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Abstract: The extension of the line 1 of the Milan Subway to the N-E outskirts of city involved the execution of 4 bored tunnels for a global length nearly 2 km in difficult geotechnical and hydrogeological context. The tunnels are built using conventional tunneling systems with a partial-face excavation. The work was found to be extremely complex for the presence of incoherent soil (sand and gravel) in...