Measurements of transient ground movements below a ballasted railway line


Priest, J.A., Powrie, W., Yang, L.A., Grabe, P.J. and Clayton, C.R.I. (2010) Measurements of transient ground movements below a ballasted railway line Geotechnique, 60, (9), pp. 667-677. (doi:10.1680/geot.7.00172).

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Description/Abstract

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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1680/geot.7.00172
ISSNs: 0016-8505 (print)
Keywords: in situ testing, dynamics, field instrumentation, deformation, monitoring, numerical modelling
Subjects: T Technology > TF Railroad engineering and operation
Organisations: Civil Engineering & the Environment
ePrint ID: 74495
Date :
Date Event
9 April 2010e-pub ahead of print
September 2010Published
Date Deposited: 11 Mar 2010
Last Modified: 09 Jun 2017 11:33
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/74495

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