Effects on the Aquifer During the Realization of Underground Railway Works in Turin

The “Underground Railway Link” of Turin (Piedmont, Italy), in the section between Porta Susa and Corso Grosseto stations, represented a work with no small difficulties in planning and execution, in fact it has entailed the difficult problem of crossing through an underpass the Dora Riparia River with a double artificial tunnels. The potential interference of this work with unconfined aquifer has necessitated a complete hydrogeological investigation aimed at the design of a monitoring plan for the entire line of action, compatible with the presence of road and railway surface network as well as sub-systems directly interconnected to these. Monitoring, still in place, started from August 2005, with a series of campaigns of detection given by manual acquisition and since November 2006 has been implemented with the installation of data logger. The monitoring system has provided for the control of the variation of the groundwater level ante operam, during construction and post operam in order to control in detail the development and the process of hydrodynamic adaptation of the aquifer system to the new structure in the succession of the different implementation phases.