Tunnelling at TGV speed
Several months earlier than planned, on February 25, 2013 tunnel boring machine Charlotte completed excavation for the two tubes of the »Tunnel de Saverne«. During the tunnelling of the second tube, the site teams achieved a record performance of 1,014 meters in 30 days. Overall, the TBM completed a distance of nearly eight kilometers in hard and unconsolidated rock. The rail tunnel is part of the section on the TGV Paris-Strasbourg line currently being expanded.
After the breakthrough of the first tunnel, the machine was disassembled and set up ready to go again at the launch portal near Ernolsheim lès Saverne. In late September 2012 "Charlotte" began with the excavation of the southern tube. During the five months of tunnelling, the site teams exceeded their daily best performances of the first tube: in one month they achieved a record performance of 1,014 meters in 30 days.