The Cimaganda landslide (SO) : hydro-mechanical numerical modelling

The San Giacomo Valley (Sondrio, Italy) as many alpine areas, is quite frequently affected by rock slope landslides at different scales. This work deals with the study of the Cimaganda rockslide which occurred in September 2012 after some days of ordinary rainfall. It involved a rock volume of 20.000 m3 , blocking the main road (SS36) and isolating the municipality of Madesimo and Campodolcino in the upper Valley for few days. The landslide developed at the flank of the historical Cimaganda rockslide, which mobilized some Mm3 of rock. Following a procedural scheme including field and laboratory analysis followed by stress-strain numerical modelling, this work develops a solid conceptual geomechanical model of the area and the back analysis of the 2012 event, exploring instability-forecasting scenarios.