The new Bözberg Tunnel is part of the so-called “4-Metre Corridor” on the northern access route to the new Gotthard Base Tunnel. After the new tunnel has been completed, freight can be transported in...

An important milestone for the 4 m corridor: On 29 November 2017, the tunnel boring machine broke through the last few metres of the Bözberg in Effingen. Due to the presence of unstable rock at the...

This year’s Geomechanics Colloquium held by the Austrian Society for Geomechanics (ÖGG) from October 12 to 13, 2017 in Salzburg was again one of the top events in its field in the German-language...

Until now, segment-lined tunnels in low mountain formations have been constructed with one layer of pressure-tight lining, with sealing being provided by elastomer gasket profiles. The application limit of this method of construction is about 5 bar. If the water pressure is higher, a much more elaborate and thus more expensive double-shell construction with an additional drainage layer between the inner and outer lining is necessary. In the recent past, a solution for this problem in mechanised tunnelling with segment lining has often been discussed in the specialist world: a drainage layer of permeable material for annular gap grouting. This would then make the installation of an additional inner lining with drainage layer no longer necessary.

The French Tunnelling and Underground Space Association AFTES (L’Association Français des Tunnels et de l’Espace Souterrain) held its international congress from November 13 to 16, 2017 in the Palais...

For the third time in a row – after 2015 in Switzerland and 2016 in Singapore – the world of tunnelling celebrated itself and its achievements. The occasion was provided by the AFTES Congress on...