EVALUATION OF HYDROGEOMECHANICAL STABILITY OF INTER-SHAFT PILLARS

The mechanism of possible destruction of inner-shaft pillars under the influence of hydraulic impact from flooded mine is considered. The scenario of reduction of hydrogeomechanichal stability of inner-shaft pillar at unilateral flooding of adjacent mine the following: ? shift of pillar under the influence of a hydraulic pressure; ? sharp increase in filtrational permeability pillar owing to hydraulic fracturing. The made analysis allows to draw a conclusion that criteria correlations to stability evaluation of the inner-shaft coal pillars follow from a correlation: capacities of coal pillar; water pressure over pillar and laying depths of pillar of a surface; density of mine water and average density of rocks between pillar and surface; stress concentration factor.