MAJOR ROAD TUNNEL PROJECTS - HOW FAR CAN WE GO?

This article considers the main length-limiting elements for road tunnels. Each of the following factors is discussed in terms of the effect of it on road tunnel length: (1) Heading face distance; (2) Site ventilation; (3) Heating-up of the ground; (4) Soil pressures; (5) Risk of inflows under pressure; (6) Deep level geological reconnaissance constraints; (7) Time required for construction; and (8) Construction costs. Other factors are specific to road tunnels: (9) Ventilation and (10) Driver claustrophobia and boredom. The latter factor may eventually be the more restrictive. The conclusion is that none of these factors in and of itself would prevent the construction of road tunnels longer than the Saint-Gothard (16,918m); and that road tunnels may reach 20 km to 25 km. However, only a limited number of sites are available for development of such long road tunnels. Most of the longer road tunnels in the future will be constructed as part of the development of huge urban conglomerations to be criss-crossed underground by interwoven networks. (A)

  • Availability:
  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Marec, M
  • Publication Date: 1996-1

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00723130
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 26 1996 12:00AM