REVISING TERZAGHI'S TUNNEL ROCK LOAD COEFFICIENTS

Field experience and measured rock loads have shown that the massive steel ribs required by Terzaghi's coefficients are overly heavy, conservative and costly. The steel ribs used in Europe in association with the NATM shotcrete and rock bolts are very slender and lightweight. The risk associated with revising Terzaghi's 1946 coefficients and providing more slender, lightweight steel ribs in tunnels is clearly not significant. Using the revised curve (which changes only rock classes 4, 5 and 6 and does not apply to the special cases of squeezing or swelling ground) costs might be reduced on USA tunnels to approach costs of tunnels now being built in Europe and Japan. For the covering abstract of the symposium see IRRD 284392. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0895202972
• Supplemental Notes:
  • Issues in Rock Mechanics. Proceedings of the 23rd Symposium on Rock Mechanics, University of California, Berkeley, August 25-27, 1982.
• Corporate Authors:

  American Institute of Mining, Mettalurgy & Petroleum Engineers

  345 East 47th Street
  New York, NY  United States  10017
• Authors:
  • Rose, D
• Conference:
  • Issues in Rock Mechanics. Proceedings of the 23rd Symposium on Rock Mechanics, University of California, Berkeley, August 25-27, 1982.
• Publication Date: 1982

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 953-960

Subject/Index Terms

• TRT Terms: Conferences; Construction management; Costs; Depth perception; Rock mechanics; Shotcrete; Specifications; Steel; Structural design; Technology; Terzaghi's rule; Tunnel lining; Tunnel supports; Tunnels; Weight
• Identifier Terms: New Austrian Tunneling Method
• Uncontrolled Terms: Modifications; Support (Tunnel); Tunnel design
• Geographic Terms: Europe; Japan; United States
• ITRD Terms: 8525: Conference; 3666: Construction method; 224: Cost; 8034: Europe; 9048: Modification; 177: Specifications; 4542: Steel; 3605: Timbering; 3374: Tunnel; 8122: USA; 5485: Weight
• Subject Areas: Bridges and other structures; Construction; Design; Finance; Geotechnology; Highways; Public Transportation; I25: Design of Tunnels;

Filing Info

• Accession Number: 00452611
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0 89520 297 2
• Files: ITRD, TRIS
• Created Date: Aug 27 2004 9:59PM