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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 23

Dynamic Characterization of an Unstable Area on a French High Speed Line

S. Costa D'Aguiar1, N. Calon2, Y.J. Cui3, S. Kahil2,3 and O. Néel1

1SNCF Innovation and Research, Paris, France
2SNCF Engineering and Project, Saint-Denis, France
3Université Paris Est, Ecole des Ponts ParisTech Laboratoire Navier, Marne-la-Vallée, France

Full Bibliographic Reference for this paper
S. Costa D'Aguiar, N. Calon, Y.J. Cui, S. Kahil, O. Néel, "Dynamic Characterization of an Unstable Area on a French High Speed Line", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 23, 2016. doi:10.4203/ccp.110.23
Keywords: high-speed railway, ballast instability, in-situ dynamic characterization study, geotechnical study, bender element, numerical simulation.

Summary
The main purpose of this paper is, to present a case study of a high speed line unstable zone and to identify, using geotechnical and accelerometric studies, the main mechanisms contributing to the ballast instability. Understanding the impact of dynamic soil behaviour and measuring its properties on a HSL is a major issue to optimize the maintenance operations. On a long run approach, the aim of this study is to define an investigation methodology which could be applied to future areas with unstable behaviour. The study of this specific case can also lead to better design and appropriate maintenance of the areas with poor soil characteristics.

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