GROUND MOVEMENTS DUE TO TUNNELLING IN HARD ROCKS. ENGINEERING GEOLOGY OF UNDERGROUND MOVEMENTS. PROCEEDINGS OF THE 23RD ANNUAL CONFERENCE OF THE ENGINEERING GROUP OF THE GEOLOGICAL SOCIETY, NOTTINGHAM UNIVERSITY, SEPTEMBER 13-17, 1987

Movements caused by tunnel construction in continuous and discontinuous hard rock are discussed briefly and generally in relation to typical topographic and effective ground stress conditions. Larger displacements are found in open-jointed rocks at shallow depth, and adjacent to tunnels built too close to steep valley walls where stress conditions are adverse. In deep tunnels, where the ground stresses are sufficiently adverse to cause local rock failure, convergence controlled by supports allows the rock to dilate locally and attenuates the movements away from the tunnel. Reference is made to a special form of upward collapse in unsupported tunnels at moderate depth, which may migrate to the surface in discontinuous rocks with near-vertical joint sets and thin, near-horizontal and weak bedding, in the long-term. Two case records are given of water at high pressure in adjoining strata causing bursting of intervening rock into tunnels, one from above the tunnel and one from below.(a) for the covering abstract of the conference see IRRD 823385.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0903317419
• Corporate Authors:

  GEOLOGICAL SOCIETY

  BURLINGTON HOUSE, PICCADILLY
  LONDON,   United Kingdom  W1V 0JU
• Authors:
  • Ward, W H
• Publication Date: 1988

Language

• English

Media Info

• Pagination: p. 63-69
• Serial:
  • Publication of: Geological Society, England
  • Publisher: GEOLOGICAL SOCIETY

Subject/Index Terms

• TRT Terms: Conferences; Excavation; Excavations; Failure; Motion; Rocks; Stresses; Tunnels
• Uncontrolled Terms: Heaving
• Subject Areas: Bridges and other structures; Data and Information Technology; Geotechnology;

Filing Info

• Accession Number: 00498580
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-903317-41-9
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM