DETERMINATION OF THE STATE OF STRESS IN ROCK BY THE MEASUREMENT OF STRAINS ON THE HEMISPHERICAL BOREHOLE BOTTOM. LARGE ROCK CAVERNS - PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM, HELSINKI, FINLAND, 25-28 AUGUST 1986. VOLUME 2

A new technique is presented to measure the complete state of rock stress in a single borehole. The stress tensor is computed from 16 strains on the hemispherical bottom surface of a borehole. An arrangement of strain gauges to determine the stress tensor with high accuracy is described. Details concerning observation equations to be used in practice, a spherical strain cell to bond the strain gauges directly to the rock surface at the appointed stations, the in situ strain measurement system by the stress relief technique and its successful application are presented and discussed. For the covering abstract of the symposium see IRRD 810647. (Author/TRRL)

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  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Sugawara, K
    • Kaneko, K
    • OBARA, Y
    • Okamura, H
  • Publication Date: 1987

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Filing Info

  • Accession Number: 00476297
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-08-034078-4
  • Files: ITRD, TRIS
  • Created Date: Sep 30 1988 12:00AM