VIEILLISSEMENT DES GÉOTEXTILES-FILTRES DANS LES OUVRAGES DE DRAINAGE - AUSCULTATION DU DISPOSITIF EXPÉRIMENTAL DE ROISSARD AGEING OF GEOTEXTILES USED IN DRAINAGE WORKS - MONITORING OF ROISSARD EXPERIMENTAL DRAINING TRENCHES

Risks related to geofilters ageing used in drainage are very important in the context of landslides stabilization engineering and dams and dikes design. "DrainAgeing" project aims to a better understanding and prevention of drains ageing and clogging. This paper is about the state of progress of the project and the results of 17 years monitoring of Roissard experimental draining trenches. We conclude about the perspectives expected by the excavation and the analysis of geotextiles and geomaterials during the next second phase of the project.