[article] 
inGéotechnique > Vol. 60 N° 9 (Septembre 2010) . - pp. 667–677

Titre :	Measurements of transient ground movements below a ballasted railway line
Type de document :	texte imprimé
Auteurs :	J. A. Priest, Auteur ; W. Powrie, Auteur ; L. Yang, Auteur
Année de publication :	2011
Article en page(s) :	pp. 667–677
Note générale :	Génie Civil
Langues :	Anglais (eng)
Mots-clés :	In situ testing Dynamics Field instrumentation Deformation Monitoring Numerical modelling
Index. décimale :	624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes
Résumé :	This paper presents the results of a detailed investigation into the ground deformations that occur under a railway line during the passage of a train. Four horizontal boreholes were installed at different depths below a ballasted railway track. Ground deformations were measured using geophones at set distances from the centreline of the track within each borehole. The results show vertical displacements reducing with depth, from a maximum at the sleeper. Sleeper displacements are dominated by pairs of bogies at the ends of adjacent wagons (which have a frequency of loading 1 Hz), although the effects of individual bogies (2 Hz) and axles (6 Hz) are also apparent. Higher loading frequencies attenuate with depth so that at a depth of 0·780 m below the sleeper soffit no axles are visible within the displacement data and by a depth of 1·98 m only the combined effect of pairs of adjacent bogies is apparent. In contrast, longitudinal horizontal motion is greatest at a depth of 0·78 m below the sleeper soffit, and the longitudinal horizontal displacements at the sleeper and at a depth of 0·78 m are dominated by the individual axles (∼6 Hz). By a depth of 1·98 m, the longitudinal horizontal motion is dominated by the bogie pairs. A dynamic linear-elastic two-dimensional finite element model was developed and validated using the measured displacements.
DEWEY :	624.15
ISSN :	0016-8505
En ligne :	http://www.icevirtuallibrary.com/content/article/10.1680/geot.7.00172

[article] Measurements of transient ground movements below a ballasted railway line [texte imprimé] / J. A. Priest, Auteur ; W. Powrie, Auteur ; L. Yang, Auteur . - 2011 . - pp. 667–677.
Génie Civil
Langues : Anglais (eng)
in Géotechnique > Vol. 60 N° 9 (Septembre 2010) . - pp. 667–677

Mots-clés :	In situ testing Dynamics Field instrumentation Deformation Monitoring Numerical modelling
Index. décimale :	624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes
Résumé :	This paper presents the results of a detailed investigation into the ground deformations that occur under a railway line during the passage of a train. Four horizontal boreholes were installed at different depths below a ballasted railway track. Ground deformations were measured using geophones at set distances from the centreline of the track within each borehole. The results show vertical displacements reducing with depth, from a maximum at the sleeper. Sleeper displacements are dominated by pairs of bogies at the ends of adjacent wagons (which have a frequency of loading 1 Hz), although the effects of individual bogies (2 Hz) and axles (6 Hz) are also apparent. Higher loading frequencies attenuate with depth so that at a depth of 0·780 m below the sleeper soffit no axles are visible within the displacement data and by a depth of 1·98 m only the combined effect of pairs of adjacent bogies is apparent. In contrast, longitudinal horizontal motion is greatest at a depth of 0·78 m below the sleeper soffit, and the longitudinal horizontal displacements at the sleeper and at a depth of 0·78 m are dominated by the individual axles (∼6 Hz). By a depth of 1·98 m, the longitudinal horizontal motion is dominated by the bogie pairs. A dynamic linear-elastic two-dimensional finite element model was developed and validated using the measured displacements.
DEWEY :	624.15
ISSN :	0016-8505
En ligne :	http://www.icevirtuallibrary.com/content/article/10.1680/geot.7.00172