CHAMOISE DUPLICATION

This article describes the construction of the second Chamoise road tunnel under the French Alps. It is part of a project to upgrade to dual carriageway a trunk road between Macon, France and Geneva. The existing 3.62km single-tube Chamoise road tunnel opened in December 1986, and will become the north carriageway after completion of the new tunnel for the south carriageway. Excavation of the south tube began in December 1992 on a divergent alignment, so that the tubes are 73m apart near the middle of the tunnel. The tube's cross section is 97sqm for most of the route, but increases to 140sqm through the three planned 55m long vehicle refuges. Drill + blast techniques are being applied from both the Macon and Geneva sides of the tunnel. The tunnel passes through Marley limestone at its ends and competent limestone in its middle. Cross passages are being installed at 400m intervals, to connect with the pilot tunnel, and there are safety niches at the 200m midpoints. Most of the tunnel has been drilled using Montabert drillrigs, including computerised three-boom rigs for face drilling, and boom and basket rigs for rockbolt drilling.

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  • Corporate Authors:

    THE MINING JOURNAL LTD

    60 WORSHIP STREET
    LONDON,   United Kingdom  EC2A 2HD
  • Authors:
    • THIERY, F
  • Publication Date: 1994-3

Language

  • English

Media Info

  • Pagination: p. 35-6,38
  • Serial:
    • WORLD TUNNELLING
    • Volume: 7
    • Issue Number: 2
    • Publisher: THE MINING JOURNAL LTD
    • ISSN: 0956-8700

Subject/Index Terms

Filing Info

  • Accession Number: 00668078
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Nov 2 1994 12:00AM