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Abstract: Metro Milan line 2 was built in 1967 without considering waterproofing details. In late 90’s water table rose by many meters in a matter of a few years. Subsequently high rates of water inflow were observed in the tunnels. For instance, in 2015 the rate measured in the Lambrate-Piola Tunnels was up to 700m³/hour. Several attempts carried out with cementitious or resin injections were...