Specifics of hydro-loosening of coal seams with account of rocks displacement parameters

The analysis of efficiency decline of methods for hydraulic
influence on outburst-prone coal seams in the conditions of large depths is
represented. The models are considered for parameters calculation of high-
pressure liquid injection, based on the hypotheses of the stress-strain state
formation of the coal seam; the patterns of rock pressure manifestation as
well as calculation discrepancy between the liquid injection pressure and
the terms of large depths, are established. It is shown that in the parameters
calculation of the high-pressure liquid injection, it is necessary to take the
height of the column of rocks which lost their integrity and form the
stratification zone in the underworked massif instead of depth Н of the
seam mining. It has been established that the efficiency of hydro-loosening
depends not only on the injection pressure, but also on the location of
borehole filtration part relative to the maximum of abutment zone.