Ground subsidence caused by Genoa Tunnel

The generated alerts allow the identification of conditions that may go unnoticed by the in-situ instrumentation deployed on the surface. 

This case study shows the evolution of ground subsidence in and around the San Martino district during the construction of an overflow tunnel in Genoa (Italy). The tunnel was excavated from the coast to the north under a densely built-up area with large building complexes where significant cumulative displacements of up to 30 mm were detected during the tunnel excavation. Until mid-2016, there were no records of displacement in this area.

Automatic alerts generated by Detektia show how subsidence shifts northwards from mid-2016 to the end of 2017, coinciding with the advance of the tunnelling front. Ground stabilization occurred in an interval of five to six months depending on the area affected.

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