Study On Dynamic Prediction Of Mine Water Inflow Under Dynamic Mining Conditions In Longtangyan Iron Ore Mine

Mine water inflow is extremely harmful geological problems in the process of mining.Because of the complexity of hydrogeological conditions in mining areas and the continuity of mining process,it is difficult to accurately predict the inflow of mine water,and the prediction of the inflow of mine water under the mining conditions in complex mining areas is the focus and difficulty in the field of hydrogeology.Taking Longtanyan Iron Mine in Wuhu as the research object,this paper analyzes the regional hydrogeological conditions according to the engineering basic data of the study area.On this basis,the analysis method is used to predict the mine water inflow at-320 m and-480 m levels.According to the actual mining time process of the mining area,two mining schemes under mining conditions are formulated.Scheme 1:Separate mining-320 m level from 2019 to 2021,simultaneous mining-320 m and-480 m level from 2022 to 2024,separate mining-480 m level from 2025 to 2031.Scheme 2: separate mining-320 m layer from 2019 to 2024,separate mining-480 m layer from 2025 to 2031,and dynamic prediction of mine water inflow by numerical simulation method.Finally,the following research results are obtained:1?The preliminary analysis of the regional geological conditions,hydrogeological conditions of the mine area and dynamic monitoring of the groundwater level has identified the tectonic development pattern,characteristics of the water-bearing(isolated)layer group,groundwater recharge,runoff and discharge conditions,and karst development characteristics,and determined the water-filling conditions of the mine area.2?Using the results of the analysis based on the analytical method of calculation requirements,the calculation formula("big well method")to select and determine the value of parameters,the calculation of the two mining levels of the mine water inflow.Using the results of the analysis to generalize the hydrogeological concept model with the actual conditions of the study area,and the use of Visual MODFLOW software to establish a numerical simulation model of groundwater flow,according to the hydrological hole,pressure hole observation data to identify and verify the model,the use of the identified model for dynamic prediction of the pit surge of the two options under mining conditions.3?Combined with the mine area in recent years the actual amount of water inflow and numerical simulation method calculation results analysis,mining conditions under the two mining program calculation results of comparative analysis,analytical method calculation results and numerical simulation method calculation results of comparative analysis,and concluded that the study area mine water inflow and mining activities are inextricably linked;In mining conditions after the simulation of the final moment flow field as the initial flow field of the later model calculations can to a certain extent reduce the calculation error,improve the accuracy of the prediction of the mine water inflow.