Determination of dynamic track modulus from measurement of track velocity during train passage
Determination of dynamic track modulus from measurement of track velocity during train passage
The measurement of track stiffness, or track modulus, is an important parameter for assessing the condition of a railway track. This paper describes a method by which the dynamic track modulus can be determined from the dynamic displacements of the track during normal train service, measured using geophones. Two techniques are described for calculating the track modulus—the inferred displacement basin test (DBT) method and a modified beam on an elastic foundation (BOEF) method. Results indicate that the viscoelastic response of the soil will influence the value of track modulus determined using the DBT method. The BOEF method was therefore used to calculate the apparent increase in axle load due to train speed. Hanging or partly supported sleepers were associated with a relatively small increase in dynamic axle loads with train speed.
railroad tracks, stiffness, velocity, dynamic loads, measurement
1732-1740
Priest, J. A.
e1acfbf6-3099-41e1-be51-da92e1fdb1a5
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
November 2009
Priest, J. A.
e1acfbf6-3099-41e1-be51-da92e1fdb1a5
Powrie, W.
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Priest, J. A. and Powrie, W.
(2009)
Determination of dynamic track modulus from measurement of track velocity during train passage.
Journal of Geotechnical and Geoenvironmental Engineering, 135 (11), .
(doi:10.1061/(ASCE)GT.1943-5606.0000130).
Abstract
The measurement of track stiffness, or track modulus, is an important parameter for assessing the condition of a railway track. This paper describes a method by which the dynamic track modulus can be determined from the dynamic displacements of the track during normal train service, measured using geophones. Two techniques are described for calculating the track modulus—the inferred displacement basin test (DBT) method and a modified beam on an elastic foundation (BOEF) method. Results indicate that the viscoelastic response of the soil will influence the value of track modulus determined using the DBT method. The BOEF method was therefore used to calculate the apparent increase in axle load due to train speed. Hanging or partly supported sleepers were associated with a relatively small increase in dynamic axle loads with train speed.
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Published date: November 2009
Keywords:
railroad tracks, stiffness, velocity, dynamic loads, measurement
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Local EPrints ID: 75864
URI: http://eprints.soton.ac.uk/id/eprint/75864
ISSN: 1090-0241
PURE UUID: 60077314-c624-4f4b-aa2e-740f3b02c0f1
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Date deposited: 12 Mar 2010
Last modified: 14 Mar 2024 02:38
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Author:
J. A. Priest
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