ABSTRACT
On the evening of December 3, 2007, an impressive and sudden collapse affected the Reggio Calabria portal of the St. Antonino tunnel. The collapse, which mobilized about 500,000 cubic meters, led to the complete failure of the twin-tube tunnel that had reached about 180 meters. The geological model involves clayey rock in a particularly articulated tectonic structure. To this complex geological scenario it was possible to attribute the cause of the phenomenon. The recovery and completion of tunnels was highly demanding, due to the poor mechanical characteristics of the collapsed ground and to the detection of metal and concrete elements and construction machineries involved in the original tunnel collapse.
The upstream tunnel was completed the May 18, 2018.
