Analysis of accuracy in the determination of the ground-stress tensor by means of borehole devices / W.M. Gray and N.A. Toews, Mining Research Centre.: M38-8/109E-PDF

“The determination of the state of stress existing at a point in any solid body requires the determination of the six components of the stress tensor relative to a convenient set of axes. One general method of doing this in rock is to make strain or deformation measurements associated with local relief of stress in a number of boreholes penetrating a limited volume in the vicinity of the point at which the stress is to be determined. The stress is assumed to be constant throughout this volume. Leeman has described a number of the instruments that have been developed for making deformation or strain measurements in boreholes. Panek has described the application of statistical methods to the determination of the average components of ground stress from sets of measurements made in boreholes by means of deformation meters of the type developed by the U.S. Bureau of Mines. In this paper attention is given initially to the strain cell developed for use on the flattened ends of boreholes by the Council for Scientific and Industrial Research (CSIR), South Africa. The equations required for evaluating the average components of ground stress from measurements made by means of the CSIR strain cell are derived. These equations are similar in form to those applying to measurements made by the borehole deformation meter developed by the U.S. Bureau of Mines. The results of an investigation of the properties of the equations are described. These results are important in the practical use of both the instruments mentioned above and any instrument based on similar principles"--p. 45.

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Publication information
Department/Agency Canada. Natural Resources Canada.
Canada.Dept. of Energy, Mines and Resources.
Canada. Mines Branch.
Title Analysis of accuracy in the determination of the ground-stress tensor by means of borehole devices / W.M. Gray and N.A. Toews, Mining Research Centre.
Series title Reprint series ; RS 109
Publication type Series - View Master Record
Language [English]
Format Electronic
Electronic document

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Note(s) Cover title.
"Reprinted from Proceedings of the Ninth Symposium on Rock Mechanics held at the Colorado School of Mines, Golden, Colorado, 17-19 April, 1967, chapter 3, pp. 45-78."
Historical publication digitized from print 2017 [by Natural Resources Canada].
Includes bibliographical references.
Publishing information Ottawa : Information Canada, 1972.
Author / Contributor Gray, W. M.
Toews, N. A.
Description p. 45-78
Catalogue number
  • M38-8/109E-PDF
Departmental catalogue number 300188
Subject terms Mining industry, Rocks, Physics

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