Documents disponibles écrits par cet auteur

Experimental study of the earth pressure distribution on cylindrical shafts / Tatiana Tobar in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 11 (Novembre 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 11 (Novembre 2011) . - pp. 1121-1125 Titre : Experimental study of the earth pressure distribution on cylindrical shafts Type de document : texte imprimé Auteurs : Tatiana Tobar, Auteur ; Mohamed A. Meguid, Auteur Année de publication : 2012 Article en page(s) : pp. 1121-1125 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Vertical  shafts  Soft  ground  Axisymmetric  earth  pressure  Physical  models  Cylindrical  retaining  walls Résumé : This paper describes the results from an experimental program that has been conducted to investigate the distribution of earth pressure on a cylindrical wall embedded in granular material and subjected to radial displacement. The model shaft has been designed and built using mechanically adjustable segments to control the magnitude and uniformity of the wall movement during the tests. A series of experiments have been performed, and the progressive changes in earth pressure along the shaft have been continuously measured for different wall displacements. Results indicated a rapid decrease in lateral earth pressure when a small wall movement was introduced. When the wall movement reached about 2.5% of the shaft radius, the earth pressure distribution along the shaft became uniform and independent of any additional wall displacement. The experimental results are also compared with some of the available theoretical solutions, and the applicability of these solutions is then examined. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i11/p1121_s1?isAuthorized=no [article] Experimental study of the earth pressure distribution on cylindrical shafts [texte imprimé] / Tatiana Tobar, Auteur ; Mohamed A. Meguid, Auteur . - 2012 . - pp. 1121-1125. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 11 (Novembre 2011) . - pp. 1121-1125 Mots-clés : Vertical  shafts  Soft  ground  Axisymmetric  earth  pressure  Physical  models  Cylindrical  retaining  walls Résumé : This paper describes the results from an experimental program that has been conducted to investigate the distribution of earth pressure on a cylindrical wall embedded in granular material and subjected to radial displacement. The model shaft has been designed and built using mechanically adjustable segments to control the magnitude and uniformity of the wall movement during the tests. A series of experiments have been performed, and the progressive changes in earth pressure along the shaft have been continuously measured for different wall displacements. Results indicated a rapid decrease in lateral earth pressure when a small wall movement was introduced. When the wall movement reached about 2.5% of the shaft radius, the earth pressure distribution along the shaft became uniform and independent of any additional wall displacement. The experimental results are also compared with some of the available theoretical solutions, and the applicability of these solutions is then examined. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i11/p1121_s1?isAuthorized=no

Investigation of tunnel-soil-pile interaction in cohesive soils / Mohamed A. Meguid in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 7 (Juillet 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 7 (Juillet 2009) . - pp. 973–979 Titre : Investigation of tunnel-soil-pile interaction in cohesive soils Type de document : texte imprimé Auteurs : Mohamed A. Meguid, Auteur ; Joe Mattar, Auteur Année de publication : 2009 Article en page(s) : pp. 973–979 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Tunneling  Piles  Soil-structure  interaction  Cohesive  soils Résumé : Underground tunnels are considered to be a vital infrastructure component in most cities around the world. Careful planning is always necessary to ensure minimum impact on nearby surface and subsurface structures. This study describes the experimental investigation carried out to examine the effect of existing piles installed in cohesive soil and extended to bedrock on the circumferential stresses developing in a newly constructed tunnel supported by a flexible lining system. A small scale testing facility was designed and built to simulate the process of tunnel excavation and lining installation in the close vicinity of preinstalled model piles. Lining stresses were measured for different separation distances between the lining and the existing piles Consistent decrease in the lining load was observed when the piles are located within a distance of one tunnel diameter from the tunnel. The results presented in this study indicated that measuring the lining response near existing pile foundations may be used to evaluate the extent of the interaction between the lining and the surrounding piles. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000004 [article] Investigation of tunnel-soil-pile interaction in cohesive soils [texte imprimé] / Mohamed A. Meguid, Auteur ; Joe Mattar, Auteur . - 2009 . - pp. 973–979. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 7 (Juillet 2009) . - pp. 973–979 Mots-clés : Tunneling  Piles  Soil-structure  interaction  Cohesive  soils Résumé : Underground tunnels are considered to be a vital infrastructure component in most cities around the world. Careful planning is always necessary to ensure minimum impact on nearby surface and subsurface structures. This study describes the experimental investigation carried out to examine the effect of existing piles installed in cohesive soil and extended to bedrock on the circumferential stresses developing in a newly constructed tunnel supported by a flexible lining system. A small scale testing facility was designed and built to simulate the process of tunnel excavation and lining installation in the close vicinity of preinstalled model piles. Lining stresses were measured for different separation distances between the lining and the existing piles Consistent decrease in the lining load was observed when the piles are located within a distance of one tunnel diameter from the tunnel. The results presented in this study indicated that measuring the lining response near existing pile foundations may be used to evaluate the extent of the interaction between the lining and the surrounding piles. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000004