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Analyse et modélisation du comportement mécanique de structures de voies ferrées avec sous-couche bitumineuse : Instrumentation de la ligne à grande vitesse Bretagne – Pays de la Loire

Abstract : To improve railways durability, it has been introduced on the HSL BPL (Bretagne-Pays de Loire), a bituminous layer under ballast, intended among other things to reduce the amplitude of the accelerations produced by highspeed trains circulations, which is a major cause of ballast settlement. In order to study the dynamic responses of the different structures, three sections with bituminous underlayment, and a section with a granular sub-layer of BPL track were instrumented. Measurements are monitored remotely. The objective of this thesis is to analyze and model the response of the instrumented sections, and to compare their behavior during the speed up phase and during the commercial service phase. The results indicated good behavior of bituminous sections. The comparison of the accelerations obtained on different sections confirmed the positive effect of the asphalt concrete layer on the stability of the track. Based on the speed up phase measurements, modeling the mechanical response of the various HSL sections using ViscoRail has confirmed the software’s reliability to reproduce the mechanical behavior of railway structures. Temperature measurements, water content and vertical settlements have also confirmed the good seasonal behavior of bituminous structures. Finally, an extension of ViscoRail is put in place, to compare the influence of different types of rail pads, linear and nonlinear, on the response of the track.
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Diana Khairallah. Analyse et modélisation du comportement mécanique de structures de voies ferrées avec sous-couche bitumineuse : Instrumentation de la ligne à grande vitesse Bretagne – Pays de la Loire. Génie civil. École centrale de Nantes, 2019. Français. ⟨NNT : 2019ECDN0026⟩. ⟨tel-02464881⟩

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