Piuro Landslide: 3D Hydromechanical Numerical Modelling of the 1618 Event

The Piuro 1618 landslide represents a well-known case history of large Alpine landslide. It destroyed the ancient village (Italian Bregaglia Valley), renowned as an important trading center between Mediterranean region and Northern Europe. event had significant impact among communities all regions was well documented by chronicles paintings during subsequent decades. However, some aspects, such geometry reconstruction body, location scarp, its dynamics, remained undefined in previous studies, geomechanical characterization failure area is completely missing. Using field laboratory analysis followed stress–strain numerical modelling, this work develops 3D conceptual model slope considering complex geological framework. aim to back-analyze event, defining predisposing triggering factors sliding providing verifications on scar, dynamics. A coupled hydro-mechanical with approach presented, assuming rainfall scenario possible factor. Simulated displacement development deep shear strain localization at depth roughly corresponding that detected surface, allow us highlight mechanical role elements outcropping along validate proposed likely factor for event.