Tunnel Sous le Mont, Tavannes

Trunk road tunnel with two-way traffic flow, 1,222 m in length (1,137 m mined), 1 emergency bay. The plant utility channel also serves as an escape gallery.

Machine-assisted heading in hard rock, calotte-driven, construction support measures (pipe roof umbrella and forepoling with spiles).


Specific figures

Order value

CHF 70,78 million

Construction period

2007 - 2012


1137 m

Total excavated surface

115 m2