Documents disponibles écrits par cet auteur

Experimental geomechanics / Mohamed Aris in European journal of environmental and civil engineering, Vol. 16 N° 1 (Janvier 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 1 (Janvier 2012) . - pp. 97-110 Titre : Experimental geomechanics : A laboratory study on the behaviour of granular material using bender elements Type de document : texte imprimé Auteurs : Mohamed Aris, Auteur ; Nadia Benahmed, Auteur ; Stéphane Bonelli, Auteur Année de publication : 2012 Article en page(s) : pp. 97-110 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Granular  materials  Microstructure  Inherent  and  induced  anisotropy  Triaxial  test  Bender  elements Résumé : On the basis of three methods of preparing well-differentiated triaxial Hostun HN31 sand specimens, namely moist tamping, dry pluviation and water pluviation, we highlight the influence of the reconstitution mode on the mechanical behaviour of sand. Piezoelectric transducers (bender elements) were installed in a triaxial cell and at the lateral edges of the sample in different directions (HH and HV) to investigate the structural anisotropy caused by each deposition mode and its evolution during undrained shearing tests, by measuring shear wave velocities. The results confirm and enrich the observations made with the scanning electron microscope and triaxial apparatus used by Benahmed, 2001; Benahmed, Canou & Dupla, 2004 on loose sand prepared using two different reconstitution procedures. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668031 [article] Experimental geomechanics : A laboratory study on the behaviour of granular material using bender elements [texte imprimé] / Mohamed Aris, Auteur ; Nadia Benahmed, Auteur ; Stéphane Bonelli, Auteur . - 2012 . - pp. 97-110. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 1 (Janvier 2012) . - pp. 97-110 Mots-clés : Granular  materials  Microstructure  Inherent  and  induced  anisotropy  Triaxial  test  Bender  elements Résumé : On the basis of three methods of preparing well-differentiated triaxial Hostun HN31 sand specimens, namely moist tamping, dry pluviation and water pluviation, we highlight the influence of the reconstitution mode on the mechanical behaviour of sand. Piezoelectric transducers (bender elements) were installed in a triaxial cell and at the lateral edges of the sample in different directions (HH and HV) to investigate the structural anisotropy caused by each deposition mode and its evolution during undrained shearing tests, by measuring shear wave velocities. The results confirm and enrich the observations made with the scanning electron microscope and triaxial apparatus used by Benahmed, 2001; Benahmed, Canou & Dupla, 2004 on loose sand prepared using two different reconstitution procedures. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.668031

Investigating concentrated leak erosion behaviour of cohesive soils by performing hole erosion tests / Nadia Benahmed in European journal of environmental and civil engineering, Vol. 16 N° 1 (Janvier 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 1 (Janvier 2012) . - pp. 43-58 Titre : Investigating concentrated leak erosion behaviour of cohesive soils by performing hole erosion tests Type de document : texte imprimé Auteurs : Nadia Benahmed, Auteur ; Stéphane Bonelli, Auteur Année de publication : 2012 Article en page(s) : pp. 43-58 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Internal  erosion  Piping  Experimental  study  Cohesive  soils  Critical  shear  stress  Rate  of  erosion  Hydraulic  works Résumé : Internal erosion by piping is one of the common causes of failure of embankment dams and dykes. This phenomenon occurs when preferential flow paths develop in the earthfill or foundation; through these water flows, carrying away particles of soil and leading to the formation and the evolution of a continuous ‘pipe’ between the upstream and the downstream side. A series of hole erosion tests were conducted on cohesive soils in order to quantify critical shear stress and the coefficient of erosion: white kaolinite, proclay kaolinite and a hostun sand/proclay kaolinite mixture. The effects of compaction energy, moisture content, degree of saturation and the percentage of fines were investigated. The experimental results show that these parameters play a key role in the erosion characteristics. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667667 [article] Investigating concentrated leak erosion behaviour of cohesive soils by performing hole erosion tests [texte imprimé] / Nadia Benahmed, Auteur ; Stéphane Bonelli, Auteur . - 2012 . - pp. 43-58. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 1 (Janvier 2012) . - pp. 43-58 Mots-clés : Internal  erosion  Piping  Experimental  study  Cohesive  soils  Critical  shear  stress  Rate  of  erosion  Hydraulic  works Résumé : Internal erosion by piping is one of the common causes of failure of embankment dams and dykes. This phenomenon occurs when preferential flow paths develop in the earthfill or foundation; through these water flows, carrying away particles of soil and leading to the formation and the evolution of a continuous ‘pipe’ between the upstream and the downstream side. A series of hole erosion tests were conducted on cohesive soils in order to quantify critical shear stress and the coefficient of erosion: white kaolinite, proclay kaolinite and a hostun sand/proclay kaolinite mixture. The effects of compaction energy, moisture content, degree of saturation and the percentage of fines were investigated. The experimental results show that these parameters play a key role in the erosion characteristics. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667667

Micromechanical modeling of internal erosion / Stéphane Bonelli in European journal of environmental and civil engineering, Vol. 15 N° 8 (Août 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 8 (Août 2011) . - pp. 1207-1224 Titre : Micromechanical modeling of internal erosion Titre original : Modélisation micromécanique de l'érosion interne Type de document : texte imprimé Auteurs : Stéphane Bonelli, Auteur ; Didier Marot, Auteur Année de publication : 2012 Article en page(s) : pp. 1207-1224 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Internal  erosion  Suffusion  Interfacial  erosion  Homogenization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Suffusion is the internal erosion process by which finer soil particles are detached from the solid matrix, and transported through constrictions by seepage flow. At the macroscopic scale, this is a bulk erosion process and corresponds to a source term in the mass balance equations. This paper constitutes a step towards bridging the gap between the counter intuitive bulk erosion model and our intuition that erosion is essentially an interfacial process. We suggest that a framework within suffusion can be viewed as a clay/water interface erosion at the microsopic scale. The coefficient of surface erosion appears to be a relevant parameter for the suffusion bulk erosion law. The comparison between the results of the present modeling study and previously published experimental data supports the validity of our approach. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16708 [article] Micromechanical modeling of internal erosion = Modélisation micromécanique de l'érosion interne [texte imprimé] / Stéphane Bonelli, Auteur ; Didier Marot, Auteur . - 2012 . - pp. 1207-1224. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 8 (Août 2011) . - pp. 1207-1224 Mots-clés : Internal  erosion  Suffusion  Interfacial  erosion  Homogenization Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Suffusion is the internal erosion process by which finer soil particles are detached from the solid matrix, and transported through constrictions by seepage flow. At the macroscopic scale, this is a bulk erosion process and corresponds to a source term in the mass balance equations. This paper constitutes a step towards bridging the gap between the counter intuitive bulk erosion model and our intuition that erosion is essentially an interfacial process. We suggest that a framework within suffusion can be viewed as a clay/water interface erosion at the microsopic scale. The coefficient of surface erosion appears to be a relevant parameter for the suffusion bulk erosion law. The comparison between the results of the present modeling study and previously published experimental data supports the validity of our approach. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16708

Numerical modeling of suffusion as an interfacial erosion process / Frédéric Golay in European journal of environmental and civil engineering, Vol. 15 N° 8 (Août 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° 8 (Août 2011) . - pp. 1225-1241 Titre : Numerical modeling of suffusion as an interfacial erosion process Titre original : Modélisation numérique de la suffusion comme une érosion interfaciale Type de document : texte imprimé Auteurs : Frédéric Golay, Auteur ; Stéphane Bonelli, Auteur Année de publication : 2012 Article en page(s) : pp. 1225-1241 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Suffusion  Internal  erosion  Finite  volume  Level-set  Interface  Fictitious  domain Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Suffusion is an internal erosion process which occurs when finer soil particles are detached by seepage flow and start moving within the pore space of larger particles. Suffusion can be viewed as clay/water interface erosion. The aim of this study is to use a numerical model for simulating surface erosion occurring at a fluid/soil interface subject to a flow process at pore scale. Balance equations with jump relations are used. A penalization procedure including a fictitious domain method is used to compute the Stokes flow around obstacles, in order to avoid body-fitted unstructured meshes and instead use fast and efficient finite volume approximations on Cartesian meshes. The evolution of the water/soil interface is described by using a level-set function. The ability of the model to predict suffusion is confirmed by several numerical simulations. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16709 [article] Numerical modeling of suffusion as an interfacial erosion process = Modélisation numérique de la suffusion comme une érosion interfaciale [texte imprimé] / Frédéric Golay, Auteur ; Stéphane Bonelli, Auteur . - 2012 . - pp. 1225-1241. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° 8 (Août 2011) . - pp. 1225-1241 Mots-clés : Suffusion  Internal  erosion  Finite  volume  Level-set  Interface  Fictitious  domain Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Suffusion is an internal erosion process which occurs when finer soil particles are detached by seepage flow and start moving within the pore space of larger particles. Suffusion can be viewed as clay/water interface erosion. The aim of this study is to use a numerical model for simulating surface erosion occurring at a fluid/soil interface subject to a flow process at pore scale. Balance equations with jump relations are used. A penalization procedure including a fictitious domain method is used to compute the Stokes flow around obstacles, in order to avoid body-fitted unstructured meshes and instead use fast and efficient finite volume approximations on Cartesian meshes. The evolution of the water/soil interface is described by using a level-set function. The ability of the model to predict suffusion is confirmed by several numerical simulations. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16709