A FRACTURE TOUGHNESS TESTING SYSTEM FOR PREDICTION OF TUNNEL BORING MACHINE PERFORMANCE

This paper describes part of an ongoing analytical/experimental programme aimed at evaluating fracture toughness in order to predict tunnel boring machine (tbm) performance. The programme includes efforts to: 1) provide a firm analytical basis for a test specimen geometry: the core-derived short-rod; 2) develop simple, inexpensive testing equipment and techniques; 3) evaluate the accuracy of the above by testing rock and other materials and comparing the measured fracture toughness with those obtained by other methods; 4) measure fracture toughness of a substantial number of different rocks from three ongoing tbm projects; 5) compare fracture toughness results with other strength measures; 6) compare all test results with observed tbm performance in the three projects. For the covering abstract of the symposium see TRIS 452576. (TRRL)

• Supplemental Notes:
  • Proceedings of the 23rd Symposium on Rock Mechanics, Issues in Rock Mechanics, University of California, Berkeley, California, August 25-27, 1982.
• Corporate Authors:

  American Institute of Mining, Mettalurgy & Petroleum Engineers

  345 East 47th Street
  New York, NY  United States  10017
• Authors:
  • Ingraffea, A R
  • Gunsallus, K L
  • BEECH, J F
  • NELSON, P
• Conference:
  • Proceedings of the 23rd Symposium on Rock Mechanics, Issues in Rock Mechanics, University of California, Berkeley, California, August 25-27, 1982.
• Publication Date: 1982

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 463-470

Subject/Index Terms

• TRT Terms: Accuracy; Conferences; Economic efficiency; Equipment; Errors; Failure; Forecasting; Fracture mechanics; Measurement; Performance; Rocks; Samples; Shape; Strength of materials; Test procedures; Testing; Testing equipment; Toughness; Tunnel borers; Tunneling machines
• Uncontrolled Terms: Efficiency; Fracture
• ITRD Terms: 8525: Conference; 5911: Efficiency; 3674: Equipment; 6440: Error; 5520: Failure; 132: Forecast; 3383: Full face tunnelling machine; 6136: Measurement; 4154: Rock; 6251: Sample (mater); 9073: Shape; 5544: Strength (mater); 6288: Test method
• Subject Areas: Economics; Geotechnology; Highways;

Filing Info

• Accession Number: 00452591
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jul 31 1986 12:00AM