Advertisement

pure and applied geophysics

, Volume 123, Issue 1, pp 59–80 | Cite as

Design parameters for borehole strain instrumentation

  • Michael T. Gladwin
  • Rhodes Hart
Article

Abstract

The response of a borehole strain meter to hydrostatic and shear deformations in an isotropic medium is calculated to facilitate optimum instrument design and produce instrument response factors for parameters typically encountered in installed instruments. Results for an empty borehole are first compared with results for an instrument in intimate contact with the surrounding rock. The effects of the grout used to install the instrument are then examined. Where possible, analytic forms for the response factors are given. Results for typical installations are then presented in graphical form for optimizing instrument design in an environment of known elastic parameters. Alternatively, the results may be applied in the measurement of unknown strain signals, to correct for instrument response or to provide in-situ estimates of the elastic properties of the environment by examination of observed strain response to known strain signals.

Key words

Borehole strain strain monitoring shear stran earthquake strain 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Amadei, B. (1983),Rock anisotropy and the theory of stress measurements, Springer-Verlag.Google Scholar
  2. Gladwin, M. T. (1984),High precision multi-component borehole deformation monitoring, Rev. Sci. Instr. 55, No. 12, 2011–2016.Google Scholar
  3. Jaeger, J. C. andCook, N. G. W. (1976),Fundamentals of rock mechanics, 2nd ed. Chapman and Hall.Google Scholar
  4. Muskhelishvili, N. I. (1953),Some basic problems of the mathematical theory of elasticity, Noordhoff Ltd., Groningen, Holland. Trans. J. R. M. Radok.Google Scholar
  5. Sacks, I. S., Suyehiro, S., Evertson D. W. andYamagishi, Y. (1971),Sacks-Evertson strainmeter, its installation in Japan and some preliminary results concerning strain steps, Papers Meterol. Geophys.22, Nos. 3–4, 195–208.Google Scholar
  6. Sakata, S., Shimada, S. andNoguchi, S. (1982),Development of new-type three-component borehole strainmeters, Proc. 3rd Joint Panel Mtg. U.J.N.R. Panel Earthquake Prediction Technology, pp. 234–248.Google Scholar
  7. Savin, G. N. (1961),Stress concentration around holes, Pergamon Press. Transl. W. Johnson.Google Scholar

Copyright information

© Birkhäuser Verlag 1985

Authors and Affiliations

  • Michael T. Gladwin
    • 1
  • Rhodes Hart
    • 1
  1. 1.Department of PhysicsUniversity of QueenslandSt. LuciaAustralia

Personalised recommendations