A preliminary study of the parameters influencing the perfomance of two-component backfill grout
In the mechanized tunnelling with Tunnel Boring Machines (TBM), the filling process of the tail void that is created simultaneously to the advancement of the TBM between the excavation profile and the extrados of the precast concrete segments of the final lining takes on particular importance. The effectiveness of this operation depends on the injection methods and the mechanical characteristics of the injected material, which is crucial for the success of the excavation, the correct positioning of the lining elements and the reduction of the effects induced on the surface (settlements).