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Backfilling materials and methods for stress transfer modification in deep longwall mines.

Authors
Jude-CV; Vandergrift-TL
Source
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9433, 1995 Jan; :1-32
Link
NIOSHTIC No.
10012557
Abstract
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.
Keywords
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
Publication Date
19950101
Document Type
Information Circular
Fiscal Year
1995
NTIS Accession No.
PB96-115662
NTIS Price
A04
Identifying No.
IC-9433
NIOSH Division
DRC
Source Name
Denver, CO: U.S. Department of the Interior, Bureau of Mines, IC 9433
State
CO
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