Al shaer, Ali (2005) Permanent settlement analysis of ballasted railway tracks - Dynamical approach. PhD thesis, ENPC.
Abstract
The study of ballasted railway tracks behaviour under moving trains at high speeds is one of the most important researches in the domain of transport. Due to repeated passage of trains at high speeds, differential settlements are observed in the longitudinal direction of the railway track.
These settlements depend on the platform quality, the rolling speed and the dynamical behaviour of the track. They can threaten the comfort and the security of passengers and need high costs of maintenance in order to return the track into its initial position. In order to progress in understanding the phenomenon of settlement, a reduced scale experiment of three sleepers is proposed. Sleepers are submitted into analytical forces of shape M by hydraulic jacks representing loads due to the passage of boogies. This experiment allows to measure several parameters such as displacements, accelerations and stresses in the embankment. It is modelled by the finite element method with linear elastic behaviours and two different zones of ballast (compacted and non compacted).
Numerical results are determined by three-dimensional modeling and then compared to the experimental ones. The essential aim of this experiment is to establish a permanent settlement law for a large number of cycles depending on a dynamical parameter that can be determined by the three-dimensional numerical model.
| Item Type: | PhD Thesis (PhD) |
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| Thesis Supervisor: | Duhamel, D. |
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| Date: | 2005 |
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| Board of examiners: | Sab, K. and Le houedec, D. and Modaressi, A. and Schmitt, L. and Hornych, P. and Duhamel, D. |
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| Collection (Fonds): | ENPC |
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| Institution: | ENPC |
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| Subjects: | 4. Materials Science, Mechanics and Mechanical Engineering |
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| Uncontrolled Keywords: | Railway track, Trains, Ballast, High speeds -experiment, Reduced scale, Dynamics, Finite elements, Elastic linear modeling, Settlement, Voie ferrée, Trains, Ballast, Grandes vitesses, Essai, échelle réduite, Dynamique, éléments finis, Modèle élastique linéaire, Tassement. |
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