Documents disponibles écrits par cet auteur

Effects of groundwater table position and soil properties on stability of slope during rainfall / Harianto Rahardjo 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. 1555-1564 Titre : Effects of groundwater table position and soil properties on stability of slope during rainfall Type de document : texte imprimé Auteurs : Harianto Rahardjo, Auteur ; Alfrendo Satyanaga Nio, Auteur ; Eng-Choon Leong, Auteur Année de publication : 2011 Article en page(s) : pp. 1555-1564 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Rainfall  intensity  Groundwater  table  Residual  soils  Matric  suction  Permeability  Shear  strength  Slope  stability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Rainfall, hydrological condition, and geological formation of slope are important contributing factors to slope failures. Parametric studies were carried out to study the effect of groundwater table position, rainfall intensities, and soil properties in affecting slope stability. Three different groundwater table positions corresponding to the wettest, typical, and driest periods in Singapore and four different rainfall intensities (9, 22, 36, and 80 mm/h) were used in the numerical analyses. Typical soil properties of two main residual soils from the Bukit Timah Granite and the sedimentary Jurong Formation in Singapore were incorporated into the numerical analyses. The changes in factor of safety during rainfall were not affected significantly by the groundwater table near the ground surface due to the relatively small changes in matric suction during rainfall. A delay in response of the minimum factor of safety due to rainfall and a slower recovery rate after rainfall were observed in slopes from the sedimentary Jurong Formation as compared to those slopes from the Bukit Timah Granite. Numerical analyses of an actual residual soil slope from the Bukit Timah Granite at Marsiling Road and a residual soil slope from the sedimentary Jurong Formation at Jalan Kukoh show good agreement with the trends observed in the parametric studies DEWEY : 624.1 ISSN : 1090-0124 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...] [article] Effects of groundwater table position and soil properties on stability of slope during rainfall [texte imprimé] / Harianto Rahardjo, Auteur ; Alfrendo Satyanaga Nio, Auteur ; Eng-Choon Leong, Auteur . - 2011 . - pp. 1555-1564. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1555-1564 Mots-clés : Rainfall  intensity  Groundwater  table  Residual  soils  Matric  suction  Permeability  Shear  strength  Slope  stability Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Rainfall, hydrological condition, and geological formation of slope are important contributing factors to slope failures. Parametric studies were carried out to study the effect of groundwater table position, rainfall intensities, and soil properties in affecting slope stability. Three different groundwater table positions corresponding to the wettest, typical, and driest periods in Singapore and four different rainfall intensities (9, 22, 36, and 80 mm/h) were used in the numerical analyses. Typical soil properties of two main residual soils from the Bukit Timah Granite and the sedimentary Jurong Formation in Singapore were incorporated into the numerical analyses. The changes in factor of safety during rainfall were not affected significantly by the groundwater table near the ground surface due to the relatively small changes in matric suction during rainfall. A delay in response of the minimum factor of safety due to rainfall and a slower recovery rate after rainfall were observed in slopes from the sedimentary Jurong Formation as compared to those slopes from the Bukit Timah Granite. Numerical analyses of an actual residual soil slope from the Bukit Timah Granite at Marsiling Road and a residual soil slope from the sedimentary Jurong Formation at Jalan Kukoh show good agreement with the trends observed in the parametric studies DEWEY : 624.1 ISSN : 1090-0124 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...]

Shear strength equations for unsaturated soil under drying and wetting / Goh Shin Guan in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 4 (Avril 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 594-606 Titre : Shear strength equations for unsaturated soil under drying and wetting Type de document : texte imprimé Auteurs : Goh Shin Guan, Auteur ; Harianto Rahardjo, Auteur ; Eng-Choon Leong, Auteur Année de publication : 2010 Article en page(s) : pp. 594-606 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Shear  strength  Equations  Unsaturated  soils  Drying  Wetting  Hysteresis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Shear strength of unsaturated soil is an important engineering property in various geotechnical designs. In response to varying climatic conditions, unsaturated soil behaves differently under the drying and wetting processes due to hysteresis. Many research works were conducted and numerous equations were proposed for unsaturated shear strength, however, most of them were limited to the soil under the drying process. In this study, shear strength equations were categorized according to the nature of equation, i.e., fitting and prediction type equations. The purpose of this study is to propose prediction type shear strength equations for unsaturated soil under drying and wetting. Twelve published shear strength equations were selected for evaluation. A series of unsaturated consolidated drained triaxial tests were conducted on statically compacted sand-kaolin specimens under drying and wetting to examine the validity of the proposed equations. The experimental results indicated that the specimens on the drying path had a higher shear strength and exhibited more ductility, less stiffness, and contraction during shearing while the specimens on the wetting path had a lower shear strength and exhibited more brittleness, more stiffness, and dilation during shearing. The proposed equations were shown to provide the best predictions on the drying and wetting shear strength results from this study as well as published data in the comparison study. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i4/p594_s1?isAuthorized=no [article] Shear strength equations for unsaturated soil under drying and wetting [texte imprimé] / Goh Shin Guan, Auteur ; Harianto Rahardjo, Auteur ; Eng-Choon Leong, Auteur . - 2010 . - pp. 594-606. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 594-606 Mots-clés : Shear  strength  Equations  Unsaturated  soils  Drying  Wetting  Hysteresis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Shear strength of unsaturated soil is an important engineering property in various geotechnical designs. In response to varying climatic conditions, unsaturated soil behaves differently under the drying and wetting processes due to hysteresis. Many research works were conducted and numerous equations were proposed for unsaturated shear strength, however, most of them were limited to the soil under the drying process. In this study, shear strength equations were categorized according to the nature of equation, i.e., fitting and prediction type equations. The purpose of this study is to propose prediction type shear strength equations for unsaturated soil under drying and wetting. Twelve published shear strength equations were selected for evaluation. A series of unsaturated consolidated drained triaxial tests were conducted on statically compacted sand-kaolin specimens under drying and wetting to examine the validity of the proposed equations. The experimental results indicated that the specimens on the drying path had a higher shear strength and exhibited more ductility, less stiffness, and contraction during shearing while the specimens on the wetting path had a lower shear strength and exhibited more brittleness, more stiffness, and dilation during shearing. The proposed equations were shown to provide the best predictions on the drying and wetting shear strength results from this study as well as published data in the comparison study. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i4/p594_s1?isAuthorized=no

Use of instantaneous profile and statistical methods to determine permeability functions of unsaturated soils / Henry Krisdani in Canadian geotechnical journal, Vol. 46 N° 7 (Juillet 2009) 

Public ISBD [article]  in Canadian geotechnical journal > Vol. 46 N° 7 (Juillet 2009) . - pp. 869-874 Titre : Use of instantaneous profile and statistical methods to determine permeability functions of unsaturated soils Type de document : texte imprimé Auteurs : Henry Krisdani, Auteur ; Harianto Rahardjo, Auteur ; Eng-Choon Leong, Auteur Article en page(s) : pp. 869-874 Note générale : Sciences de la Terre Langues : Anglais (eng) Mots-clés : Instantaneous  profile  method  Statistical  method  Permeability  function  Unsaturated  soil  Méthode  des  profils  instantanés  Méthode  statistique  Fonction  de  perméabilité  Sol  non  saturé Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : This paper presents the determination of permeability functions by direct and indirect methods. The direct method used in this study was the instantaneous profile method, while the indirect method used was the statistical method. The instantaneous profile method was adopted to calculate permeability functions of residual soils used in laboratory slope models. Pore-water pressure measured using tensiometers along the slope models and independently measured soil-water characteristic curves (SWCCs) were used for the instantaneous profile calculation. To obtain a continuous permeability function, the instantaneous profile results were then fitted using the statistical method. Cet article présente des méthodes directes et indirectes pour déterminer les fonctions de perméabilité. La méthode directe utilisée dans cette étude est la méthode des profils instantanés, tandis que la méthode indirecte utilisée est la méthode statistique. La méthode des profils instantanés a servi à calculer les fonctions de perméabilité de sols résiduels provenant de modèles de pentes en laboratoire. La pression interstitielle a été mesurée à l’aide de tensiomètres le long des modèles de pentes; elle a ensuite été utilisée avec des courbes caractéristiques sol-eau mesurées indépendamment pour calculer le profil instantané. Afin d’obtenir une fonction de perméabilité continue, les résultats des profils instantanés ont été ajustés avec la méthode statistique. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...] [article] Use of instantaneous profile and statistical methods to determine permeability functions of unsaturated soils [texte imprimé] / Henry Krisdani, Auteur ; Harianto Rahardjo, Auteur ; Eng-Choon Leong, Auteur . - pp. 869-874. Sciences de la Terre Langues : Anglais (eng) in Canadian geotechnical journal > Vol. 46 N° 7 (Juillet 2009) . - pp. 869-874 Mots-clés : Instantaneous  profile  method  Statistical  method  Permeability  function  Unsaturated  soil  Méthode  des  profils  instantanés  Méthode  statistique  Fonction  de  perméabilité  Sol  non  saturé Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : This paper presents the determination of permeability functions by direct and indirect methods. The direct method used in this study was the instantaneous profile method, while the indirect method used was the statistical method. The instantaneous profile method was adopted to calculate permeability functions of residual soils used in laboratory slope models. Pore-water pressure measured using tensiometers along the slope models and independently measured soil-water characteristic curves (SWCCs) were used for the instantaneous profile calculation. To obtain a continuous permeability function, the instantaneous profile results were then fitted using the statistical method. Cet article présente des méthodes directes et indirectes pour déterminer les fonctions de perméabilité. La méthode directe utilisée dans cette étude est la méthode des profils instantanés, tandis que la méthode indirecte utilisée est la méthode statistique. La méthode des profils instantanés a servi à calculer les fonctions de perméabilité de sols résiduels provenant de modèles de pentes en laboratoire. La pression interstitielle a été mesurée à l’aide de tensiomètres le long des modèles de pentes; elle a ensuite été utilisée avec des courbes caractéristiques sol-eau mesurées indépendamment pour calculer le profil instantané. Afin d’obtenir une fonction de perméabilité continue, les résultats des profils instantanés ont été ajustés avec la méthode statistique. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...]