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  The complex design of two tunnels under archaeological remnants in urban area: planning and measurements of a particular case

  The paper deals with the design of twin tunnels, currently under construction, connecting the existing Municipio Station access shaft (interchange node between Metro Line 6 and Metro Line 1 extension project in Naples, Italy) to the TBM extraction shaft located nearly 40 m far from it. The two short tunnels have to underpass archaeological findings consisting in fortification walls built in the sixteenth century, through a subsoil composed by a loose silty sand overlying a soft and sometimes fractured rock (Neapolitan Yellow Tuff) and below the groundwater table.

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