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Evaluating railway track support stiffness from trackside measurements in the absence of wheel load data

Evaluating railway track support stiffness from trackside measurements in the absence of wheel load data
Evaluating railway track support stiffness from trackside measurements in the absence of wheel load data
It is generally accepted that track support stiffness is a major factor controlling rates of track geometry deterioration, particularly where the track support stiffness changes abruptly. There is, therefore, considerable potential benefit in being able to quantify and detect changes in the track support stiffness. In recent years, trackside techniques using various types of transducer have been developed to determine track deflections as trains pass. However, deducing the track support stiffness from these measurements requires assumptions to be made concerning train loading and track behaviour, and scope for different interpretations remains. For example, loads from moving trains vary dynamically and it is not usually feasible to measure their exact values at any given point along the track. This paper presents new methods of analysis, which can be applied to frequency spectra of track displacement, velocity or acceleration generated as trains pass to calculate the track support stiffness for trains of known axle intervals, without needing to know the actual loads applied. The approach is demonstrated with reference to theory and measured data from a range of field sites.
0008-3674
1156-1166
Le Pen, Louis
4a38e256-d113-4bba-b0d4-32d41995928a
Milne, David
6b321a45-c19a-4243-b562-517a69e5affc
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Le Pen, Louis
4a38e256-d113-4bba-b0d4-32d41995928a
Milne, David
6b321a45-c19a-4243-b562-517a69e5affc
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c

Le Pen, Louis, Milne, David, Thompson, David and Powrie, William (2016) Evaluating railway track support stiffness from trackside measurements in the absence of wheel load data. Canadian Geotechnical Journal, 53 (7), 1156-1166. (doi:10.1139/cgj-2015-0268).

Record type: Article

Abstract

It is generally accepted that track support stiffness is a major factor controlling rates of track geometry deterioration, particularly where the track support stiffness changes abruptly. There is, therefore, considerable potential benefit in being able to quantify and detect changes in the track support stiffness. In recent years, trackside techniques using various types of transducer have been developed to determine track deflections as trains pass. However, deducing the track support stiffness from these measurements requires assumptions to be made concerning train loading and track behaviour, and scope for different interpretations remains. For example, loads from moving trains vary dynamically and it is not usually feasible to measure their exact values at any given point along the track. This paper presents new methods of analysis, which can be applied to frequency spectra of track displacement, velocity or acceleration generated as trains pass to calculate the track support stiffness for trains of known axle intervals, without needing to know the actual loads applied. The approach is demonstrated with reference to theory and measured data from a range of field sites.

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Accepted/In Press date: 18 February 2016
e-pub ahead of print date: 18 February 2016
Published date: July 2016
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 391563
URI: http://eprints.soton.ac.uk/id/eprint/391563
ISSN: 0008-3674
PURE UUID: c6a6b049-718c-45f1-be84-bd7f56c6af6d
ORCID for Louis Le Pen: ORCID iD orcid.org/0000-0002-4362-3895
ORCID for David Milne: ORCID iD orcid.org/0000-0001-6702-3918
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906
ORCID for William Powrie: ORCID iD orcid.org/0000-0002-2271-0826

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Date deposited: 13 Apr 2016 09:01
Last modified: 28 Apr 2022 02:21

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