This article describes the construction of three road tunnels between Bern and Lausanne on the N1 motorway from the east to the west of Switzerland. The tunnels are all twin tunnels with a typical excavation diameter of nearly 12.0m; they all pass through the high hills east of Lake Neuchatel, and demonstrate the difficulties of Swiss mountain terrain. The 1830m long Les Vignes twin tunnel has been excavated with a digger shield, able to work in a pressurised chamber if necessary; it passes through alluvial sediment and sandstone. The 2880m long Arrissoules twin tunnel is being drilled by a Robbins Model 352-128 tunnel boring machine (TBM), and passes through medium to hard sandstones. The Pomy tunnel has parallel tubes of lengths 2667m and 2623m, and is being bored by a Herrenknecht TBM; it passes through sandstone, chalk, and gypsum. Other engineering works in the area include: the short Tunnel des Bruyeres, the cut-and-cover Les Combettes Tunnel, and many high bridges and viaducts.

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    LONDON,   United Kingdom  EC2A 2HD
  • Authors:
    • HACKEL, A
  • Publication Date: 1996-8


  • English

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Filing Info

  • Accession Number: 00729752
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 26 1996 12:00AM