Case studies of cable bolts using instrumented king wires.
Martin LA; Pakalnis R; Curtin RP
Rock mechanics in the national interest: proceedings of the 38th U.S. Rock Mechanics Symposium, DC Rocks 2001, July 7-10, 2001, Washington, D. C. Elsworth D, Tinucci JP, Heasley KA, eds. Vol. II, Lisse, Netherlands: A. A. Balkema, 2001 Jul; 2:1013-1020
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 discplacement of the rock mass, more effective ground support can be selected and installed, which will lead to safer working conditions for miners.
Case studies; Cables; Ground control; Ground stability; Monitoring systems; Monitors; Rock mechanics; Mining industry; Mine workers; Safety equipment; Safety measures; Safety practices
Elsworth D; Tinucci JP; Heasley KA
Rock mechanics in the national interest: proceedings of the 38th U.S. Rock Mechanics Symposium, DC Rocks 2001, July 7-10, 2001, Washington, D. C.