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