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7 results on '"Ducreau, Alain"'

1. Monitoring of Railway Structures of High-Speed Line Bretagne-Pays de la Loire with Bituminous and Granular Sublayers

Author

Khairallah, Diana, Blanc, Juliette, Hornych, Pierre, Cottineau, Louis-Marie, Chupin, Olivier, Piau, Jean-Michel, Ramirez Cardona, Diego, Ducreau, Alain, Savin, Frederic, Di Benedetto, Hervé, editor, Baaj, Hassan, editor, Chailleux, Emmanuel, editor, Tebaldi, Gabriele, editor, Sauzéat, Cédric, editor, and Mangiafico, Salvatore, editor

Published
2022
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4. Monitoring and modeling of railway structures of the high-speed line BPL with asphalt concrete underlayment

Author

Khairallah, Diana, Chupin, Olivier, BLANC, Juliette, Hornych, Pierre, Piau, Jean Michel, Ramirez Cardona, Diego, DUCREAU, Alain, SAVIN, Frédéric, Laboratoire Auscultation, Modélisation, Expérimentation des infrastructures de transport (MAST-LAMES ), Université Gustave Eiffel, Groupe Eiffage, SNCF Réseau [La Plaine st Denis], Setec ferroviaire Group, and parent

Subjects
BETON BITUMINEUX, RAIL, PAYS DE LA LOIRE, MODELISATION, BALLASTED RAILWAYS, [SPI.MAT]Engineering Sciences [physics]/Materials, BALLAST, ASPHALT CONCRETE, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, ENROBE, SURVEILLANCE, RAILWAYS MODELING, VOIE FERREE, MONITORING, CHEMIN DE FER (VOIE), CONTROLE, BRETAGNE
Abstract

High-speed railway lines design and durability constitute major challenges in the railway transportation field. In France, a 40-year feedback on field behaviour of ballasted tracks led to improvement of the design rules. Settlement and wear of ballast, caused by dynamic stresses at high frequency, however remains a major problem on high-speed tracks leading to high maintenance costs. Studies have shown that these settlements were linked to the high accelerations produced in the ballast layer by high-speed trains traveling on the track, disrupting the granular assembly. The high-speed line "Bretagne - Pays de la Loire" (BPL HSL), with varied subgrade conditions, represents the first large-scale application of asphalt concrete (GB) as ballast sublayer. This line includes 77 km of conventional track with a granular sub-layer (UGM) and 105 km of track with an asphalt concrete sub-layer under the ballast. Four track sections were instrumented during construction using, among others, accelerometers, anchored deflection sensors and strain gages. This paper presents the instrumentation as well as the acquisition system installed on the track. Data processing is explained first, and followed by a presentation of the ViscoRail software, developed for modelling railway tracks. The bituminous section's behavior and response is modelled using a multi-layer dynamic response model, implemented in the ViscoRail software. A good match between experimental and calculated results is highlighted.

Published
2020

7. Influence of the Bituminous Layer on Temperature and Water Infiltration in Railway Structures of the Bretagne-Pays de la Loire High-Speed Line.

Author

Khairallah, Diana, Blanc, Juliette, Hornych, Pierre, Piau, Jean-Michel, Cottineau, Louis-Marie, Pouget, Simon, Ducreau, Alain, Savin, Frederic, and Hosseingholian, Mohsen

Abstract

The phenomena of settlement and wear of the ballast under dynamic stresses lead to high frequencies and high maintenance costs on high-speed railway lines. Studies have shown that these settlements are linked to high accelerations produced in the ballast by the passage of high-speed trains (HST). A layer of asphalt concrete (GB) was introduced under the ballast layer on the high-speed line Bretagne-Pays de Loire (BPL HSL). It is intended, among other things, to reduce the amplitude of accelerations produced at the passage of the HST and thus improve the durability of the track. The BPL HSL spans 105 km, with a sublayer of asphalt concrete under the ballast and 77 km with a granular sublayer (UGM). To evaluate the performance of the structures with bituminous sublayer and to compare it with traditional structures with granular sublayer, four track sections have been instrumented during construction. This article presents the different sensors of the instrumentation, as well as the acquisition system installed to collect measurements. The focus, in this study, concerns the temperature, water content, and vertical settlement measurements made on the instrumented sections. Temperature variations recorded during two years on the railway structure with bituminous sublayer were analyzed and compared with those measured on a classical bituminous pavement. Influence of the bituminous layer on water infiltration and track settlements has also been studied. [ABSTRACT FROM AUTHOR]

Published
2020
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