Eppenberg Tunnel

Switzerland

This railway tunnel is part of a project to improve the rail infrastructure in the Swiss canton of Solothurn. The main goal of the tunnel is to increase capacity in the narrow passage between Aarau and Olten.

Construction method: TBM-tunnel driven with convertible TBM in hard rock as well as in soft rock (slurry mode), shield diameter 12.75 m;  double lining with tunnel segments as outer lining and in-situ concrete lining with external sealing as inner lining each with a thickness of 30 cm. The rescue tunnels are constructed in mining technique.