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Abstract: The Vedeggio-Cassarate road tunnel is part of the new Transportation Plan of the city of Lugano (PTL), in the southern part of Switzerland. A section of about 200 m was excavated in soft ground, which presents a very heterogeneous sequence of quaternary glacial lake and fluvial sediments, with artesian groundwater horizons at many different independent levels with pressures reaching up to 20 m...