Study On The Relation Of Groundwater Recharge And Discharge Between Sijiaying And Macheng Iron Mine

With the stopping of mining in the south of Sijiaying district and the further construction of Macheng mining area,the groundwater dynamics between the two mining areas become more complicated.Therefore,it is of great significance to determine the relationship between groundwater recharge and drainage in the two mining areas.Based on the comprehensive analysis of the pumping test in Macheng mining area,the type of bedrock aquifer and the conductivity of fault in the mining area are determined.On this basis,the dynamic monitoring data of groundwater in the mining area were analyzed and the contour map of each aquifer was drawn.Feflow soft iron is used to simulate and analyze the underground flow field in the study area,verify the geological conditions of Macheng iron mine,calculate the water inflow in Macheng mining area,and predict the relationship between Macheng and Sijiaying iron mine.The results show the bedrock aquifer types in Macheng mining area are obviously zonal.The F1-F2 composite zone is a confined aquifer with overflows.The southern F2 segment is an aquifer with dual porosity medium.Above F1 and F3 are confined aquifers with watertight boundaries,while other areas are confined aquifers without overflows.The upper water level of the quaternary system changes little under the influence of the main partition layer.The water in the lower part of the quaternary system replenishes the bedrock through the seepage and overflow of the skylight.The water level decreases year by year.The bedrock groundwater decreases year by year in the process of tunneling and drainage,forming a descending funnel centered on F1,F2 and F3 composite action zone.The water channel between the two mining areas is located in the area of ZK15-4,NK26.The underground watershed is located in the area of SK15,SK11,SK12.It is predicted the normal water inflow of Macheng mining area will be 679.3m~3/h on August 31,2019.Based on the calculation of lateral supply of bedrock,it is determined this position is an important water control area in late stopping of Macheng mining area.Figure 72;Table 11;Reference 60...