Numeric model of a cemented rockfill span test at the Turquoise Ridge Mine, Golconda, Nevada, USA.
Tesarik-DR; Seymour-JB; Martin-LA; Jones-FM
MINEFILL 2007: Proceedings of the 9th International Symposium on Mining with Backfill, April 29 - May 2, 2007, Montreal, Quebec, Canada. Montreal, Quebec, Canada: Canadian Institute of Mining, Metallurgy and Petroleum, 2007 Apr; :2512
Researchers from the National Institute for Occupational Safety and Health (NIOSH) and engineers from Placer Dome, Inc., conducted an underground rockfill span test at the Turquoise Ridge Mine near Golconda, Nevada, USA with the purpose of improving safety and increasing productivity by using a bulk mining method instead of drift and fill. A rockfill sill was constructed by mining and backfilling six adjacent, parallel drifts and then undercutting the sill with a 13.7 m (45 ft) wide and 30.5 m (100 ft) long room. Displacement measurements from vertical borehole extensometers installed in the mine roof and rockfill indicated that the sill remained stable with a maximum vertical deformation of less than 5 mm (0.2 in). These results were confirmed by visual observations and calculations from a validated three-dimensional numeric model of the sill. The numeric model was also used to simulate load on the sill produced by dislodged roof material in the shape of a 11.0 m- (36 ft-) high triangular prism with base measurements equal to those of the sill. Failure in the bottom third of the sill occurred with this additional load.
Mining-industry; Underground-mining; Safety-engineering; Models; Computer-models
MINEFILL 2007: Proceedings of the 9th International Symposium on Mining with Backfill, April 29 - May 2, 2007, Montreal, Quebec, Canada.