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Shallow earth translational slides and earth flows, affecting colluvial soils derived by the weathering of the clayey bedrock, are a recurrent problem causing damage to buildings and roads in many areas of Apennines. The sus- ceptibility assessment, e.g. slope stability models, requires the preliminary characterization of these superficial covers (lithology, geotechnical and hydraulic parameters). The aim of the work is to develop and test a methodology for the identification and mapping of weathered clayey soils responsible for shallow landslides. A test site in Northern Apennines (Province of Pavia) was selected. Argillaceous and marly successions characterize the area. Shallow landslides occurred periodically due to high intensity rainfalls. Trench pits were used for the soil profile description (lithology, structure, grade of weathering, thickness) and sampling. The main geological, topographic and geomorphologic parameters of shallow landslides were analysed. Field surveys were integrated with some geotech- nical laboratory tests (index properties, suction and volumet- ric characteristic determination, methylene blue adsorption test, linear shrinkage, swell strain). Engineering geological zoning was carried out by group- ing the superficial soils on the basis of the following at- tributes: topographic conditions (slope angle), landslide oc- currence, lithology (grain size), geometry (thickness), lithol- ogy of the bedrock, hydrogeological and geotechnical char- acteristics. The resulting engineering-geological units (areas that may be regarded as homogeneous from the geomorpho- logic and engineering - geological point of view) were anal- ysed in terms of shallow slope instability.

Characterisation of weathered clayey soils responsible for shallow landslides