Abstract
The Italian territory is marked by complex geology, morphology and hydrography. For this reason, hydrogeological instability is a primal issue to phenomena such as landslides, flooding and associated erosion phenomena. Within this context, the protection of existing infrastructures plays a significant role along with maintaining operational continuity and promptly restoring circulation after a forced traffic interruption. In October 2020, the railway line Cuneo-Breil-Ventimiglia was interested in a series of landslides and erosion phenomena, due to a sequence of strong meteorological events. The paper presents the study, planning, design and realization of the mitigation measures. An investigation campaign, involving both the existing structures and the geological context, al-lowed to obtain a 3D reconstruction of both the bridges and the nearby slopes, as well as the characterization of materials, the identification of high-risk areas and the design of the solution to reinforce the existing slopes and mitigate the erosion effect on bridges foundations. The software Rocscience Slide has been intensively used for the geotechnical modelling of landslides as well as to design structural works such as soil nailing. Meanwhile, the hydraulic study of the river was performed to assess the hydraulic compatibility of the riverbed construction sites.
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