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J.N. Varandas¹, B. Correia², A. Paixão³ and E. Fortunato³

¹CERIS, ICIST, Civil Engineering Department, Nova University of Lisbon, Portugal
²Civil Engineering Department, Nova University of Lisbon, Portugal
³Transportation Department, National Laboratory for Civil Engineering, Lisbon, Portugal

Keywords: railway transitions, train-track interaction, uneven track, critical velocity, three-dimensional modelling.

Summary

The support conditions of railway tracks usually continuously vary along the longitudinal direction of the track. On the free track, this variation is caused by the varying geotechnical properties of foundation layers, varying embankment heights, cut and fill transitions, passage over culverts, existence of switches and crossings, transition zones to bridges or tunnels, which many times result in differential settlements and hanging sleepers. In view of this, important stiffness variations are not restricted to locations where special technical blocks were built, such as at the entrance to bridges or switches. The existence of local soil deposits or when the railway line needs to cross small valleys are examples of inhomogeneous scenarios corresponding to local changes of the track support with potential impact on the train-track interaction. This paper shows how situations of inhomogeneous track support corresponding to local deposits of soils with different geotechnical properties may influence the train-track-support system response. The case-study is defined from the available data from a recently built railway line in Portugal, which included a stiffness evaluation and the track geometry measurements. A numerical model of the selected case-study is then built using a three-dimensional finite element dynamic analysis tool, considering the train-track-ballast-soil interaction and coupling.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 198 Dynamic Train-Track Interaction over Inhomogeneous Foundations J.N. Varandas¹, B. Correia², A. Paixão³ and E. Fortunato³ ¹CERIS, ICIST, Civil Engineering Department, Nova University of Lisbon, Portugal ²Civil Engineering Department, Nova University of Lisbon, Portugal ³Transportation Department, National Laboratory for Civil Engineering, Lisbon, Portugal doi:10.4203/ccp.110.198 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Dynamic Train-Track Interaction over Inhomogeneous Foundations", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 198, 2016. doi:10.4203/ccp.110.198 Keywords: railway transitions, train-track interaction, uneven track, critical velocity, three-dimensional modelling. Summary The support conditions of railway tracks usually continuously vary along the longitudinal direction of the track. On the free track, this variation is caused by the varying geotechnical properties of foundation layers, varying embankment heights, cut and fill transitions, passage over culverts, existence of switches and crossings, transition zones to bridges or tunnels, which many times result in differential settlements and hanging sleepers. In view of this, important stiffness variations are not restricted to locations where special technical blocks were built, such as at the entrance to bridges or switches. The existence of local soil deposits or when the railway line needs to cross small valleys are examples of inhomogeneous scenarios corresponding to local changes of the track support with potential impact on the train-track interaction. This paper shows how situations of inhomogeneous track support corresponding to local deposits of soils with different geotechnical properties may influence the train-track-support system response. The case-study is defined from the available data from a recently built railway line in Portugal, which included a stiffness evaluation and the track geometry measurements. A numerical model of the selected case-study is then built using a three-dimensional finite element dynamic analysis tool, considering the train-track-ballast-soil interaction and coupling. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
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