Monitoring of railway structures of high-speed line BPL with bituminous and granular sublayers
Résumé
The phenomena of packing and wear of ballast, under dynamic stresses lead to high frequencies and high costs of maintenance. To mitigate this problem, an innovative track structure, with an asphalt concrete layer under the ballast was built on the Bretagne-Pays de la Loire high-speed line (BPL HSL). It is intended, among other things, to reduce the amplitude of the accelerations produced at the passage of High-Speed Trains (HST), major cause of ballast settlements. BPL HSL includes 105 km with an asphalt concrete sub-layer under the ballast, and 77 km with a granular sub-layer. In order to study the dynamic responses of these different structures, four track sections were instrumented using, among others, accelerometers, strain gauges, temperature probes, etc. In this paper, we present the tracks' instrumentation, the acquisition system installed to collect all the measurements, as well as comparative results of dynamic and mechanical behavior between structures since July 2017, the inauguration of the BPL HSL to commercial traffic.
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