Documents disponibles écrits par cet auteur

Dynamic stress concentrations in lined twin tunnels within fluid-saturated soil / Seyyed M. Hasheminejad in Journal of engineering mechanics, Vol. 134 N° 7 (Juillet 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 N° 7 (Juillet 2008) . - pp.542-554 Titre : Dynamic stress concentrations in lined twin tunnels within fluid-saturated soil Type de document : texte imprimé Auteurs : Seyyed M. Hasheminejad, Auteur ; Reza Avazmohammadi, Auteur Année de publication : 2010 Article en page(s) : pp.542-554 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Stress  Tunnels  Saturated  soils  Three-dimensional  models. Résumé : An exact analysis for three-dimensional dynamic interaction of monochromatic seismic plane waves with two lined circular parallel tunnels within a boundless fluid-saturated porous elastic medium is presented. The novel features of Biot dynamic theory of poroelasticity along with the appropriate wave field expansions, the pertinent boundary conditions, and the translational addition theorems for cylindrical wave functions are employed to obtain a closed-form solution in the form of infinite series. The analytical results are illustrated with numerical examples in which two identical tunnels, lined with concrete and embedded within water-saturated soils of distinct frame properties (i.e., soft or stiff soils), are insonified by plane fast compressional or shear waves at end-on incidence. The basic dynamic field quantities such as the hoop and axial stress amplitudes are evaluated and discussed for representative values of the parameters characterizing the system. The effects of formation material type, angle of incidence, incident wave frequency, and the proximity of the two tunnels on the liner stresses are examined. Particular attention is paid to the influence of bonding and drainage conditions at the liner/soil interface on the dynamic stress concentrations. Limiting cases are considered and good agreement with the solutions available in the literature is obtained. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v134/i7/p542_s1?isAuthorized=no [article] Dynamic stress concentrations in lined twin tunnels within fluid-saturated soil [texte imprimé] / Seyyed M. Hasheminejad, Auteur ; Reza Avazmohammadi, Auteur . - 2010 . - pp.542-554. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N° 7 (Juillet 2008) . - pp.542-554 Mots-clés : Stress  Tunnels  Saturated  soils  Three-dimensional  models. Résumé : An exact analysis for three-dimensional dynamic interaction of monochromatic seismic plane waves with two lined circular parallel tunnels within a boundless fluid-saturated porous elastic medium is presented. The novel features of Biot dynamic theory of poroelasticity along with the appropriate wave field expansions, the pertinent boundary conditions, and the translational addition theorems for cylindrical wave functions are employed to obtain a closed-form solution in the form of infinite series. The analytical results are illustrated with numerical examples in which two identical tunnels, lined with concrete and embedded within water-saturated soils of distinct frame properties (i.e., soft or stiff soils), are insonified by plane fast compressional or shear waves at end-on incidence. The basic dynamic field quantities such as the hoop and axial stress amplitudes are evaluated and discussed for representative values of the parameters characterizing the system. The effects of formation material type, angle of incidence, incident wave frequency, and the proximity of the two tunnels on the liner stresses are examined. Particular attention is paid to the influence of bonding and drainage conditions at the liner/soil interface on the dynamic stress concentrations. Limiting cases are considered and good agreement with the solutions available in the literature is obtained. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v134/i7/p542_s1?isAuthorized=no

Dynamic stress concentrations in lined twin tunnels within fluid-saturated soil / Seyyed M. Hasheminejad in Journal of engineering mechanics, Vol 134 n° 7 (Juillet 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol 134 n° 7 (Juillet 2008) . - pp.542–554 Titre : Dynamic stress concentrations in lined twin tunnels within fluid-saturated soil Type de document : texte imprimé Auteurs : Seyyed M. Hasheminejad, Auteur ; Reza Avazmohammadi, Auteur Année de publication : 2013 Article en page(s) : pp.542–554 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Stress  Tunnel  Saturated  soils  Three-dimensional  models Résumé : An exact analysis for three-dimensional dynamic interaction of monochromatic seismic plane waves with two lined circular parallel tunnels within a boundless fluid-saturated porous elastic medium is presented. The novel features of Biot dynamic theory of poroelasticity along with the appropriate wave field expansions, the pertinent boundary conditions, and the translational addition theorems for cylindrical wave functions are employed to obtain a closed-form solution in the form of infinite series. The analytical results are illustrated with numerical examples in which two identical tunnels, lined with concrete and embedded within water-saturated soils of distinct frame properties (i.e., soft or stiff soils), are insonified by plane fast compressional or shear waves at end-on incidence. The basic dynamic field quantities such as the hoop and axial stress amplitudes are evaluated and discussed for representative values of the parameters characterizing the system. The effects of formation material type, angle of incidence, incident wave frequency, and the proximity of the two tunnels on the liner stresses are examined. Particular attention is paid to the influence of bonding and drainage conditions at the liner/soil interface on the dynamic stress concentrations. Limiting cases are considered and good agreement with the solutions available in the literature is obtained. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A7%2854 [...] [article] Dynamic stress concentrations in lined twin tunnels within fluid-saturated soil [texte imprimé] / Seyyed M. Hasheminejad, Auteur ; Reza Avazmohammadi, Auteur . - 2013 . - pp.542–554. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol 134 n° 7 (Juillet 2008) . - pp.542–554 Mots-clés : Stress  Tunnel  Saturated  soils  Three-dimensional  models Résumé : An exact analysis for three-dimensional dynamic interaction of monochromatic seismic plane waves with two lined circular parallel tunnels within a boundless fluid-saturated porous elastic medium is presented. The novel features of Biot dynamic theory of poroelasticity along with the appropriate wave field expansions, the pertinent boundary conditions, and the translational addition theorems for cylindrical wave functions are employed to obtain a closed-form solution in the form of infinite series. The analytical results are illustrated with numerical examples in which two identical tunnels, lined with concrete and embedded within water-saturated soils of distinct frame properties (i.e., soft or stiff soils), are insonified by plane fast compressional or shear waves at end-on incidence. The basic dynamic field quantities such as the hoop and axial stress amplitudes are evaluated and discussed for representative values of the parameters characterizing the system. The effects of formation material type, angle of incidence, incident wave frequency, and the proximity of the two tunnels on the liner stresses are examined. Particular attention is paid to the influence of bonding and drainage conditions at the liner/soil interface on the dynamic stress concentrations. Limiting cases are considered and good agreement with the solutions available in the literature is obtained. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A7%2854 [...]

Elastic Wave Scattering by Two Spherical Inclusions in a Poroelastic Medium / Seyyed M. Hasheminejad in Journal of engineering mechanics, vol.131, N° 9 (Septembre 2005) 

Public ISBD [article]  in Journal of engineering mechanics > vol.131, N° 9 (Septembre 2005) . - 953-965 p. Titre : Elastic Wave Scattering by Two Spherical Inclusions in a Poroelastic Medium Titre original : Vague Elastique Dispersant par Deux Inclusions Sphériques dans un Milieu de Poroelastic Type de document : texte imprimé Auteurs : Seyyed M. Hasheminejad, Auteur ; Badsar, Seyyed A., Auteur Article en page(s) : 953-965 p. Note générale : Génie Civil, Génie Mécanique Langues : Anglais (eng) Mots-clés : Elasticity  Poroelasticity  Scattering  Compression  waves  Porous  media  Elasticité  Poroélasticité  Dispersion  Vagues  de  compression  Média  poreux Index. décimale : 624/621.34 Résumé : This Study considers the most fundamental problem of multiple scattering in a poroelastic medium.~It treats the interaction of a plane compressional elastic wave with a cluster of two of spherical inhomogeneities in a boundless fluid-saturated porous elastic formation. The Novel features of Biot classic model for dynamic description of poroelastic material behavior along with the appropriate wave field expansion, the pertinent boundary conditions, and the translational addition theorems for spherical wave functions are employed to develop a closed-form solution in the form of infinite series. The Analytical results are illustrated with numerical examples in which a pair of spherical inclusions is insonified by a plane (fast) compressional wave at end-on incidence. The Effects of incident wave frequency, proximity of the two inclusions, and inclusion type are examined. Particular attention has been focused on multiple scattering interactions in addition to the slow wave coupling effects which is known to be the primary distinction of the scattering phenomenon in poroelasticity from the classical elastic case. The Limiting case involving two elastic spheres submerged in an ideal unbounded fluid medium is considered and fair agreement with a well-known solution is established. Cette étude considère le problème le plus fondamental de multiple dispersant en festins poroelastic d'un medium.~It l'interaction d'une vague élastique de compression d'avion avec un faisceau de deux d'inhomogénéités sphériques dans une formation élastique poreuse fluide-saturée illimitée. Les dispositifs de roman du modèle classique de Biot pour la description dynamique du comportement matériel poroelastic avec l'expansion appropriée de champ de vague, les conditions de frontière convenables, et les théorèmes de translation d'addition pour des fonctions sphériques de vague sont utilisés pour développer une solution de forme close sous forme de série infinie. Les résultats analytiques sont illustrés avec les exemples numériques dans lesquels une paire d'inclusions sphériques est insonified par une vague de compression (rapide) d'avion à extrémité-sur l'incidence. Les effets de la fréquence de vague d'incident, de la proximité des deux inclusions, et du type d'inclusion sont examinés. Une attention particulière a été concentrée sur des interactions multiples de dispersion en plus des effets lents d'accouplement de vague qui est connue pour être la distinction primaire du phénomène de dispersion dans le poroelasticity du cas élastique classique. Le cas de limitation impliquant deux sphères élastiques a submergé dans un milieu liquide illimité idéal est considéré et l'accord juste avec une solution bien connue est établi. En ligne : hashemi@iust.ac.ir, ali_badsar@mail.iust.ac.ir [article] Elastic Wave Scattering by Two Spherical Inclusions in a Poroelastic Medium = Vague Elastique Dispersant par Deux Inclusions Sphériques dans un Milieu de Poroelastic [texte imprimé] / Seyyed M. Hasheminejad, Auteur ; Badsar, Seyyed A., Auteur . - 953-965 p. Génie Civil, Génie Mécanique Langues : Anglais (eng) in Journal of engineering mechanics > vol.131, N° 9 (Septembre 2005) . - 953-965 p. Mots-clés : Elasticity  Poroelasticity  Scattering  Compression  waves  Porous  media  Elasticité  Poroélasticité  Dispersion  Vagues  de  compression  Média  poreux Index. décimale : 624/621.34 Résumé : This Study considers the most fundamental problem of multiple scattering in a poroelastic medium.~It treats the interaction of a plane compressional elastic wave with a cluster of two of spherical inhomogeneities in a boundless fluid-saturated porous elastic formation. The Novel features of Biot classic model for dynamic description of poroelastic material behavior along with the appropriate wave field expansion, the pertinent boundary conditions, and the translational addition theorems for spherical wave functions are employed to develop a closed-form solution in the form of infinite series. The Analytical results are illustrated with numerical examples in which a pair of spherical inclusions is insonified by a plane (fast) compressional wave at end-on incidence. The Effects of incident wave frequency, proximity of the two inclusions, and inclusion type are examined. Particular attention has been focused on multiple scattering interactions in addition to the slow wave coupling effects which is known to be the primary distinction of the scattering phenomenon in poroelasticity from the classical elastic case. The Limiting case involving two elastic spheres submerged in an ideal unbounded fluid medium is considered and fair agreement with a well-known solution is established. Cette étude considère le problème le plus fondamental de multiple dispersant en festins poroelastic d'un medium.~It l'interaction d'une vague élastique de compression d'avion avec un faisceau de deux d'inhomogénéités sphériques dans une formation élastique poreuse fluide-saturée illimitée. Les dispositifs de roman du modèle classique de Biot pour la description dynamique du comportement matériel poroelastic avec l'expansion appropriée de champ de vague, les conditions de frontière convenables, et les théorèmes de translation d'addition pour des fonctions sphériques de vague sont utilisés pour développer une solution de forme close sous forme de série infinie. Les résultats analytiques sont illustrés avec les exemples numériques dans lesquels une paire d'inclusions sphériques est insonified par une vague de compression (rapide) d'avion à extrémité-sur l'incidence. Les effets de la fréquence de vague d'incident, de la proximité des deux inclusions, et du type d'inclusion sont examinés. Une attention particulière a été concentrée sur des interactions multiples de dispersion en plus des effets lents d'accouplement de vague qui est connue pour être la distinction primaire du phénomène de dispersion dans le poroelasticity du cas élastique classique. Le cas de limitation impliquant deux sphères élastiques a submergé dans un milieu liquide illimité idéal est considéré et l'accord juste avec une solution bien connue est établi. En ligne : hashemi@iust.ac.ir, ali_badsar@mail.iust.ac.ir