THE CHANNEL TUNNEL: GEOTECHNICAL MONITORING TO BREAKTHROUGH

The structure and route of the Channel Tunnel are outlined and the geology of the ground through which it has been constructed discussed in more detail. Details are then given of the geotechnical monitoring that has been carried out during construction such as vertical seismic profiling. Works requiring monitoring have included a large terminal area, 100km of underland and undersea tunnels and a coastal reclamation area adjacent to the main site. Extensive probing has been carried out from the service tunnels ahead of the main running tunnel drives in order to monitor water ingress, penetration rate and flush and rock cuttings. Downward vertical probing from the rear of the TBM and sideways probing to the crown of running tunnels has also been carried out. The frequency of monitoring depended on the problems anticipated from work on the service tunnel with particular attention being paid to high risk areas such as the Fosse Dangearde area. Regular geological logging of the exposed face and sidewall area was also carried out.

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• Corporate Authors:

  GEOLOGICAL SOCIETY PUBLISHING HOUSE

  UNIT 7, BRASSMILL ENTERPRISE CENTRE, BRASSMILL LANE
  BATH,   United Kingdom  BA1 3JN
• Authors:
  • Warren, C D
  • VARLEY, P M
• Publication Date: 1992

Language

• English

Media Info

• Features: References;
• Pagination: p. 7-16
• Serial:
  • ENGINEERING GEOLOGY
  • Volume: 25
  • Issue Number: 1
  • Publisher: Elsevier
  • ISSN: 0013-7952

Subject/Index Terms

• TRT Terms: Bridges; Excavation; Excavations; Fixed routes; Geology; Geophysics; Tunnels; Underwater tunnels
• Uncontrolled Terms: Site investigation
• Geographic Terms: France; United Kingdom
• ITRD Terms: 5155: Excavation (process); 3363: Fixed link (transmaritime); 8036: France; 4053: Geology; 5742: Geophysics; 5722: Site investigation; 3374: Tunnel; 8119: United Kingdom
• Subject Areas: Bridges and other structures; Geotechnology;

Filing Info

• Accession Number: 00631007
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jul 1 1993 12:00AM