Swiss Projects
π
Article
π
2011
π
Wiley (John Wiley & Sons)
π
English
β 475 KB
## Abstract The ChΓ’telard access tunnel for the Nant De Drance pumped storage power station was driven in 2009. The portal represented a great challenge for the designer and the contractor because the railway line from Martigny to Chamonix is only 3 m above the top heading. The support at the porta