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Mining Publication: Field Tests of Cable Bolts Using Instrumented King Wires

NOTE: This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.

Original creation date: March 2000

Image of publication Field Tests 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 (T.G. Soda Ash, Getchell, Meikle, SSX, K-2, and Stillwater). Axial and shear loads were determined by strain gages to levels of instrument accuracy of ±5 N or ±5 microstrain as these loads were transferred to the instrumented cable bolts. These gages 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 gage 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 - March 2000

NIOSHTIC2 Number: 20021238

Presentation at the Canadian Institute of Mining, Metallurgy, and Petroleum--CIM 2000 Meeting, 2000, Mar 5-10 Toronto, Ontario, Canada :1-10