Stress determination from strain relief measurement on the ends of boreholes: M38-8/110E-PDF

planning, data evaluation and error assessment /

"The method of strain-relief measurement on the flattened ends of boreholes is a relatively economical means for determining stress deep in rock. Experience with the method has enabled the mechanical and statistical problems of instrument design, planning the measurement system, evaluating the results and assessing the errors to be better appreciated. Use of a four-element 45-degree strain-gauge rosette is recommended. Borehole configurations for optimum precision with this and other rosette designs are given. Since it may be impractical to use an optimum configuration at a given site, a series of layouts suitable for a variety of sites is presented. An order of preference is given. Experimental methods of checking the validity of strain measurements and a statistical method for final screening of data are given. Currently, the greatest errors in the method are caused by uncertainty about the values of the calibration factors or stress concentration factors associated with flat ended boreholes. A review of recent work on this problem has yielded recommended calibration factors, with their degree of uncertainty. The sensitivity of the calculated stress components to the values of the calibration factors is illustrated by an example"--Summary, p. 1.

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Department/Agency Natural Resources Canada. Dept. of Energy, Mines and Resources. Mines Branch.
Title Stress determination from strain relief measurement on the ends of boreholes
Subtitle planning, data evaluation and error assessment /
Series Title Reprint series ;
Publication Type Series - View Master Record
Language [English]
Format Electronic
Electronic Document

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Note Cover title. "Reprinted from Proceedings of the International Symposium on the Determination of Stresses in Rock Masses, Lisbon, 19-21 May 1969, pp. 183-199 [...]." Historical publication digitized from print 2017 [by Natural Resources Canada].
Date 1972.
Number of Pages 10, [8] p. :
Catalogue Number
  • M38-8/110E-PDF
Departmental Catalogue Number 300189
Subject Terms Mining industry, Rocks, Physics