Documents disponibles écrits par cet auteur

Embedded cantilever retaining walls in sand / A. Z. Li in Géotechnique, Vol. 60 N° 11 (Novembre 2010) 

Public ISBD [article]  in Géotechnique > Vol. 60 N° 11 (Novembre 2010) . - pp. 813–823 Titre : Embedded cantilever retaining walls in sand Type de document : texte imprimé Auteurs : A. Z. Li, Auteur ; B. M. Lehane, Auteur Année de publication : 2011 Article en page(s) : pp. 813–823 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Sands  Sands  Case  history  Retaining  walls Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper describes a case history involving staged excavation adjacent to an instrumented cantilever bored pile contiguous wall in sand. The instrumentation enabled reliable estimates to be made of the variation of pile bending moments from which observations are made related to the development of lateral earth pressures. Particle image velocimetry was employed to obtain a unique dataset of lateral and vertical displacement measurements behind the wall, which may be used to evaluate existing predictive approaches for assessment of excavation-induced movements. Simple finite-element back-analyses of the experiment, employing a linear elastic Mohr–Coulomb soil model, showed that measured wall displacements and moments could be predicted using expected effective stress strength parameters, but that best-fit equivalent linear operational stiffnesses were well below those commonly assumed in practice. Creep is shown to have a critical effect on the displacements of the wall and behind the wall and needs to be incorporated in any realistic predictive approach. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.147 [article] Embedded cantilever retaining walls in sand [texte imprimé] / A. Z. Li, Auteur ; B. M. Lehane, Auteur . - 2011 . - pp. 813–823. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 60 N° 11 (Novembre 2010) . - pp. 813–823 Mots-clés : Sands  Sands  Case  history  Retaining  walls Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper describes a case history involving staged excavation adjacent to an instrumented cantilever bored pile contiguous wall in sand. The instrumentation enabled reliable estimates to be made of the variation of pile bending moments from which observations are made related to the development of lateral earth pressures. Particle image velocimetry was employed to obtain a unique dataset of lateral and vertical displacement measurements behind the wall, which may be used to evaluate existing predictive approaches for assessment of excavation-induced movements. Simple finite-element back-analyses of the experiment, employing a linear elastic Mohr–Coulomb soil model, showed that measured wall displacements and moments could be predicted using expected effective stress strength parameters, but that best-fit equivalent linear operational stiffnesses were well below those commonly assumed in practice. Creep is shown to have a critical effect on the displacements of the wall and behind the wall and needs to be incorporated in any realistic predictive approach. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.147

Lateral soil stiffness adjacent to deep integral bridge abutments / B. M. Lehane in Géotechnique, Vol. 61 N° 7 (Juillet 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 7 (Juillet 2011) . - pp. 593–603 Titre : Lateral soil stiffness adjacent to deep integral bridge abutments Type de document : texte imprimé Auteurs : B. M. Lehane, Auteur Année de publication : 2011 Article en page(s) : pp. 593–603 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Repeated  loading  Soil/Structure  interaction  Sands Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Our understanding of the performance of integral bridge abutments subjected to cyclic loading has been improved using well-designed laboratory experiments, and by observation of abutment performance in the field. However, there remains significant uncertainty on how the increase in lateral stress that arises due to cycling of the backfill may be assessed for abutment design. Such uncertainty is addressed in this paper by drawing on results from a series of experiments performed using the University of Western Australia (UWA) beam centrifuge. The experimental results shed light on the effects, for granular backfill, of initial density, retained height, cyclic history and particle shape. These results, as well as observations made from tests involving overconsolidated clays, are used in conjunction with the existing database of lateral stress measurements to assist in the development of recommendations for assessment of design lateral stresses on deep integral bridge abutments. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/search?value1=%27repeated+loading%27&option1=fu [...] [article] Lateral soil stiffness adjacent to deep integral bridge abutments [texte imprimé] / B. M. Lehane, Auteur . - 2011 . - pp. 593–603. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 7 (Juillet 2011) . - pp. 593–603 Mots-clés : Repeated  loading  Soil/Structure  interaction  Sands Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Our understanding of the performance of integral bridge abutments subjected to cyclic loading has been improved using well-designed laboratory experiments, and by observation of abutment performance in the field. However, there remains significant uncertainty on how the increase in lateral stress that arises due to cycling of the backfill may be assessed for abutment design. Such uncertainty is addressed in this paper by drawing on results from a series of experiments performed using the University of Western Australia (UWA) beam centrifuge. The experimental results shed light on the effects, for granular backfill, of initial density, retained height, cyclic history and particle shape. These results, as well as observations made from tests involving overconsolidated clays, are used in conjunction with the existing database of lateral stress measurements to assist in the development of recommendations for assessment of design lateral stresses on deep integral bridge abutments. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/search?value1=%27repeated+loading%27&option1=fu [...]

Nonlinear cone penetration test-based method for predicting footing settlements on sand / C. D. O'Loughlin in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 409-416 Titre : Nonlinear cone penetration test-based method for predicting footing settlements on sand Type de document : texte imprimé Auteurs : C. D. O'Loughlin, Auteur ; B. M. Lehane, Auteur Article en page(s) : pp. 409-416 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Stiffness  Settlement  Centrifuge  modeling  Sand  Cone  penetration  test  Schmertmann's  method Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents centrifuge data from model footing tests on dry sand, where a high resolution optical displacement measurement technique was employed to record subsurface soil displacements beneath the centerline of loaded strip footings. These measurements allow derivation of vertical strain profiles, which are then used to estimate operational soil stiffness values. The stiffness values, which were assessed assuming a dependence on cone penetration test tip resistance and initial vertical effective stress level, are shown to degrade rapidly with increasing strain level. Despite such nonlinearity, the experimental strain data can be represented using an updated form of the well known Schmertmann strain influence profile. Settlements calculated using this profile are shown to be in agreement with subsurface settlements when appropriate soil stiffness values are employed. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...] [article] Nonlinear cone penetration test-based method for predicting footing settlements on sand [texte imprimé] / C. D. O'Loughlin, Auteur ; B. M. Lehane, Auteur . - pp. 409-416. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 409-416 Mots-clés : Stiffness  Settlement  Centrifuge  modeling  Sand  Cone  penetration  test  Schmertmann's  method Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents centrifuge data from model footing tests on dry sand, where a high resolution optical displacement measurement technique was employed to record subsurface soil displacements beneath the centerline of loaded strip footings. These measurements allow derivation of vertical strain profiles, which are then used to estimate operational soil stiffness values. The stiffness values, which were assessed assuming a dependence on cone penetration test tip resistance and initial vertical effective stress level, are shown to degrade rapidly with increasing strain level. Despite such nonlinearity, the experimental strain data can be represented using an updated form of the well known Schmertmann strain influence profile. Settlements calculated using this profile are shown to be in agreement with subsurface settlements when appropriate soil stiffness values are employed. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...]

Role of linear elasticity in pile group analysis and load test interpretation / Y. F. Leung in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 12 (Décembre 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1686-1694 Titre : Role of linear elasticity in pile group analysis and load test interpretation Type de document : texte imprimé Auteurs : Y. F. Leung, Auteur ; K. Soga, Auteur ; B. M. Lehane, Auteur Année de publication : 2011 Article en page(s) : pp. 1686-1694 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Pile  groups  Pile  foundations  Soil-pile  interactions Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper compares linear-elastic and nonlinear pile group analysis methods through settlement analyses of hypothetical scenarios and real case studies, and elaborates on the implications for interpretation of pile load test data. Comparisons between linear-elastic and nonlinear methods justify the proposition that pile-to-pile interaction is dominated by linear elasticity, characterized by the small-strain soil stiffness. As the size of a pile group increases, nonlinearity in individual pile behavior becomes overwhelmed by the interaction effects. In such cases, similar estimates will be achieved by both linear and nonlinear methods if the soil modulus is derived from the initial tangent, rather than some secant stiffness, assessed from the load test data. The study clarifies the capabilities and limitations of linear elasticity in pile group analysis and provides guidance on pile test interpretation for analysis of pile group response. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i12/p1686_s1?isAuthorized=no [article] Role of linear elasticity in pile group analysis and load test interpretation [texte imprimé] / Y. F. Leung, Auteur ; K. Soga, Auteur ; B. M. Lehane, Auteur . - 2011 . - pp. 1686-1694. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1686-1694 Mots-clés : Pile  groups  Pile  foundations  Soil-pile  interactions Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper compares linear-elastic and nonlinear pile group analysis methods through settlement analyses of hypothetical scenarios and real case studies, and elaborates on the implications for interpretation of pile load test data. Comparisons between linear-elastic and nonlinear methods justify the proposition that pile-to-pile interaction is dominated by linear elasticity, characterized by the small-strain soil stiffness. As the size of a pile group increases, nonlinearity in individual pile behavior becomes overwhelmed by the interaction effects. In such cases, similar estimates will be achieved by both linear and nonlinear methods if the soil modulus is derived from the initial tangent, rather than some secant stiffness, assessed from the load test data. The study clarifies the capabilities and limitations of linear elasticity in pile group analysis and provides guidance on pile test interpretation for analysis of pile group response. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i12/p1686_s1?isAuthorized=no

The influence of particle shape on the (centrifuge) cone penetration test (CPT) end resistance in uniformly graded granular soils / Q. B. Liu in Géotechnique, Vol. 62 N° 11 (Novembre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 11 (Novembre 2012) . - pp. 973 –984 Titre : The influence of particle shape on the (centrifuge) cone penetration test (CPT) end resistance in uniformly graded granular soils Type de document : texte imprimé Auteurs : Q. B. Liu, Auteur ; B. M. Lehane, Auteur Année de publication : 2012 Article en page(s) : pp. 973 –984 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Shear  strength  Sand  Centrifuge  modelling Résumé : The paper examines the effect of particle shape on the end resistance measured in a series of centrifuge cone penetration tests (CPTs) conducted in four uniformly graded silica materials, each with its own distinctive particle-shape characteristic. The CPTs were performed at three different centrifuge g-levels and two different relative densities. A parallel series of shear-box tests allowed determination of the materials' shearing characteristics, and led to the development of an expression for peak friction angle that incorporates the influence of particle shape. A simple approach to predict the CPT end resistance employing this expression is shown to match the measured centrifuge CPT data and hence assist with quantification of the relative importance of particle shape on the CPT end resistance. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.077 [article] The influence of particle shape on the (centrifuge) cone penetration test (CPT) end resistance in uniformly graded granular soils [texte imprimé] / Q. B. Liu, Auteur ; B. M. Lehane, Auteur . - 2012 . - pp. 973 –984. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 11 (Novembre 2012) . - pp. 973 –984 Mots-clés : Shear  strength  Sand  Centrifuge  modelling Résumé : The paper examines the effect of particle shape on the end resistance measured in a series of centrifuge cone penetration tests (CPTs) conducted in four uniformly graded silica materials, each with its own distinctive particle-shape characteristic. The CPTs were performed at three different centrifuge g-levels and two different relative densities. A parallel series of shear-box tests allowed determination of the materials' shearing characteristics, and led to the development of an expression for peak friction angle that incorporates the influence of particle shape. A simple approach to predict the CPT end resistance employing this expression is shown to match the measured centrifuge CPT data and hence assist with quantification of the relative importance of particle shape on the CPT end resistance. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.077

Uplift performance of transmission tower foundations embedded in clay / M. J. Rattley in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°4 (Avril 2008) 

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