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Monitoring and repair of isolated trackbed defects on a ballasted railway

Monitoring and repair of isolated trackbed defects on a ballasted railway
Monitoring and repair of isolated trackbed defects on a ballasted railway
Ballasted railway track suffers from a gradual loss of vertical geometry (level) as a result of settlements caused by trafficking and differences in support conditions. However, certain trackbed defects giving rise to a particularly rapid and severe loss of geometry are often localised, and possibly associated with zones of inadequate or variable support stiffness. Conventional line-tamping (usually by machine) may not be effective for these isolated trackbed defects. This paper demonstrates, with reference to three particular defect sites on a ballasted railway in the UK, the benefits in terms of both effectiveness and longevity of a more targeted repair strategy at such locations. First, track-based instrumentation was used to assess the nature and extent of the defect and to identify differential support stiffness conditions, which might also need to be addressed. The data were then used to inform repair strategy; for example, deflections measured during train passage were used to specify the thickness of shims placed between the rail pad and the sleeper. Finally, the track-based instrumentation was used to monitor the effectiveness and longevity of the repair, providing evidence that adequate support conditions had been restored. At the three defect sites investigated, the localised repairs are shown to be more effective and longer-lived than conventional line-tamping.
2214-3912
61-68
Milne, David
6b321a45-c19a-4243-b562-517a69e5affc
Le Pen, Louis
4a38e256-d113-4bba-b0d4-32d41995928a
Watson, Geoff
a7b86a0a-9a2c-44d2-99ed-a6c02b2a356d
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Hayward, Mick
4553e8eb-7662-4579-919c-907e4d4306c7
Morley, Simon
09369c6a-a67c-43ed-9e08-f4d486919ed6
Milne, David
6b321a45-c19a-4243-b562-517a69e5affc
Le Pen, Louis
4a38e256-d113-4bba-b0d4-32d41995928a
Watson, Geoff
a7b86a0a-9a2c-44d2-99ed-a6c02b2a356d
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Powrie, William
600c3f02-00f8-4486-ae4b-b4fc8ec77c3c
Hayward, Mick
4553e8eb-7662-4579-919c-907e4d4306c7
Morley, Simon
09369c6a-a67c-43ed-9e08-f4d486919ed6

Milne, David, Le Pen, Louis, Watson, Geoff, Thompson, David, Powrie, William, Hayward, Mick and Morley, Simon (2018) Monitoring and repair of isolated trackbed defects on a ballasted railway. Transportation Geotechnics, 17 (Part A), 61-68. (doi:10.1016/j.trgeo.2018.09.002).

Record type: Article

Abstract

Ballasted railway track suffers from a gradual loss of vertical geometry (level) as a result of settlements caused by trafficking and differences in support conditions. However, certain trackbed defects giving rise to a particularly rapid and severe loss of geometry are often localised, and possibly associated with zones of inadequate or variable support stiffness. Conventional line-tamping (usually by machine) may not be effective for these isolated trackbed defects. This paper demonstrates, with reference to three particular defect sites on a ballasted railway in the UK, the benefits in terms of both effectiveness and longevity of a more targeted repair strategy at such locations. First, track-based instrumentation was used to assess the nature and extent of the defect and to identify differential support stiffness conditions, which might also need to be addressed. The data were then used to inform repair strategy; for example, deflections measured during train passage were used to specify the thickness of shims placed between the rail pad and the sleeper. Finally, the track-based instrumentation was used to monitor the effectiveness and longevity of the repair, providing evidence that adequate support conditions had been restored. At the three defect sites investigated, the localised repairs are shown to be more effective and longer-lived than conventional line-tamping.

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Accepted/In Press date: 1 September 2018
e-pub ahead of print date: 14 September 2018
Published date: 1 December 2018

Identifiers

Local EPrints ID: 423770
URI: http://eprints.soton.ac.uk/id/eprint/423770
ISSN: 2214-3912
PURE UUID: 94a32fbd-8fad-4fed-85eb-159c993437c6
ORCID for David Milne: ORCID iD orcid.org/0000-0001-6702-3918
ORCID for Louis Le Pen: ORCID iD orcid.org/0000-0002-4362-3895
ORCID for Geoff Watson: ORCID iD orcid.org/0000-0003-3074-5196
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: 01 Oct 2018 16:30
Last modified: 07 Oct 2020 06:33

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