Tracking the space-time evolution of a karstic system with fast dissolution kinetics developed in gypsum formations
Etude de l'évolution spatio-temporelle des systèmes karstiques à cinétique de dissolution rapide, développés dans les formations de type évaporitique
Résumé
The wood of la Tussion, near Paris is affected by a certain number of surface collapses of the sinkhole type. The lack of knowledge on the phenomenon for the formation and evolution of these sinkholes of natural origin is a factor, which prevents the application of suitable protective solutions. To develop this knowledge, INERIS in July 2009 engaged into a hydrogeological and geotechnical study of this area. This study has the goal of evaluating the "ground movement" risk. As these are evolutive phenomena, it is necessary to have extensive knowledge of the hydrogeological operation of the site, the subterranean water flows being at the origin of the dissolution. The results of this study give the possibility of better targeting the areas to be treated and the nature of the work to be applied to allow safe access to the visitors of this park