Documents disponibles écrits par cet auteur

Influence of gravel on the compression characteristics of decomposed granite soil / Tae-Gew Ham in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 11 (Novembre 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1574-1577 Titre : Influence of gravel on the compression characteristics of decomposed granite soil Type de document : texte imprimé Auteurs : Tae-Gew Ham, Auteur ; Yukio Nakata, Auteur ; Rolando P. Orense, Auteur Année de publication : 2011 Article en page(s) : pp. 1574-1577 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Compression  Density  Gravel  Compacted  soil  Granular  material Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Large-scale one-dimensional compression tests were performed in order to analyze the influence of gravel on the compression properties of gravel-mixed decomposed granite soils. After adjusting the gravel contents of the said soil, specimens compacted at a certain level of compaction energy and water content were tested. Based on the test results, it was observed that when gravel-mixed decomposed granite soil was compacted at the same energy level, there existed a specific gravel content at which the dry density was maximum and which also produced the minimum compression index. Furthermore, an expression based on two-phase mixture theory was proposed to quantitatively evaluate the effects of gravel content through a material parameter calculated using the theory, and the estimated compression curves agreed very well with the results of the experiments. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i11/p1574_s1?isAuthorized=no [article] Influence of gravel on the compression characteristics of decomposed granite soil [texte imprimé] / Tae-Gew Ham, Auteur ; Yukio Nakata, Auteur ; Rolando P. Orense, Auteur . - 2011 . - pp. 1574-1577. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1574-1577 Mots-clés : Compression  Density  Gravel  Compacted  soil  Granular  material Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Large-scale one-dimensional compression tests were performed in order to analyze the influence of gravel on the compression properties of gravel-mixed decomposed granite soils. After adjusting the gravel contents of the said soil, specimens compacted at a certain level of compaction energy and water content were tested. Based on the test results, it was observed that when gravel-mixed decomposed granite soil was compacted at the same energy level, there existed a specific gravel content at which the dry density was maximum and which also produced the minimum compression index. Furthermore, an expression based on two-phase mixture theory was proposed to quantitatively evaluate the effects of gravel content through a material parameter calculated using the theory, and the estimated compression curves agreed very well with the results of the experiments. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i11/p1574_s1?isAuthorized=no

Influence of gravel on the compression characteristics of decomposed granite soil / Tae-Gew Ham in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 638–639 Titre : Influence of gravel on the compression characteristics of decomposed granite soil Type de document : texte imprimé Auteurs : Tae-Gew Ham, Auteur ; Yukio Nakata, Auteur ; Rolando P. Orense, Auteur Année de publication : 2012 Article en page(s) : pp. 638–639 Note générale : Géotechnique Langues : Anglais (eng) Note de contenu : Closure to “Influence of Gravel on the Compression Characteristics of Decomposed Granite Soil” by Tae-Gew Ham, Yukio Nakata, Rolando P. Orense, and Masayuki Hyodo November 2010, Vol. 136, N°. 11, pp. 1574-1577 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000637 [article] Influence of gravel on the compression characteristics of decomposed granite soil [texte imprimé] / Tae-Gew Ham, Auteur ; Yukio Nakata, Auteur ; Rolando P. Orense, Auteur . - 2012 . - pp. 638–639. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 5 (Mai 2012) . - pp. 638–639 Note de contenu : Closure to “Influence of Gravel on the Compression Characteristics of Decomposed Granite Soil” by Tae-Gew Ham, Yukio Nakata, Rolando P. Orense, and Masayuki Hyodo November 2010, Vol. 136, N°. 11, pp. 1574-1577 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000637

Initial shear modulus of remolded sand-clay mixtures / Suguru Yamada in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°7 (Juillet 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°7 (Juillet 2008) . - pp. 960–971 Titre : Initial shear modulus of remolded sand-clay mixtures Type de document : texte imprimé Auteurs : Suguru Yamada, Auteur ; Masayuki Hyodo, Auteur ; Rolando P. Orense, Auteur Année de publication : 2008 Article en page(s) : pp. 960–971 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Shear  modulus  Dynamic  properties  Material  properties  Clays  Mixtures  Cyclic  tests  Soil  dynamics Résumé : This paper presents the dynamic properties of undisturbed and remolded clays and sand-clay mixtures based on the results of undrained hollow cylindrical torsional cyclic simple shear tests. The clays were obtained from different sites having a wide range of plasticity, covering fluvial and marine sediments. The main focus of this investigation is the dynamic properties of sand-clay mixtures whose properties are intermediate between those of clays and sands. The initial shear moduli are examined in terms of fines content, and conventional plasticity index. An equivalent plasticity index has been defined in the present investigation and a better correlation is obtained between the initial shear modulus of sand-clay mixtures and this parameter than with the conventional plasticity index. Further, a simple method has been suggested to determine the equivalent plasticity index based on the conventional consistency limit tests and grain size analysis. An empirical correlation for predicting the initial shear modulus is also proposed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A7%2896 [...] [article] Initial shear modulus of remolded sand-clay mixtures [texte imprimé] / Suguru Yamada, Auteur ; Masayuki Hyodo, Auteur ; Rolando P. Orense, Auteur . - 2008 . - pp. 960–971. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°7 (Juillet 2008) . - pp. 960–971 Mots-clés : Shear  modulus  Dynamic  properties  Material  properties  Clays  Mixtures  Cyclic  tests  Soil  dynamics Résumé : This paper presents the dynamic properties of undisturbed and remolded clays and sand-clay mixtures based on the results of undrained hollow cylindrical torsional cyclic simple shear tests. The clays were obtained from different sites having a wide range of plasticity, covering fluvial and marine sediments. The main focus of this investigation is the dynamic properties of sand-clay mixtures whose properties are intermediate between those of clays and sands. The initial shear moduli are examined in terms of fines content, and conventional plasticity index. An equivalent plasticity index has been defined in the present investigation and a better correlation is obtained between the initial shear modulus of sand-clay mixtures and this parameter than with the conventional plasticity index. Further, a simple method has been suggested to determine the equivalent plasticity index based on the conventional consistency limit tests and grain size analysis. An empirical correlation for predicting the initial shear modulus is also proposed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A7%2896 [...]

Liquefaction resistance of sandy soils under partially drained condition / Yoichi Yamamoto in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 8 (Août 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1032–1043 Titre : Liquefaction resistance of sandy soils under partially drained condition Type de document : texte imprimé Auteurs : Yoichi Yamamoto, Auteur ; Masayuki Hyodo, Auteur ; Rolando P. Orense, Auteur Année de publication : 2009 Article en page(s) : pp. 1032–1043 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Cyclic  tests  Drainage  Soil  liquefaction  Earthquakes  Sand  Soil  stabilization  Sand Résumé : In order to simulate the effect of drainage on soils adjacent to gravel drains that are installed as countermeasure against liquefaction, several series of cyclic triaxial tests were performed on saturated sands under partially drained conditions. The condition of partial drainage under cyclic loading was simulated in the laboratory using triaxial testing equipment installed with a drainage control valve to precisely regulate the volume of water being drained from test specimens. Effects of both drainage conditions and loading frequencies on cyclic response were incorporated through the coefficient of drainage effect, α∗ . Experimental results showed that for sand exhibiting strain softening, the partially drained response was controlled by the critical effective stress ratio while for sand showing strain hardening behavior, the controlling factor was the phase transformation stress ratio. Moreover, test results indicated that the minimum liquefaction resistance under partially drained conditions can be used as a parameter to describe the liquefaction resistance of sands improved by the gravel drain method. From these results, a simplified procedure for designing gravel drains based on the factor of safety (FL) concept was proposed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000051 [article] Liquefaction resistance of sandy soils under partially drained condition [texte imprimé] / Yoichi Yamamoto, Auteur ; Masayuki Hyodo, Auteur ; Rolando P. Orense, Auteur . - 2009 . - pp. 1032–1043. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1032–1043 Mots-clés : Cyclic  tests  Drainage  Soil  liquefaction  Earthquakes  Sand  Soil  stabilization  Sand Résumé : In order to simulate the effect of drainage on soils adjacent to gravel drains that are installed as countermeasure against liquefaction, several series of cyclic triaxial tests were performed on saturated sands under partially drained conditions. The condition of partial drainage under cyclic loading was simulated in the laboratory using triaxial testing equipment installed with a drainage control valve to precisely regulate the volume of water being drained from test specimens. Effects of both drainage conditions and loading frequencies on cyclic response were incorporated through the coefficient of drainage effect, α∗ . Experimental results showed that for sand exhibiting strain softening, the partially drained response was controlled by the critical effective stress ratio while for sand showing strain hardening behavior, the controlling factor was the phase transformation stress ratio. Moreover, test results indicated that the minimum liquefaction resistance under partially drained conditions can be used as a parameter to describe the liquefaction resistance of sands improved by the gravel drain method. From these results, a simplified procedure for designing gravel drains based on the factor of safety (FL) concept was proposed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000051

Strain-dependent dynamic properties of remolded sand-clay mixtures / Suguru Yamada in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°7 (Juillet 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°7 (Juillet 2008) . - pp. 972–981 Titre : Strain-dependent dynamic properties of remolded sand-clay mixtures Type de document : texte imprimé Auteurs : Suguru Yamada, Auteur ; Masayuki Hyodo, Auteur ; Rolando P. Orense, Auteur Année de publication : 2008 Article en page(s) : pp. 972–981 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Shear  modulus  Damping  Dynamic  properties  Material  properties  Clays  Mixtures  Cyclic  tests  Soil  dynamics Résumé : A series of undrained cyclic torsional simple shear tests using hollow cylindrical torsional shear apparatus was carried out to investigate the dynamic shear moduli and damping properties of clayey specimens with various sand contents and plasticity indices. The clayey soils used were collected from various sites along the coast of west Japan. Among these clayey soils, a clay sample with intermediate plasticity and another with high plasticity were mixed with silica sand at different proportions in order to examine the dynamic properties of sand-clay mixtures. In addition, experiments were carried out on undisturbed and remolded natural clay specimens with various plasticities. The effects of plasticity, loading frequency and confining pressure on the strain dependent normalized shear modulus and damping ratio were examined. Based on the results, empirical correlations for predicting the normalized shear modulus and damping ratio of remolded sand-clay mixtures at various shear strain levels were proposed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A7%2897 [...] [article] Strain-dependent dynamic properties of remolded sand-clay mixtures [texte imprimé] / Suguru Yamada, Auteur ; Masayuki Hyodo, Auteur ; Rolando P. Orense, Auteur . - 2008 . - pp. 972–981. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°7 (Juillet 2008) . - pp. 972–981 Mots-clés : Shear  modulus  Damping  Dynamic  properties  Material  properties  Clays  Mixtures  Cyclic  tests  Soil  dynamics Résumé : A series of undrained cyclic torsional simple shear tests using hollow cylindrical torsional shear apparatus was carried out to investigate the dynamic shear moduli and damping properties of clayey specimens with various sand contents and plasticity indices. The clayey soils used were collected from various sites along the coast of west Japan. Among these clayey soils, a clay sample with intermediate plasticity and another with high plasticity were mixed with silica sand at different proportions in order to examine the dynamic properties of sand-clay mixtures. In addition, experiments were carried out on undisturbed and remolded natural clay specimens with various plasticities. The effects of plasticity, loading frequency and confining pressure on the strain dependent normalized shear modulus and damping ratio were examined. Based on the results, empirical correlations for predicting the normalized shear modulus and damping ratio of remolded sand-clay mixtures at various shear strain levels were proposed. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A7%2897 [...]