Development of Sectional Water Injection Bore-enveloping in Coal Mine

Based on water injection effect analysis and problems of the single grade inflation type water injection bore-enveloping in the "three-stress-zones" of the driving face,successfully developed the driving face "three-stress-zones "sectional water injection bore-enveloping;The field application shows that,coal seam by the sectional water injection bore-enveloping has water injection dust suppression efficiency after water tunnel boring machine driver and were respectively 66.5% and 67.6%,achieved better effect of dust.