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International Journal of Railway Technology
ISSN 2049-5358
IJRT, Volume 6, Issue 3, 2017
Vehicle-Track-Soil Interaction of Isolated, Un-isolated and Damaged Railway Tracks
L. Auersch

Federal Institute of Material Research and Testing, Berlin, Germany

Full Bibliographic Reference for this paper
L. Auersch, "Vehicle-Track-Soil Interaction of Isolated, Un-isolated and Damaged Railway Tracks", International Journal of Railway Technology, 6(3), 21-49, 2017. doi:10.4203/ijrt.6.3.2
Keywords: railway track, track-soil interaction, ground vibration, mitigation, undersleeper pads, finite element method, boundary element method, laboratory tests, field tests, track damage monitoring.

Abstract
This paper deals with two topics of vehicle-track-soil interaction, the mitigation of railway induced ground vibration by soft track elements, and the identification of track damage. Theoretical results have been achieved by a combined finite-element boundary-element method (FEBEM). The theoretical results are confronted with measurements at four sites. Improved mitigation effects have been found for soft rail pads under heavy sleepers. The insertion loss, however, can be too optimistic if a strong vehicle-track resonance occurs for the un-isolated reference track. Two measurement sites show this strong vehicle-track resonance at about 80 Hz, which has been approximated by using the results of a wide parameter study including the rail pad, ballast, and soil stiffness, as well as the ballast model and the soil layering. The detection of slab track damage is mainly based on the differences of the receptance or compliance functions. Theoretical results have been confirmed by measurements at one site where a loss of contact between track plate and base layer was visible. Measurements at a second site with a hidden damage have been compared with the theoretical results of a loose sleeper. The differences between intact (or repaired) and damaged tracks are strong enough to encourage the further development of this method for the identification of track damages.

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