Documents disponibles écrits par cet auteur

Liquefaction and cyclic softening potential of soils – a unified piezocone penetration testing-based approach / C. S. Ku in Géotechnique, Vol. 62 N° 5 (Mai 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 5 (Mai 2012) . - pp. 457 –461 Titre : Liquefaction and cyclic softening potential of soils – a unified piezocone penetration testing-based approach Type de document : texte imprimé Auteurs : C. S. Ku, Auteur ; C. H. Juang, Auteur Année de publication : 2012 Article en page(s) : pp. 457 –461 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Soil  classification  In  situ  testing  Liquefaction Résumé : Simplified procedures have been widely accepted and used in practice for assessing cyclic liquefaction resistance of sands. Extension of the simplified procedures for assessing liquefaction resistance of fine-grained soils has not achieved the same degree of success. It would be ideal to have a unified model that is based on in situ testing and is applicable to both sand-like and clay-like soils. This note examines one such model and extends its use to both sand-like and clay-like soils. Herein, verification of this unified model using field data from Adapazari, Turkey after the 1999 earthquake is documented along with comparisons with existing models. Satisfactory results are obtained, which shows that the proposed piezocone penetration test (CPTu)-based model is applicable to both sand-like and clay-like soils. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.044 [article] Liquefaction and cyclic softening potential of soils – a unified piezocone penetration testing-based approach [texte imprimé] / C. S. Ku, Auteur ; C. H. Juang, Auteur . - 2012 . - pp. 457 –461. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 5 (Mai 2012) . - pp. 457 –461 Mots-clés : Soil  classification  In  situ  testing  Liquefaction Résumé : Simplified procedures have been widely accepted and used in practice for assessing cyclic liquefaction resistance of sands. Extension of the simplified procedures for assessing liquefaction resistance of fine-grained soils has not achieved the same degree of success. It would be ideal to have a unified model that is based on in situ testing and is applicable to both sand-like and clay-like soils. This note examines one such model and extends its use to both sand-like and clay-like soils. Herein, verification of this unified model using field data from Adapazari, Turkey after the 1999 earthquake is documented along with comparisons with existing models. Satisfactory results are obtained, which shows that the proposed piezocone penetration test (CPTu)-based model is applicable to both sand-like and clay-like soils. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.044

Reliability of CPT Ic as an index for mechanical behaviour classification of soils / C. S. Ku in Géotechnique, Vol. 60 N° 11 (Novembre 2010) 

Public ISBD [article]  in Géotechnique > Vol. 60 N° 11 (Novembre 2010) . - pp. 861–875 Titre : Reliability of CPT Ic as an index for mechanical behaviour classification of soils Type de document : texte imprimé Auteurs : C. S. Ku, Auteur ; C. H. Juang, Auteur ; C. Y. Ou, Auteur Année de publication : 2011 Article en page(s) : pp. 861–875 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Soil  classification  Liquefaction  Case  history  Statistical  analysis  In  situ  testing Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents results of an analysis of a set of high-quality, side-by-side piezocone penetration test (CPTu) and standard penetration test (SPT) data for examining mechanical behaviour-based classification of soils. The results show that the soil behaviour type index (I c), either defined by Jefferies and Been (denoted herein as I c,BJ) or by Robertson and Wride (denoted herein as I c,RW), is an effective parameter for mechanical behaviour classification. Additionally, an effort is made to find the most suitable I c cut-off (or boundary) value that can delineate cohesionless (sand-like) soils from cohesive (clay-like) soils. The Robertson and Wride's formulation, I c,RW = 2·67 is found capable of delineating these two classes of soils. Similarly for the Been and Jefferies' formulation, I c,BJ = 2·58 is found to be the most suitable I c cut-off value for such classification purpose. These cut-off I c values for distinguishing sand-like soils from clay-like soils are found to be reliable in a case study of liquefaction susceptibility. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.09.p.097 [article] Reliability of CPT Ic as an index for mechanical behaviour classification of soils [texte imprimé] / C. S. Ku, Auteur ; C. H. Juang, Auteur ; C. Y. Ou, Auteur . - 2011 . - pp. 861–875. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 60 N° 11 (Novembre 2010) . - pp. 861–875 Mots-clés : Soil  classification  Liquefaction  Case  history  Statistical  analysis  In  situ  testing Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents results of an analysis of a set of high-quality, side-by-side piezocone penetration test (CPTu) and standard penetration test (SPT) data for examining mechanical behaviour-based classification of soils. The results show that the soil behaviour type index (I c), either defined by Jefferies and Been (denoted herein as I c,BJ) or by Robertson and Wride (denoted herein as I c,RW), is an effective parameter for mechanical behaviour classification. Additionally, an effort is made to find the most suitable I c cut-off (or boundary) value that can delineate cohesionless (sand-like) soils from cohesive (clay-like) soils. The Robertson and Wride's formulation, I c,RW = 2·67 is found capable of delineating these two classes of soils. Similarly for the Been and Jefferies' formulation, I c,BJ = 2·58 is found to be the most suitable I c cut-off value for such classification purpose. These cut-off I c values for distinguishing sand-like soils from clay-like soils are found to be reliable in a case study of liquefaction susceptibility. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.09.p.097

Unified CPTu-based probabilistic model for assessing probability of liquefaction of sand and clay / C. H. Juang in Géotechnique, Vol. 62 N° 10 (Octobre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 10 (Octobre 2012) . - pp. 877 –892 Titre : Unified CPTu-based probabilistic model for assessing probability of liquefaction of sand and clay Type de document : texte imprimé Auteurs : C. H. Juang, Auteur ; Ching, J., Auteur ; C. S. Ku, Auteur Année de publication : 2012 Article en page(s) : pp. 877 –892 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Earthquakes  Sands  Clays  Pore  pressures  Statistical  analysis  Liquefaction  In  situ  testing  Plasticity Résumé : In this paper, a mathematically rigorous process is adopted to derive a piezocone penetration test (CPTu)-based model for assessing the probability of liquefaction/cyclic softening. The new probabilistic model is expressed in the form of a mapping function that relates the liquefaction probability mathematically to the factor of safety obtained from a published deterministic CPTu-based model. The new model is novel because it is applicable to both sand and clay, is more direct (in terms of the usage of CPTu data), is more consistent with a mechanics framework, and allows complete liquefaction assessment (at least for initial screening) without recourse to additional sampling and laboratory testing. Possible variation of the model caused by the variability of the adopted database is investigated and reported. Finally, examples are provided to demonstrate how the proposed model is applied in a future event considering both model and parameter uncertainties. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.P.025 [article] Unified CPTu-based probabilistic model for assessing probability of liquefaction of sand and clay [texte imprimé] / C. H. Juang, Auteur ; Ching, J., Auteur ; C. S. Ku, Auteur . - 2012 . - pp. 877 –892. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 10 (Octobre 2012) . - pp. 877 –892 Mots-clés : Earthquakes  Sands  Clays  Pore  pressures  Statistical  analysis  Liquefaction  In  situ  testing  Plasticity Résumé : In this paper, a mathematically rigorous process is adopted to derive a piezocone penetration test (CPTu)-based model for assessing the probability of liquefaction/cyclic softening. The new probabilistic model is expressed in the form of a mapping function that relates the liquefaction probability mathematically to the factor of safety obtained from a published deterministic CPTu-based model. The new model is novel because it is applicable to both sand and clay, is more direct (in terms of the usage of CPTu data), is more consistent with a mechanics framework, and allows complete liquefaction assessment (at least for initial screening) without recourse to additional sampling and laboratory testing. Possible variation of the model caused by the variability of the adopted database is investigated and reported. Finally, examples are provided to demonstrate how the proposed model is applied in a future event considering both model and parameter uncertainties. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.P.025