In the world the increasing need of the improvement of the transportation infrastructures led to the construction of twin tunnels at shallow depths. For this reason, the aim of this thesis is to analyse the interaction between two overlapped tunnels changing the construction process. To do that, the project of the metro M5 of Bucharest is taken as reference for the developed 3D and 2D numerical models. The FEM analysis is performed using the software MIDAS FEA NX and PLAXIS 2D. In particular, the ground surface settlement induced by the tunnelling excavation is the main issue of the twin tunnel construction, hence some theories able to describe this problem are highlighted.