Risk reduction in underground mining of coal-bearing coal seams with hydraulic fracturing

Abstract

The paper discusses influence exerted by the parameters of hydraulic fracturing on flow coefficient in parallel holes in pre-mining degasification of coal seam non-unloaded from rock pressure. The rates of coal degasification without hydraulic fracturing, as well as with nondirectional and multistage hydraulic fracturing are compared. Effect of different-type fracks on risk reduction in underground coal mining is assessed. The obtained results allow estimating efficiency of the hydraulic fracturing modifications currently in use in coal mines.