The Prediction Of Mine Inflow And Water Inrush Risk Assessment In An Open-pit To Underground Mining In Yanqianshan Iron Ore Mine

Yanqianshan iron mine is currently in the stage of transition from open-pit tounderground mining, after which mining for deep ore body will be implemented.Affected by the special topography and hydrological geology characteristics, waterdistress problems will be a severe problem in mining of Yanqianshan iron mine, ifeffective measures are not taken. Based on this background, this paper firstly find outthe geological features of ore area hydrology by the method of hydrogeology surveyand exploration, water level observation. Secondly, we analyze and classify the waterquality of the underground water sample in the typical location, surface and shaft andtunnel to research the characteristics of groundwater chemistry in the mining area.Thirdly, we predict of mine water inflow using underground hydrodynamics methodand analogy method of hydrogeology. Finally, a3D geological model of the miningarea is built to evaluate the future risk of mine water disaster in the undergroundmining process, which provides a basis for Waterproof and drainage measures of minewater disaster.(1) To research the geological characteristics of hydrology in the mining areaWe select28representative positions and extract water samples in the rivers andwells, mine, tunnel, pit within or around the recharge areas and excretion area. Thenwe classify the water samples according to the Kalev classification method, evaluatethe groundwater chemical types, and find out the chemical characteristics of thegroundwater; Through the hydro geological survey, we find out the aquifer spatialstructure, groundwater system boundary, runoff and discharge conditions of thegroundwater or the ground water level dynamic variation characteristic in the miningarea. Which can provide basis for the calculation of mine water inflow, forecastingand management of mine water disaster, and the comprehensive utilization of minewater and groundwater.(2) To expect the water inflow during the processing of the mining in the futureAccording to the mining stage, we expect the mine water inflow on the conditionof wall hanging mining and underground mining using "groundwater dynamics method". Then, we analyze the calculation results. Finally, we determine the waterinflow value, which provide the basis and reference for the capacity allocation ofunderground drainage and the design of drainage system.(3) Research on visualization of mine water disasterAfter determining the water filling factors and water filling source of mine waterdisaster, we build "3D geological model of the mining area " using ArcGIS, Surfer,Abaqus, Midas and other software. Combining the3D geological model with theinformation of tunneling catalog, seepage and joint statistics, we evaluate the miningfault transmissibility and the seepage risk assessment in the mining area, whichprovide evidence for the prevention of mine water disaster.