Roof stress control of near distance coal seam safety mining with shallow buried room-pillar
The 2-2 coal seam of Hanjiawan coal mine adopts room-pillar mining mode,and the coal pillar forms concentrated stress in the floor,which causes certain safety risks for 3-1 coal seam mining.In order to solve the problem that a large a-mount of energy accumulates in the roof of thick and hard rock strata during the safe mining of close coal seam,which may induce large-area shelving or mine earthquake,hydraulic fracturing technology is proposed to weaken the dense and thick rock strata.After the analysis of characteristics of the overlying rock and roof hazard,and based on the mechanism of dis-turbance on the left strip coal pillar and room-pillar coal pillar of the upper 2-2 coal seam during the mining process of the lower group coal of the three panel area,we adopt long-level-hole locally fracturing technology to carry out the hydraulic fracturing of the two roadways'coal pillars of the 2-2 coal seam,and put forward local fracturing technological parameters and directional long borehole fracturing technique.
near distance coal seamshallow buried room-pillarroof stressmine earthquakehydraulic fracturing
万方数据
维普
