Use of Strain-Gauged Rock Bolts to Measure Rock Mass Strain During Drift Development

Johnson, J. C.; Brady, T.; Larson, M.; Langston, R.; Kirsten, H.

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Use of Strain-Gauged Rock Bolts to Measure Rock Mass Strain During Drift Development

Published Date:

1999

Source:

Rock Mechanics for Industry - Proceedings of the 37th U.S. Rock Mechanics Symposium, Vail, Colorado, June 6-9, 1999. Rotterdam, Netherlands: A. A. Balkema Publishers, 1999 Jun; :497-502

Language:

English

[PDF-237.38 KB]

Details:

Personal Author:

Johnson, J. C. ; Brady, T. ; Larson, M. ; Langston, R. ; Kirsten, H. ;

Corporate Authors:

Spokane Research Laboratory (National Institute for Occupational Safety and Health)

Conference Authors:

U.S. Rock Mechanics Symposium (37th : 1999 June 6-9 : Vail, Colorado)

Description:

An experiment is described in which instrumented rock bolts were used to measure strain in the rock mass during drift development at the Stillwater Mine, Nye, Montana, USA. Two strain-gauged rock bolts were grouted into the middle of the rib next to the face. The drift was excavated in three advances, each one-half drift wide. Strains were recorded hourly by a data logger. Results show that the average change in axial bolt strain for the first and second advance was about the same and that there was almost no change in strain after the third advance. Bending strain was observed 19 cm from the head of the bolt.

Subject:

[+]

Document Type:

Book Chapter

Collection(s):

National Institute for Occupational Safety and Health

Main Document Checksum:

[+]

Supporting Files:

No Additional Files

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