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O. Barbir, D. Adam, F. Kopf, J. Pistrol, F. Auer, B. Antony:
"Development of condition-based tamping process in railway engineering";
Vortrag: XVI Danube ‐ European Conference on Geotechnical Engineering, Skopje, Mazedonien (eingeladen); 07.06.2018 - 09.06.2018; in: "Proceedings of the 16th Danube ‐ European Conference on Geotechnical Engineering", M. Jovanovski, N. Jankulovski, D. Moslavac, J. Papic (Hrg.); WILEY Ernst & Sohn, Volume 2 (2018), S. 969 - 974.

Ballast, rails and sleepers form an elastic track system. This system is subject to elastic deformation as a consequence of tremendous traffic loadings. When the deformations exceed the elastic limit of the system and the track in no longer laying in its correct geometrical position, precautions, e.g. temporary speed restrictions, have to be taken in order to enable a safe and comfortable travel. Maintaining the track in regular intervals helps restore the initial system geometry, thus preventing possible uneconomical effects. Track maintenance includes levelling, lifting, lining and tamping of the track, hence ensuring rehabilitation of ideal track geometry. This is performed by a tamping machine, with a system of non-synchronous, directional constant pressure tamping, where the tamping tines penetrate the ballast and compact it under the sleeper.
For the purpose of this research project, a tamping machine was equipped with a number of strategically positioned sensors in order to perform the in-situ measurements required to describe the interaction of the tamping tines with the ballast and its compaction beneath the sleeper. With a special emphasis on the energy transferred into the ballast and alteration of ballast stiffness during compaction, conclusions concerning efficiency of the tamping process in different ballast conditions are made, and will be presented in this paper.

Track maintenance, tamping, track ballast compaction

http://dx.doi.org/10.1002/cepa.797

https://publik.tuwien.ac.at/files/publik_270162.pdf