ABSTRACT
The project consists of a 2.200 m long-tunnel, composed of a section in loose ground for about half of its total length and a section in metamorphic rock for the other half. The peculiarity of the portion in loose ground, on which this paper is focused, is that it crosses the town with shallow overburdens, about 10 m at most, running along or under numerous buildings. The rocky part, characterized by higher overburden, up to 100 m approximately, presents an underground roundabout with an overall diameter of 42 m, consisting of a toroidal tunnel with a central rock pillar of 8 m of diameter, for the connection with the future underground parking of Monte San Benedetto.
