Details:

Personal Author:
Johnson, J. C. ; Brady, T. ; Larson, M. ; Langston, R. ; Kirsten, H.
Johnson, J. C. ; Brady, T. ; Larson, M. ; Langston, R. ; Kirsten, H. Less -
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:
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Mining

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
Document Type:
Book Chapter
Genre:
Conference Publications
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:edb98eb7c560a6484359beb0a7b385a8ecfd3b9a038a81e941754b7df4e3bc48
File Type:

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