Analysis of hydrogeological characteristics of upper coal seam in Luwa Coal Mine of Jining Coalfield
Luwa Coal Mine has mined the upper coal group for more than 20 years,and the hydrogeological conditions have changed.In order to summarize the water damage factors that may affect the mining of the upper coal group in Luwa Coal Mine,based on the study of the hydrogeological conditions of Jining Coalfield and Luwa Coal Mine,the water filling factors of the upper group coal seam mining were analyzed.According to the years of monitoring data,the permeability coefficient of aquifer in water conducted zone was solved by u-sing the formula of"large well method",and the mine water inflow was predicted by analytical method and analogy method.The results show that the main water filling sources of the upper coal group in Luwa Coal Mine are pore water,goaf water,Jurassic sandy conglomer-ate water,sandstone water,three ash water and Ordovician ash water in the lower section of the Quaternary Lower Formation.The main water filling channels are faults,mining fissures,poorly sealed boreholes,karst collapse columns,etc.The normal water inflow of the up-per group coal seam predicted by the analytical method is 158.5 m3/h,which is in line with the actual situation of the mine.However,it is suggested that the normal water inflow of the upper group coal seam predicted by the analogy method is 219.23 m3/h,and the max-imum water inflow is 328.85 m3/h.Suggestions on mine water disaster prevention and control are put forward.
Jining CoalfieldLuwa Coal Minethe upper group of coalhydrogeologywater damage prevention
万方数据
维普
