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Load impact on railway track due to unsupported sleepers
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
2005 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, 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.

Place, publisher, year, edition, pages
2005. Vol. 219, no 2, 67-77 p.
Keyword [en]
unsupported sleeper, train/track interaction, railway model, track settlement
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-46081DOI: 10.1243/095440905X8790ISI: 000231159600002OAI: oai:DiVA.org:liu-46081DiVA: diva2:266977
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2013-11-05
In thesis
1. Dynamic train/track interaction: hanging sleepers, track stiffness variations and track settlement
Open this publication in new window or tab >>Dynamic train/track interaction: hanging sleepers, track stiffness variations and track settlement
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:nbn:se:liu:diva-24085 (URN)3649 (Local ID)91-8529-935-9 (ISBN)3649 (Archive number)3649 (OAI)
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-11-05

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Lundqvist, AndreasDahlberg, Tore

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