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Dynamic train/track interaction: hanging sleepers, track stiffness variations and track settlement
Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
2005 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Trains have been operating on ballasted tracks for over 150 years. During this time demands from the railway organisations and from the industry to increase axle loads and train speeds on the existing railway lines have increased. The reasons for this are both economial and environmental.

Both higher axle loads and train speeds will increase the deterioration rate of the track and cause permanent settlements in the ballast and the underlaying soil. When the track quality decreases beyond certain limits maintenance for relevelling and realignment of the track is necessary, and this is expensive.

The aim of the work presented in this thesis, and of the work performed within the EU project SUstained PErformance of Railway TRACK (SUPERTRACK), is to investigate the dynamic train/track interaction and its effect on track degradation. Less degradation will reduce the maintenance costs regarding track settlement.

The work presented in this thesis focuses on different factors affecting the differential track settlement. By using the finite element method, the dynamic behaviour of a railway track subjected to a moving load has been studied. Dynamic effects of unsupported sleepers and their effect on track settlement have been investigated. Also track stiffness irregularities along the track have been studied, and an optimazation of the track stiffness at a transition zone has been performed.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet , 2005. , 25 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1159
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-24085Local ID: 3649ISBN: 91-8529-935-9 (print)OAI: oai:DiVA.org:liu-24085DiVA: diva2:244402
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-11-05
List of papers
1. Dynamic train/track interaction including model for track settlement evolvement
Open this publication in new window or tab >>Dynamic train/track interaction including model for track settlement evolvement
2004 (English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 41 (Supplement), 667-676 p.Article in journal (Other academic) Published
Abstract [en]

A ballasted railway track exposed to train traffic will degenerate. Track alignment and track level will deteriorate. Settlements of the track (loss of track level and alignment) require maintenance; the track is lifted and aligned, and new ballast material is injected under the sleepers. This paper presents a computer model by which the dynamic train/track interaction can be simulated and the permanent deformation of the track (i.e. track settlements) can be calculated. The voided sleepers ("hanging" sleepers) phenomenon will also be discussed.

Keyword
track settlement, train/track interaction, railway ballast, numerical model
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-100390 (URN)
Available from: 2013-11-05 Created: 2013-11-05 Last updated: 2017-12-06
2. Load impact on railway track due to unsupported sleepers
Open this publication in new window or tab >>Load impact on railway track due to unsupported sleepers
2005 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 219, no 2, 67-77 p.Article in journal (Refereed) Published
Abstract [en]

Ballasted railway tracks will settle as a result of permanent deformations in the ballast and in the underlying material layers. The settlement is caused by the repeated traffic loading and the severity of the settlement depends on the quality and the behaviour of the ballast, the sub-ballast, and the subgrade.

As the behaviour of the material is not exactly the same under all sleepers, and since the loading of the track is irregular, the amount of settlement will differ from one sleeper to another. A result of this is that the sleepers are not always fully supported, and some sleepers may even become completely unsupported (voided). A gap appears between the sleeper and the ballast bed. As soon as the track geometry starts to deteriorate, the variations of the train/track interaction force increase, and this speeds up the track deterioration rate.

This paper presents a computer model by which the dynamic train/track interaction can be simulated. The influence of one or several voided sleepers on the train/track interaction force and on the track dynamics is investigated. Track settlement due to hanging sleeper(s) is discussed.

Keyword
unsupported sleeper, train/track interaction, railway model, track settlement
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-46081 (URN)10.1243/095440905X8790 (DOI)000231159600002 ()
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13
3. Railway track stiffness variation - consequences and countermeasures
Open this publication in new window or tab >>Railway track stiffness variation - consequences and countermeasures
2005 (English)In: 19th IAVSD Symposium of Dynamics of Vehicles on Roads and Tracks, 2005, Milano: Dept Mech Eng, Politecnico di Milano , 2005Conference paper, Published paper (Other academic)
Abstract [en]

The track stiffness experienced by a train will vary along the track. Sometimes the stiffness variation can be very large whitin short distances. These changes in track stiffness will cause variations in the train/track interaction forces, and force variations will normaly imply settlements of the track as a result of permanent deformation in the ballast and in the underlying structure.

Since the behaviour of the ballast and subground material is not exactly the same under all sleepers. and since the loading of the track is irregular. the amount of settlement will differ from one sleeper to another. As soon as the track geometry starts to deteriorate, the variations of the train/track interaction force increase, and this speeds up the track deterioration rate.

This paper discusses how the transition zone between two track stiffnesses should be designed to reduce the track settlement. The transition from one track stiffness to another is optimized to obtain a wheel/rail contact force with as small variations as possible. A smooth wheel/rail contact force at the transition area will minimize the track settlement.

Place, publisher, year, edition, pages
Milano: Dept Mech Eng, Politecnico di Milano, 2005
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-41855 (URN)59253 (Local ID)59253 (Archive number)59253 (OAI)
Conference
19th IAVSD Symposium of Dynamics of Vehicles on Roads and Tracks, Milano, August 29-Seprember 2, 2005
Note

Poster

Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-11-05

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Lundqvist, Andreas

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