AN EXPERIMENTAL METHOD FOR MEASURING THE SHEAR FRACTURE TOUGHNESS OF ROCK UNDER ATMOSPHERIC AND HIGH CONFINING PRESSURE. FRACTURE OF CONCRETE AND ROCK: RECENT DEVELOPMENTS. PAPERS PRESENTED AT THE INTERNATIONAL CONFERENCE, UNIVERSITY OF WALES, COLLEGE OF CARDIFF, SCHOOL OF ENGINEERING, SEPTEMBER 20-22, 1989

An experimental method for measuring the shear and tensile fracture toughness of rock materials in uniaxial or triaxial compression as well as uniaxial tension has been developed. The specimen is plate shape with an inclined penetrating notch which has a chevron ligament. Crack extends from the apex of the chevron ligament so that a sharp natural pre-crack is automatically formed. The shear fracture toughness (mode II) of Fengshan marble and Jinan gabbro has been determined in compression with confining pressure from atmospheric pressure to 0.8 GPa, using this method. It is indicated from the experimental results that the shear fracture toughness has a linear dependance with the increasing confining pressure. When the confining pressure is high enough (e.g. 400 MPa) the shear fracture energy is about the order of magnitude of 10-6 J/m2, which is roughly in accordance with the results from the field data of seismology.(A) For the covering abstract of the conference see IRRD 829348.

• Availability:
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• Corporate Authors:

  Elsevier Science Publishers

  Crown House, Linton Road
  Barking, Essex IG11 8JU,   England 
• Authors:
  • Yin, Xinfeng
  • Li, Haiying
  • Xu, Z
• Publication Date: 1989

Language

• English

Media Info

• Pagination: p. 288-296
• Serial:
  • Publication of: Society of Automotive Engineers
  • Publisher: Society of Automotive Engineers (SAE)

Subject/Index Terms

• TRT Terms: Compression; Conferences; Cracking; Failure; Rocks; Shear strength; Strength of materials; Tension
• Subject Areas: Data and Information Technology; Geotechnology;

Filing Info

• Accession Number: 00605966
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 1-85166-414-9
• Files: ITRD, TRIS
• Created Date: Mar 31 1991 12:00AM