The Mine Water Inflow Prediction Research Based On Three-dimensional Groundwater Model In GMS

Mine inflow one of the more dangerous geological problems in the process of coal mining,it is always threatening the mine safe production.So it is necessary to forecast the amount of water inflow in the mining process,in order to do the advance prevention and control measures for the mine inflow.This paper takes Shanxi Tongfuxin coal mine as the researching background,based on the analysis of geological and hydrogeological conditions in the researching area,using GMS software to build the regional three-dimensional groundwater numerical model,then forecast the water inflow of the 2# coal seam and put forward the corresponding countermeasures according to the forecast results.The main research results of this paper are as follows:(1)Analyzing the hydrogeological conditions of the researching area,including the characteristics of aquifer and waterproofing,underground water trail conditions and mine water filling factors.Low Shihezhi sandstone fractured confined aquifer is the direct water aquifer of coal seam 2,it has a great influence to the mine water filling.(2)Evaluating the water richness of the roof aquifer of coal seam2 based on multi-source information fusion method and AHP,determined the main control factor and its weight,then established hierarchical model and judgment matrix,finally,obtained the water richness index,and partitioning according to the water richness index.The result shows that the roof aquifer is rich of water and it is likely to cause water inrush in the mining process,so it is necessary to predict the water inflow.(3)Using GMS software to build the regional three-dimensional groundwater numerical model,determined the boundary conditions,source sink items and hydrogeological parameters,then check the model.Forecasting the mine gushing water situation from 2016 to 2020,analyzing the change regularity of the mine inflow and groundwater level and obtained result of the mine inflow.(4)Using the groundwater dynamics method to calculated the amount of mine inflow,compared the results with simulation results,verified the reliability of the simulation results.(5)Proposed some countermeasure to prevent the water inflow according to the simulation results.