Petlyovany M. Substantiation of rational parameters of solidifying backfill during ore deposits mining under complex mining-geological conditions

Current task on solidifying backfill rational parameters substantiation is solved in the dissertation during iron ores mining under complex mining-geological conditions. It is established that backfill strength has polynomial dependence on specific surface of blast-furnace slag and limestone and degree dependence on these binding matters consumption. As a result, it is established that boundary value of binding matters specific surface within backfill mixture is 5500 cm2/g. Strength limit of the backfilled massif finishes above the present value. New structural formations in backfilled massif were gained when specific surface of slag particles and limestone changes. Dependence of structural new formation basicity change in backfilled massif on specific surface value of slang and limestone were gained for the first time that allows to change backfilled massif structure, to increase its strength and resistance to tension. The author proposes to change forms of structural new formations of backfilled massif in a room. This will allow to increase its resistance to exposure and seismic loads during massive explosion of an ore. Recommendations for parameters of backfilled massif formation technology based on fine-dispersed binding particles of slag and limestone are developed during iron ore deposits mining on 840-940 m level at CJSC "ZZhRK" that will allow to shorten expenditures of blast-furnace slag in 1.7-2.0 times, increase strength of backfill by 25%. Expected economic effect from its implementation will make up 3,45 UAH per 1 m3 the backfilled mixture.