Interaction between wall rock closure, cemented backfill load, and reinforcement bolt load in an underhand stope at the Lucky Friday Mine.
Williams-T; Denton-D; Seymour-JB; Tesarik-D; Peppein-C; Bayer-D
Minefill 2001: Proceedings of the 7th International Symposium on Mining with Backfill. Stone D, ed., Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2001 Oct; :117-125
Hecla Mining Company and NIOSH cooperated in a study to document the safety of rock support supplied by reinforced cemented paste backfill at the Lucky Friday Mine. Data are presented on backfill modulus values from laboratory tests and compared with modulus values from in-mine wall closure on the backfill. It is theorized that a compressive zone is created in the backfill between the upper and lower bearing plates on the reinforcing bolts, and that the backfill remains stable as long as the compressive zones from adjacent bolts overlap.
Mining-industry; Underground-mining; Rock-mechanics
Minefill 2001: Proceedings of the 7th International Symposium on Mining with Backfill