Research On "Three Belts" Distribution Of15th Coal Seam Hard Roof In Gushuyuan Mine

Mining strata is divided into three mining with influence, namely the caving zone,water-flowing fractured zone and curve subsidence zone. Researching development height of“three zones” plays an important role on the safety production of coal mine.To research the crack development regularity and “three zones” distribution of15#coalseam hard roof,this paper applied theory calculation, numerical simulation and drilling peepmethods field detecting. Through research of15#coal seam “three zones” distribution, weprepare contour map of caving zone and fracture zones,and concluded15#coal seam fracturezone maximum growth altitude, and predicted the possibility of water infiltration in9#coal goafwhen15#coal seam is mining.According to crack development hole gas concentrationdistribution and the situation on roof lithology, we divided “hree zones” height and provided thebasis feasibility and rationality of15#coal gas drainage system establishment.Through theoretical calculation, site measurement and numerical simulation, we divided thescope of“three zones”.we analysis the possibility of water infiltration in9#coal goafrespectively from the hydrological, geological conditions, the relationship betweenmining-induced fractures and aquifer, the relationship between fault and aquifer.Based onGushuyuan mine15#coal seam gas migration rule fracture zones, formed a “high roof drillingdrainage, goaf buried tube extraction and layer drilling drainage” as the core of thethree-dimensional comprehensive drainage technology.