ABSTRACT
The Aquitaine Basin is a sedimentary basin widely compounded by karstic limestones aged from Jurassic to Oligocene series. Throughout years and particularly in future, designers would have to consider resilient structures regarding climate changes that, for instance, emphases karst issues. A methodology based on hydraulic and geological criteria, is provided to assess karst collapse hazard. Applied to a roadway study-case (Departmental Road n°1215), the methodology carries on a set of disposals to ensure the robustness of the design and is about to be published in a Cerema/BRGM guidelines textbook (Cerema & BRGM 2023). Amongst them, a strengthening of the road by a geosynthetics is designed according to the French standards. The importance of the karst diameter and the limiting value of the accepted deformation of the roadway structure, on the required strength resistance of the geosynthetics is enlighten. That confirms the relevance of the methodology to assess a reasonable hazard.
