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The interpretation and representation of the ground materials distribution and of their properties is a fundamental task in engineering geology practice. Engineering geological models can help to plan and developed the site investigation activities as they constitute an idealization of the ground, quite useful during the office and field tasks. The selection of the site investigation techniques can be more efficient when a ground model is idealized or sketched. The interpretation of the site investigation data mus...

A case study concerning a drystone retaining wall that failed during construction, is presented. The site geology, the materials and their geotechnical characteristics are documented and discussed. The detailed site investigation performed allowed to define three geotechnical units: 1 - anthropogenic deposits; 2 - quaternary alluvial and colluvial deposits; 3 - Neogene alluvial fan. The third geotechnical unit, the Neogene alluvial fan, is mainly composed by dense and very dense sands, showed the best geotechnical...