Uso di una apparecchiatura innovativa per la parametrizzazione geotecnica finalizzata a verifiche di stabilità delle coperture detritiche

On November 2014 a very intense rainfall caused several shallow landslides in the area of Leivi (Liguria, Northern Italy). The considered slope consists of shallow debris overlying an impermeable bedrock. Debris characterization was carried out by means of direct shear tests: large samples were carried out using a large shear box (300 × 300 × 100 mm). The samples were reconstituted in the laboratory using the materials collected just above the sliding surface of two landslide. The direct shear tests were performed to determine the effective strength parameters (cohesion and friction angle) according to different water content. The results of direct shear tests showed that the friction angle values decrease and the cohesion increases, as water content increases. The reconstructed geotechnical parameters were used to perform stability analyses along longitudinal slope sections. The characteristic of the slope were reconstructed by geological, geomorphological and seismic surveys. The stability analyses were carried out using the limit equilibrium method.