Study On Water Prevention And Control Of Main Inclined Shaft In Hetaoyu Coal Mine

Mine inundation is one of the main disasters in coal mine construction and production.This paper studies the water control during the construction of Hetaoyu main inclined shaft.Based on the analysis of the geological and hydrogeological conditions in the mine,the actual measurement of water inflow in the construction stage of the main inclined shaft is carried out,and the pressure relief measures and drainage measures are optimized.In view of the characteristics of large depth of main inclined shaft and large water inflow through thick sandstone in Hetaoyu Coal Mine,the technical problems of equipment selection,pipeline layout,water silo design and system cycle propulsion in drainage system during shaft construction are optimized.According to the measured water inflow and lithologic parameters,the flow of slurry in horizontal single fractured rock mass is simulated,and the slurry diffusion pattern is drawn by using crack network simulation.Numerical simulation and physical simulation are used to adjust the technical parameters of grouting process,and the pre-grouting and post-wall grouting schemes are optimized.By using ultra-deep hole blasting grouting to block water,the blasting of explosive can enlarge the crack area,increase the spreading radius of the slurry,connect the cracks to each other,and improve the agrouting effect.Research and analysis show that the grouting diffusion radius can only reach about 2m under the existing conditions.The conventional grouting process can not guarantee the diffusion of the slurry into the expected fracture.Using deep hole grouting to form a super thick wall rock reinforcement zone can improve the stability of the surrounding rock and seal the water gushing of the fissures.The engineering practice proves that the study solves the practical problems such as difficult construction of main inclined shaft,waste of grouting and high cost of shaft construction in main inclined shaft of Hetaoyu Coal Mine,and provides experience for mine construction and safe production of the same type of coal mine in this area.