Selection of tunnelling methods at the Gotthard Base Tunnel / Wahl der Vortriebsmethoden am Gotthard-Basistunnel
|Issue:||"Geomechanics and Tunnelling", 2011, n. 5 v. 4|
For the construction of the longest rail tunnel in the world, the selection of the optimal method of tunnelling was of considerable importance. Not only the ground properties were decisive for the decision but also other constraints, like for example the environmental requirements or the access to intermediate starting points. In two of the five sections, the employer had essential grounds for the specification of tunnelling method, but in three of the five sections, there were no essential grounds in the view of the employer. The selection of tunnelling method was therefore decided by economic criteria as the result of competition between the international bidders in the tendering phase. In the end, TBMs were used in all three sections.
|Keywords:||risk analysis, excavation methods, TBM drive, drill and blast, project requirements|