Water in tunnels represents a challenge in any geological condition. When dealing with cohesive
material, this aspect might bring additional problems linked to the low permeability, which does 
not allow effective and quick drainage to stabilize the ground around the tunnel. Ordinary draina-
ge systems are an effective method, especially in higher permeability grounds, but these are losing 
efficacy in soft clays. This paper focuses on an innovative technique for stabilizing the tunnel face 
and surrounding ground...