lots, enabled the assessment of residual strains following stress relaxation. Laboratory simulation of loading and unloading, including creep and relaxation, yielded a relationship between the measured residual strains and the in situ strain and force distribution; i.e., the residual strain fingerprint provided insight into the behavior of the geogrids within the wall prior to its deconstruction. The mobilized maximum tensile strains in the geogrid panels along the height of the wall were roughly uniform, in the range 4±1%. These findings imply that if the same type of reinforcement had been used throughout the height of the wall, the mobilized force along the height would have been relatively uniform. The back-calculated maximum force in the geogrids indicated that the factor of safety on the long-term strengths of the geogrids ranged from about 1.4 on the stronger/stiffer geogrid to about 1.8 on the weaker/softer geogrid. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...] [article] Exhumed geogrid-reinforced retaining wall [texte imprimé] / Leshchinsky, Dov, Auteur ; Baris Imamoglu, Auteur ; Christopher L. Meehan, Auteur . - pp. 1311-1323.
Géotechnique
Langues : Anglais (eng)
in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1311-1323
Mots-clés : Creep Geogrids Retaining walls Strain gages Stress Reinforcement Reinforced wall Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : An instrumented geogrid-reinforced wall constructed on a highly compressible foundation was deconstructed 16 months after its completion, providing a unique opportunity to exhume and examine the instrumented geogrids that were used to construct the wall. The objectives of this post mortem study were: (1) to inspect the condition of the strain gauges that were attached to the geogrid layers before construction and to verify the reliability of their output; (2) to develop a procedure in which the residual (plastic) strains along exhumed geogrid panels could be determined; and (3) to assess the in situ strain and force distribution along geogrid panels based on the measured residual strains from the exhumed geogrids. After exhumation, it was observed that many of the attached strain gauges failed due to full or partial debonding from the geogrid, thus rendering outputs which potentially underestimated the actual strain. Combining aperture measurements of virgin and exhumed geogrids, all from the same manufacturing lots, enabled the assessment of residual strains following stress relaxation. Laboratory simulation of loading and unloading, including creep and relaxation, yielded a relationship between the measured residual strains and the in situ strain and force distribution; i.e., the residual strain fingerprint provided insight into the behavior of the geogrids within the wall prior to its deconstruction. The mobilized maximum tensile strains in the geogrid panels along the height of the wall were roughly uniform, in the range 4±1%. These findings imply that if the same type of reinforcement had been used throughout the height of the wall, the mobilized force along the height would have been relatively uniform. The back-calculated maximum force in the geogrids indicated that the factor of safety on the long-term strengths of the geogrids ranged from about 1.4 on the stronger/stiffer geogrid to about 1.8 on the weaker/softer geogrid. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...]
in Journal of engineering mechanics > Vol. 136 N° 5 (Mai 2010) . - pp. 653-661
Titre : Finite-element simulations of full-scale modular-block reinforced soil retaining walls under earthquake loading Type de document : texte imprimé Auteurs : Ling, Hoe I., Auteur ; Yang, Songtao, Auteur ; Leshchinsky, Dov, Auteur Année de publication : 2010 Article en page(s) : pp. 653-661 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Finite element method Dynamic analysis Earthquake loads Geosynthetics Soil stabilization Plasticity Retaining walls. Résumé : A finite-element procedure was used to simulate the dynamic behavior of four full-scale reinforced soil retaining walls subjected to earthquake loading. The experiments were conducted at a maximum horizontal acceleration of over 0.8 g, with two walls subjected to only horizontal accelerations and two other walls under simultaneous horizontal and vertical accelerations. The analyzes were conducted using advanced soil and geosynthetic models that were capable of simulating behavior under both monotonic and cyclic loadings. The soil behavior was modeled using a unified general plasticity model, which was developed based on the critical state concept and that considered the stress level effects over a wide range of densities using a single set of parameters. The geosynthetic model was based on the bounding surface concept and it considered the S-shape load-strain behavior of polymeric geogrids. In this paper, the calibrations of the models and details of finite-element analysis are presented. The time response of horizontal and vertical accelerations obtained from the analyses, as well as wall deformations and tensile force in geogrids, were compared with the experimental results. The comparisons showed that the finite-element results rendered satisfactory agreement with the shake table test results. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=ASCERL&CURRENT=null [...] [article] Finite-element simulations of full-scale modular-block reinforced soil retaining walls under earthquake loading [texte imprimé] / Ling, Hoe I., Auteur ; Yang, Songtao, Auteur ; Leshchinsky, Dov, Auteur . - 2010 . - pp. 653-661.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 136 N° 5 (Mai 2010) . - pp. 653-661
Mots-clés : Finite element method Dynamic analysis Earthquake loads Geosynthetics Soil stabilization Plasticity Retaining walls. Résumé : A finite-element procedure was used to simulate the dynamic behavior of four full-scale reinforced soil retaining walls subjected to earthquake loading. The experiments were conducted at a maximum horizontal acceleration of over 0.8 g, with two walls subjected to only horizontal accelerations and two other walls under simultaneous horizontal and vertical accelerations. The analyzes were conducted using advanced soil and geosynthetic models that were capable of simulating behavior under both monotonic and cyclic loadings. The soil behavior was modeled using a unified general plasticity model, which was developed based on the critical state concept and that considered the stress level effects over a wide range of densities using a single set of parameters. The geosynthetic model was based on the bounding surface concept and it considered the S-shape load-strain behavior of polymeric geogrids. In this paper, the calibrations of the models and details of finite-element analysis are presented. The time response of horizontal and vertical accelerations obtained from the analyses, as well as wall deformations and tensile force in geogrids, were compared with the experimental results. The comparisons showed that the finite-element results rendered satisfactory agreement with the shake table test results. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=ASCERL&CURRENT=null [...]
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