Dynamic Development Height of Water-conducting Fracture Zone in No.4301 Working Face of Longquan Coal Mine
The sandstone fracture water in the roof is prone to sudden water inrush into the No.4301 large-mining-height fully mechanized caving face of Longquan Mine.To address this problem,theoretical analysis and numerical simulation were used to explore the dynamic evolu-tion of the development height of water-conducting fracture zones during the mining of the work-ing face.The numerical simulation shows that when the advancing distance of the No.4301 work-ing face is less than 96 meters,the development height of the water-conducting fracture zone in-creases with the advance of the working face and the maximum development height is about 75 meters;when it is greater than 96 meters,the development height of the water-conducting frac-ture zone changes slightly and stabilizes at 75 meters.The results are consistent with the theoreti-cal analysis of the development range of the water-conducting fracture zone from 57 to 75 m,indi-cating that the numerical simulation results are reasonable.The K4 and K5 water-bearing sand-stone layers above the overlying rock of the working face are within the development range of wa-ter-conducting fracture zones.During the water-preserving mining,we should focus on preven-ting the K4 and K5 water-bearing sandstone layers from being damaged.The research results re-veal the dynamic development characteristics and final development height of the water-conduc-ting fracture zone in the mining of the No.4 coal seam in Longquan Mine,which is of great signif-icance for the determination of the disturbance range of the overlying rock aquifer.It could pro-vide a reference for the safe and green mining of coal resources under similar conditions.
NETL
NSTL
万方数据
