The complete mathematical analysis is given for a method of measuring the in situ state of stress in a rock mass. The technique consists of cementing a tubular probe, cast from epoxy resin and in which strain gauges have been embedded, into a hole predrilled into the rock mass. The probe is then over-cored releasing the strains in the rock (apart from small residual strains) and inducing strains into the epoxy probe. As the probe has different elastic properties to the rock an analysis is required which accounts for the differing elastic properties of the two media and also the position of the strain gauges relative to the surface of the hole in the piece of rock. The details of this technique are compared with those of two related techniques, the first in which the strain gauges are cemented directly to the surface of the rock, the second in which a solid epoxy probe, with embedded strain gauges, is cemented into the hole. In fact the equations derived in the paper reduce to those of the other two techniques as special cases.(a) (TRRL)

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,   England 
  • Authors:
    • Fama, MED
    • Pender, M J
  • Publication Date: 1980-6

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Filing Info

  • Accession Number: 00325412
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Apr 15 1981 12:00AM