Documents disponibles écrits par cet auteur

Assessment of subballast filtration under cyclic loading / Laricar Dominic O. Trani 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. 1519-1528 Titre : Assessment of subballast filtration under cyclic loading Type de document : texte imprimé Auteurs : Laricar Dominic O. Trani, Auteur ; Buddhima Indraratna, Auteur Année de publication : 2011 Article en page(s) : pp. 1519-1528 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Soil  porosity  Porous  media  Soil  permeability  Cyclic  loads  Seepage Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents an investigation into the seepage hydraulics of a layer of subballast filter subjected to cyclic loading in a fully saturated environment. A multilayer mathematical approach was used to predict the time-dependent permeability of this filter, with a reduction in porosity as a function of compression under cyclic loading, and the amount of base soil (<150 µm) trapped within the filter voids being the two main aspects of this proposed model. Laboratory test results conducted on a novel cyclic loading permeameter apparatus were used to validate the proposed model. The family of equations that are an integral part of the proposed model are then presented in the form of compact visual guidelines anticipated to provide a more practical tool for railway design practitioners. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...] [article] Assessment of subballast filtration under cyclic loading [texte imprimé] / Laricar Dominic O. Trani, Auteur ; Buddhima Indraratna, Auteur . - 2011 . - pp. 1519-1528. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1519-1528 Mots-clés : Soil  porosity  Porous  media  Soil  permeability  Cyclic  loads  Seepage Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents an investigation into the seepage hydraulics of a layer of subballast filter subjected to cyclic loading in a fully saturated environment. A multilayer mathematical approach was used to predict the time-dependent permeability of this filter, with a reduction in porosity as a function of compression under cyclic loading, and the amount of base soil (<150 µm) trapped within the filter voids being the two main aspects of this proposed model. Laboratory test results conducted on a novel cyclic loading permeameter apparatus were used to validate the proposed model. The family of equations that are an integral part of the proposed model are then presented in the form of compact visual guidelines anticipated to provide a more practical tool for railway design practitioners. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...]

Class A prediction of the behavior of soft estuarine soil foundation stabilized by short vertical drains beneath a rail track / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 5 (Mai 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 686-696 Titre : Class A prediction of the behavior of soft estuarine soil foundation stabilized by short vertical drains beneath a rail track Type de document : texte imprimé Auteurs : Buddhima Indraratna, Auteur ; Cholachat Rujikiatkamjorn, Auteur ; Brook Ewers, Auteur Année de publication : 2010 Article en page(s) : pp. 686-696 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Clays  Cyclic  loads  Laboratory  tests  Railroad  engineering  Subsurface  drainage Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In Australia, very few rail tracks have been constructed directly on deep estuarine deposits. In recent years, Kooragang Island has become a major export terminal and most coal trains need to cross the main lines at Sandgate to enter Kooragang Island. In this study, a rail track built on up to 30 m of thick soft estuarine soil was stabilized with relatively short vertical drains to consolidate the soil just beneath the track, and no additional preloading surcharge was provided, except the weight from the trains. The initial soil compression was caused by the passage of trains with a speed restricted at 40 km/h. From this study, it is shown that prefabricated vertical drains significantly decrease the buildup of excess pore-water pressure during cyclic loading, and also continue to dissipate excess pore-water pressure during the rest period. A preliminary finite-element analysis was employed to examine the performance of vertical drains, and a Class A prediction was obtained in terms of lateral and vertical displacements. The monitored settlement and lateral displacement results are presented and discussed. The study shows that relatively short vertical drains are sufficient for providing stability for rail tracks, without the need for driving deep vertical drains through the entire soft soil depth. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i5/p686_s1?isAuthorized=no [article] Class A prediction of the behavior of soft estuarine soil foundation stabilized by short vertical drains beneath a rail track [texte imprimé] / Buddhima Indraratna, Auteur ; Cholachat Rujikiatkamjorn, Auteur ; Brook Ewers, Auteur . - 2010 . - pp. 686-696. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 686-696 Mots-clés : Clays  Cyclic  loads  Laboratory  tests  Railroad  engineering  Subsurface  drainage Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : In Australia, very few rail tracks have been constructed directly on deep estuarine deposits. In recent years, Kooragang Island has become a major export terminal and most coal trains need to cross the main lines at Sandgate to enter Kooragang Island. In this study, a rail track built on up to 30 m of thick soft estuarine soil was stabilized with relatively short vertical drains to consolidate the soil just beneath the track, and no additional preloading surcharge was provided, except the weight from the trains. The initial soil compression was caused by the passage of trains with a speed restricted at 40 km/h. From this study, it is shown that prefabricated vertical drains significantly decrease the buildup of excess pore-water pressure during cyclic loading, and also continue to dissipate excess pore-water pressure during the rest period. A preliminary finite-element analysis was employed to examine the performance of vertical drains, and a Class A prediction was obtained in terms of lateral and vertical displacements. The monitored settlement and lateral displacement results are presented and discussed. The study shows that relatively short vertical drains are sufficient for providing stability for rail tracks, without the need for driving deep vertical drains through the entire soft soil depth. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i5/p686_s1?isAuthorized=no

Design procedure for vertical drains considering a linear variation of lateral permeability within the smear zone / Cholachat Rujikiatkamjorn in Canadian geotechnical journal, Vol. 46 N° 3 (Mars 2009) 

Public ISBD [article]  in Canadian geotechnical journal > Vol. 46 N° 3 (Mars 2009) . - pp. 270–280 Titre : Design procedure for vertical drains considering a linear variation of lateral permeability within the smear zone Type de document : texte imprimé Auteurs : Cholachat Rujikiatkamjorn, Auteur ; Buddhima Indraratna, Auteur Article en page(s) : pp. 270–280 Note générale : Sciences de la Terre Langues : Anglais (eng) Mots-clés : Consolidation  Design  charts  Smear  zone  Vertical  drains  Consolidation  Tableaux  de  conception  Zone  de  souillure  Drains  verticaux Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : A system of vertical drains with surcharge preloading is an effective method for promoting radial drainage and accelerated soil consolidation. This study presents a procedure for the design of vertical drains that significantly extends the previous technique proposed by the authors to include: (i) a linear reduction of lateral permeability in the smear zone, (ii) the effect of overlapping smear zones in a closely spaced drain network, and (iii) the gain in undrained shear strength due to consolidation. Design examples are provided for both single stage and multi-stage embankment construction demonstrating the convenient use of the proposed solutions in practical situations. Un système de drains verticaux avec pré-chargement en surcharge est un moyen efficace d’encourager le drainage radial et d’accélérer la consolidation du sol. Cette étude présente une procédure pour la conception de drains verticaux qui étend de façon significative la technique proposée précédemment par les auteurs pour inclure: (i) une réduction linéaire de la perméabilité linéaire dans la zone de souillure, (ii) l’effet de zones de souillure se chevauchant dans un réseau de drains situé dans espace restreint et (iii) le gain de résistance au cisaillement dû à la consolidation. Des exemples sont fournis pour des constructions de digues en une ou plusieurs étapes démontrant l’utilisation des solutions proposées pour des situations pratiques. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...] [article] Design procedure for vertical drains considering a linear variation of lateral permeability within the smear zone [texte imprimé] / Cholachat Rujikiatkamjorn, Auteur ; Buddhima Indraratna, Auteur . - pp. 270–280. Sciences de la Terre Langues : Anglais (eng) in Canadian geotechnical journal > Vol. 46 N° 3 (Mars 2009) . - pp. 270–280 Mots-clés : Consolidation  Design  charts  Smear  zone  Vertical  drains  Consolidation  Tableaux  de  conception  Zone  de  souillure  Drains  verticaux Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : A system of vertical drains with surcharge preloading is an effective method for promoting radial drainage and accelerated soil consolidation. This study presents a procedure for the design of vertical drains that significantly extends the previous technique proposed by the authors to include: (i) a linear reduction of lateral permeability in the smear zone, (ii) the effect of overlapping smear zones in a closely spaced drain network, and (iii) the gain in undrained shear strength due to consolidation. Design examples are provided for both single stage and multi-stage embankment construction demonstrating the convenient use of the proposed solutions in practical situations. Un système de drains verticaux avec pré-chargement en surcharge est un moyen efficace d’encourager le drainage radial et d’accélérer la consolidation du sol. Cette étude présente une procédure pour la conception de drains verticaux qui étend de façon significative la technique proposée précédemment par les auteurs pour inclure: (i) une réduction linéaire de la perméabilité linéaire dans la zone de souillure, (ii) l’effet de zones de souillure se chevauchant dans un réseau de drains situé dans espace restreint et (iii) le gain de résistance au cisaillement dû à la consolidation. Des exemples sont fournis pour des constructions de digues en une ou plusieurs étapes démontrant l’utilisation des solutions proposées pour des situations pratiques. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...]

Experimental investigation on effectiveness of a vertical drain under cyclic loads / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 6 (Juin 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 835–839 Titre : Experimental investigation on effectiveness of a vertical drain under cyclic loads Type de document : texte imprimé Auteurs : Buddhima Indraratna, Auteur ; Anass Attya, Auteur ; Cholachat Rujikiatkamjorn, Auteur Année de publication : 2009 Article en page(s) : pp. 835–839 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Clays  Soil  consolidation  Drainage  Laboratory  tests  Repeated  loads  Cyclic  loads Résumé : This study examines the effectiveness of a prefabricated vertical drain (PVD) installed in reconstituted soft clay, where a large cyclic triaxial device was used to simulate repeated loading representing a rail track environment. The experimental data demonstrate that PVD successfully prevents excessive buildup of pore water pressure during cyclic loading, and that dissipation continues to occur after the load is removed. The findings of this study have direct relevance to rail track environments, e.g., in coastal Australia, where PVD installation beneath rail tracks constructed on low-lying estuarine soils has been recently introduced. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000006 [article] Experimental investigation on effectiveness of a vertical drain under cyclic loads [texte imprimé] / Buddhima Indraratna, Auteur ; Anass Attya, Auteur ; Cholachat Rujikiatkamjorn, Auteur . - 2009 . - pp. 835–839. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 835–839 Mots-clés : Clays  Soil  consolidation  Drainage  Laboratory  tests  Repeated  loads  Cyclic  loads Résumé : This study examines the effectiveness of a prefabricated vertical drain (PVD) installed in reconstituted soft clay, where a large cyclic triaxial device was used to simulate repeated loading representing a rail track environment. The experimental data demonstrate that PVD successfully prevents excessive buildup of pore water pressure during cyclic loading, and that dissipation continues to occur after the load is removed. The findings of this study have direct relevance to rail track environments, e.g., in coastal Australia, where PVD installation beneath rail tracks constructed on low-lying estuarine soils has been recently introduced. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000006

Field assessment of the performance of a ballasted rail track with and without geosynthetics / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 907-917 Titre : Field assessment of the performance of a ballasted rail track with and without geosynthetics Type de document : texte imprimé Auteurs : Buddhima Indraratna, Auteur ; Sanjay Nimbalkar, Auteur ; David Christie, Auteur Année de publication : 2010 Article en page(s) : pp. 907-917 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Railroad  tracks  Ballast  Cyclic  loads  Deformation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Understanding the complex mechanisms of stress transfer and strain accumulation in layers of track substructure under repeated wheel loading is essential to predict the desirable track maintenance cycle as well as the design of the new track. Various finite element and analytical techniques have been developed in the past to understand the behavior of composite track layers subjected to repeated wheel loads. The mechanical behavior of ballast is influenced by several factors, including the track confining pressure, type of aggregates, and the number of loading cycles. A field trial was conducted on an instrumented track at Bulli, New South Wales, Australia, with the specific aims of studying the benefits of a geocomposite installed at the ballast-capping interface, and to evaluate the performance of moderately graded recycled ballast in comparison to traditionally very uniform fresh ballast. It was found that recycled ballast can be effectively reused if reinforced with a geocomposite. It was also found that geocomposite can effectively reduce vertical and lateral strains of the ballast with obvious implications for improved track stability and reduced maintenance costs. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i7/p907_s1?isAuthorized=no [article] Field assessment of the performance of a ballasted rail track with and without geosynthetics [texte imprimé] / Buddhima Indraratna, Auteur ; Sanjay Nimbalkar, Auteur ; David Christie, Auteur . - 2010 . - pp. 907-917. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 907-917 Mots-clés : Railroad  tracks  Ballast  Cyclic  loads  Deformation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Understanding the complex mechanisms of stress transfer and strain accumulation in layers of track substructure under repeated wheel loading is essential to predict the desirable track maintenance cycle as well as the design of the new track. Various finite element and analytical techniques have been developed in the past to understand the behavior of composite track layers subjected to repeated wheel loads. The mechanical behavior of ballast is influenced by several factors, including the track confining pressure, type of aggregates, and the number of loading cycles. A field trial was conducted on an instrumented track at Bulli, New South Wales, Australia, with the specific aims of studying the benefits of a geocomposite installed at the ballast-capping interface, and to evaluate the performance of moderately graded recycled ballast in comparison to traditionally very uniform fresh ballast. It was found that recycled ballast can be effectively reused if reinforced with a geocomposite. It was also found that geocomposite can effectively reduce vertical and lateral strains of the ballast with obvious implications for improved track stability and reduced maintenance costs. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i7/p907_s1?isAuthorized=no

Further advancement in filtration criteria through constriction-based techniques / Ashok K. Raut in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N° 6 (Juin 2008) 

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Improved performance of railway ballast under impact loads using shock mats / Sanjay Nimbalkar in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 3 (Mars 2012) 

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Laboratory and finite-element investigation of soil disturbance associated with the installation of mandrel-driven prefabricated vertical drains / Ali Ghandeharioon in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 3 (Mars 2012) 

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Modelling the erosion rate of chemically stabilized soil incorporating tensile force – deformation characteristics / Buddhima Indraratna in Canadian geotechnical journal, Vol. 46 N° 1 (Janvier 2009) 

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Numerical solution of stone column–improved soft soil considering arching, clogging, and smear effects / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 3 (Mars 2013) 

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Performance and prediction of vacuum combined surcharge consolidation at port of brisbane / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 11 (Novembre 2011) 

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Performance of a PRB for the remediation of acidic groundwater in acid sulfate soil terrain / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 7 (Juillet 2010) 

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Predicting the erosion rate of chemically treated soil using a process simulation apparatus for internal crack erosion / Buddhima Indraratna in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N° 6 (Juin 2008) 

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Use of impedance probe for estimation of porosity changes in saturated granular filters under cyclic loading / Laricar Dominic O. Trani in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 10 (Octobre 2010) 

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Vertical and radial consolidation analysis of multilayered soil using the spectral method / Rohan Walker in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 5 (Mai 2009) 

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