Alain Robinet
SNCF
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Alain Robinet.
Geotechnical Testing Journal | 2014
Trong Vinh Duong; Yu-Jun Cui; Anh-Minh Tang; Jean-Claude Dupla; Jean Canou; Nicolas Calon; Alain Robinet; B. Chabot; E. De Laure
To study the interlayer creation and the mud-pumping phenomena in the conventional French railway substructure, a physical model was developed with a 160-mm-thick ballast layer overlaying a 220-mm-thick artificial silt layer (mixture of crushed sand and kaolin), both layers being compacted in a transparent cylinder of a 550-mm-inner diameter. One positive pore water pressure sensor, three tensiometers, and three time domain reflectometer (TDR) sensors were installed around the ballast/silt interface allowing the evolution of pore water pressure (negative or positive) and volumetric water content to be monitored, respectively. A digital camera was installed allowing direct monitoring of different movements (ballast, ballast/subsoil interface, etc.). The effects of loading (monotonic and cyclic loadings) and degree of saturation of subsoil (w = 16 %, Sr = 55 %, and near-saturation state) were investigated. It was found that the development of pore water pressure in the subsoil is the key factor causing the migration of fine particles, hence, resulting in the creation of interlayer, as well as mud pumping. In particular, the camera exposed the pumping up level of fine particles during the test, showing that the migration of fine particles was not only a result of the interpenetration of ballast particles and subsoil, but also of the pore water pressure that pushed the fine particle upward. The quality of the recorded data showed that the physical model developed worked well and the test protocol adopted for studying the mechanisms of intermixing of ballast and subsoil and mud pumping was appropriate.
6th Eurasphalt & Eurobitume Congress | 2016
Diego Ramirez Cardona; Hervé Di Benedetto; Cédric Sauzéat; Nicolas Calon; Alain Robinet
The influence of moisture on the thermomechanical properties of bituminous mixtures used for railway trackbeds is addressed in this paper. The use of asphalt base course materials has been identified as a suitable structural solution for the further development of both high-speed and conventional railways, notably in terms of circulation speed and axle load increases. Moreover, field experiences attest a reduction of the maintenance needs by using asphalt concrete in the railway platform. Nevertheless, the available in-situ feedback is not sufficient for observing the long-term degradation of the bituminous layers in railway trackbeds. The evolution of the thermomechanical properties of bituminous mixtures needs then to be characterized for the specific railway working conditions (loading, frequency and environmental exposure). For this, improved 3D tensioncompression tests were performed on mixtures used in railway trackbed. The tests are performed on laboratory-compacted cylindrical asphalt specimens submitted to sinusoidal loading. A moisture conditioning procedure was defined and used to simulate the exposure of the materials to weather conditions. The thermomechanical performances of the materials are compared for the conditioned and non-conditioned states. A multi-parameter analysis allowed determining the effect of moisture exposure on the materials behaviour. The results allowed establishing selection criteria, based on moisture susceptibility and long-term degradation, for bituminous mixtures to be used in railway trackbeds.
Archive | 2012
Trong Vinh Duong; Anh Minh Tang; Yu-Jun Cui; Nicolas Calon; Alain Robinet; Jean-Claude Dupla; Jean Canou
The ancient railways in France, which was initially built by emplacing ballasts directly on the subgrade soils without a separation layer as that for new railway lines, are facing to various problems that affect the stability of trackbed and thus the proper circulation of trains. One of these problems is related to the loss of efficiency in water drainage of the track. Actually, fouled ballast has been formed progressively along the life time of the track mainly due to the infiltration of fine particles of subgrade layer into the ballast layer. In this study, the hydraulic properties of these fine particles investigated. Soil taken from a fouled ballast layer of a rail track was first sieved at 2 mm and then re-compacted to its initial in-situ dry density. The water retention curve and the unsaturated hydraulic conductivity were finally analyzed.
Soils and Foundations | 2012
Viet Nam Trinh; Anh Minh Tang; Yu-Jun Cui; Jean-Claude Dupla; Jean Canou; Nicolas Calon; Lucie Lambert; Alain Robinet; Olivier Schoen
Soils and Foundations | 2013
Trong Vinh Duong; Anh Minh Tang; Yu-Jun Cui; Viet Nam Trinh; Jean-Claude Dupla; Nicolas Calon; Jean Canou; Alain Robinet
Journal of Zhejiang University Science | 2013
Yu-Jun Cui; Trong Vinh Duong; Anh Minh Tang; Jean-Claude Dupla; Nicolas Calon; Alain Robinet
Engineering Geology | 2014
Trong Vinh Duong; Yu-Jun Cui; Anh Minh Tang; Jean-Claude Dupla; Jean Canou; Nicolas Calon; Alain Robinet
Transportation geotechnics | 2014
Yu-Jun Cui; Francisco Lamas-Lopez; Viet Nam Trinh; Nicolas Calon; Sofia Costa D’Aguiar; Jean-Claude Dupla; Anh Minh Tang; Jean Canou; Alain Robinet
Revue Française de Géotechnique | 2011
Viet Nam Trinh; Anh-Minh Tang; Yu-Jun Cui; Jean Canou; Jean-Claude Dupla; Nicolas Calon; Lucie Lambert; Alain Robinet; Olivier Schoen
Acta Geotechnica | 2016
Trong Vinh Duong; Yu-Jun Cui; Anh Minh Tang; Jean-Claude Dupla; Jean Canou; Nicolas Calon; Alain Robinet