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Mining Publication: Case Studies of Cable Bolts Using Instrumented King Wires

NOTE: This page is archived for historical purposes and is no longer being maintained or updated.

Original creation date: July 2001

Image of publication Case Studies of Cable Bolts Using Instrumented King Wires

Instrumented cable bolts developed at the Spokane Research Laboratory of the National Institute for Occupational Safety and Health were used in conjunction with existing ground control to monitor rock mass loads at various field sites (FMC Granger, Getchell, Meikle, SSX, K-2, and Stillwater). Axial and shear loads were determined by strain gauges to levels of instrument accuracy of +/- N or +/- 5 microstrain as these loads were transferred to instrumented cable bolts. The gauges were 12.5 mm long and embedded into a remanufactured king wire that replaced the conventional king wire. Cable bolt performance, quality of grout, and installation techniques were also assessed. By using instrumented cables, a mine operator can determine axial load along the cable at predefined gauge locations. By monitoring load on and displacement of the rock mass, more effective ground support can be selected and installed, which will lead to safer working conditions for miners.

Authors: LA Martin, R Pakalnis, RP Curtin

Conference Paper - July 2001

NIOSHTIC2 Number: 20021385

In: D. Elsworth, J.P. Tinnucci, and K.A. Heasley, eds. Rock Mechanics in the Public Interest. Proceedings of the 38th U.S. Rock Mechanics Symposium, DC Rocks, Vol 1, (July 7-10, 2001; Washington, DC), Balkema, 2001 Jul; :1013-1020