Backfilling materials and methods for stress transfer modification in deep longwall mines.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9433, 1995 Jan; :1-32
This U.S. Bureau of Mines report presents a review and evaluation of existing and new backfilling materials and methods for their applicability to the problem of gate road stress reduction in deep retreat longwall coal mines. Candidate backfill materials include pulverized coal combustion fly ash, flue gas desulfurization, and fluidized bed combustion by-products from coal-fired electric power generation plants. Properties of both backfill and its component materials are presented, with particular emphasis on the unconfined compressive strength and elastic modulus of backfill mixtures. Hydraulic mix designs discussed in this report include high-water content slurry and low-water content paste fills.
Coal-mines; Fly-ash; Combustion-products; Waste-products; Mixtures; Grouting; Injection; Displacement; Strata-control; Stress-intensity-factors; Compressive-strength; Hydraulic-characteristics; Mechanical-properties; Underground-mining; Mining-engineering; Longwall-mining; Backfilling; Stress-analysis; Waste-utilization; Fill-materials
NTIS Accession No.
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9433