CCD Grande Dixence | Switzerland

Excavation diameter

5.81-4.80-4.4 m

Tunnel length

10,600 m


Mica schists

Type of support

Prefabricated segments

Completed in



EOS (L’Energie de l’Ouest-Suisse)

One of the longest inclined shafts ever constructed with two shielded TBMs and innovative transport systems.

After a year of technical discussions with the best European competition, the two critical lots in this project were entrusted to SELI Overseas, as part of a joint venture with local partners.

For the excavation of the 2.5 km inclined tunnel, new technologies for transporting excavated material were developed and implemented.

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