Estimation And Simulation Of Water Inflow In Open Pit Combined Mining Coal Mine

China is rich in coal resources,which plays an irreplaceable role i n the national economy.However,coal mine safety accidents,especially coal mine water disaster,have been one of the important factors threat ening coal mine production,seriously restricting the development and ut ilization of coal mine.Accurate prediction of mine water inflow is of g reat significance to the prevention of mine water disaster,reduction of economic loss and safety in production.In this paper,Pingshuo mining area in Shanxi Province is selected as the research object.Based on the actual production and operation data and field monitoring and explorati on data of the coal mine,mathematical statistics,refraction seismic inv ersion,remote sensing supervision and classification and other methods are used to estimate,simulate and predict the water inflow of open pit coal mining combined with numerical method and groundwater simulatio n analytical method.The main research contents and results are as follo ws:(1)Using seismic exploration equipment to collect seismic wave da ta in the study area,and using plotrefa(refraction analysis)and pickwi n software combined with 19 geological borehole data,it is determined that there are Quaternary,tertiary,Permian,Carboniferous and Ordovicia n strata structure in the study area,and the aquifer,aquiclude and coal bearing strata structure in the coal mine area are identified.(2)Based on the satellite image data from 1985 to 2018,Using en vi remote sensing to supervise and classify the land use analysis of the mining area,the mining area of the open-pit coal mine has been on th e rise since the establishment of the mine,with an increase of 9.06%t aking into account the evolution of the surface environment and climate change of the mining area,conducting multiple statistical regression an alysis,establishing a mathematical statistical model based on the mining progress and the water inflow of the mine,and realizing the simulatio n calculation of the water inflow of the open-pit coal mine.The model was established in 2013-In 2014,the simulation effect is poor,and af ter 2015,the simulation effect is good.(3)Based on the pumping test and recovery water level test data,t he Neuman model is used to calculate the aquifer system parameters of coal measure overburden.The ?,?*,K obtained from pumping test a re 0.118,0.002 and 3.477,and the ?,?*,K obtained from resuming p umping test are 0.045,0.003 and 2.754,which realizes the estimation o f water cut system parameters of coal measure strata and overlying stra ta.(4)Using analytic method to predict the mine water inflow of Antaib ao and Anjialing Open-pit Mine and Anjialing mine,it is concluded that the normal water inflow of mine 1 is 106.88 m 3/h,the maximum water inflow is 305.72 m3/h;the normal water inflow of Antaibao open-pit mine is 57.07 m3/h,the actual water inflow is 82.5 m3/h;the normal water inflow of Anjialing Open-pit Mine is 3.53 m3/h,the actual water inflow is 4.77 m3/h.GMS is used to predict the water inflow.The result shows that the water inflow of No.4 coal mine is 211.1 m3/h,and that of No.9 coal mine is 317.2m3/h.