Study On The Prediction Of Mine Inflow By Feflow In Fan-gezhuang Coal Mine

The prediction of groundwater inflow is of great significance to the design of coal mine water and drainage system and the prevention of water inrush accident,which is the guarantee of coal mine safety production.The safety mining of coal mine is based on the production index as the evaluation standard,which directly affects the overall layout of coal mining,and the gushing quantity is becoming more and more important as the important component parameter.There are a variety of methods for predicting the current water inflow.In recent years,numerical simulation has been widely recognized by the workers.With the rapid development of computer level,all kinds of software emerge in an endless stream,Germany's Feflow software at home and abroad by virtue of its excellent data processing,convenient parameter adjustment and rich image display ability has been the majority of hydrological workers of all ages.In this paper,based on Felow software simulation to predict mine gushing water,through a comprehensive software introduction,in-depth application of coal mine groundwater prediction,made the following research results.Including:(1)Summarizing the numerical simulation and the research status of mine water inflow at home and abroad;comparing the advantages and disadvantages of existing groundwater simulation software;analyzing the function,characteristics and characteristics of Feflow software input and output,and the applicability in the mine gushing forecast?(2)The simulation results of Feflow software are compared with the known results by comparing the 1400m*1400m*10m cube and the45 ° fan-shaped ideal aquifer pumping model with a known analytic solution.The accuracy of Feflow software simulation is verified.(3)Studing the actual hydrogeological conditions in the mining area and to analyze the parameters required by the numerical simulation calculation using Feflow software,and combine the software with Autocad,Arcgis,Sufer and office for a lot of data processing and generalization.(4)Using Feflow software to simulate the single layer of X-mine and its fourth-layer aquifer,the simulation results were run,identified and tuned,and the water level data of the hydrological observation hole were fitted.Dimensional or three-dimensional map,the trend table shows the groundwater level and other parameters.(5)The numerical simulation results are fitted with the actual observation hole data to explore the reason of the simulation error.By fitting the whole groundwater flow field,the calculation formula of the gushing water is calculated and analyzed.Through the simulation of the fourth layer of aquifers,the observation hole water level error is only 2.8% and 5.2%,the effect is good.It is predicted that the subsurface flow field in 2017 is in line with the actual situation.The trend of water level decline is the same as that of 2016.The trend of groundwater flow field in coal aquifer is predicted by 5 years(2020)12-14,and the prediction formula 2020 12 coal-14 coal aquifer(fourth aquifer)gushing water is 14.14 m3/ min.(6)Analysis error comes from the accuracy and comprehensiveness of the data,the grid division of the uncertainty arising from the assignment.The paper analyzes the characteristics of the software and the simulation data,and concludes that Feflow has the characteristics of simple adjustment,good post-processing ability and good display effect in the prediction of mine water inflow,and has the display advantage which other software does not possess.The software has good effect on simulating groundwater flow field and motion trend,but the calculation of high precision data such as gushing water has a common problem that various numerical simulation software is difficult to solve in the direction of hydrogeology,that is,it needs a lot of high precision original data collection.