| Huaibei coalfield is an important coal base in China.The development of its coal industry is restricted by mine water inrush.The most important task is to quickly and accurately identify the inrushwater source which can effectively prevent and reduce the probability of water disaster accidents.The study was to take the main aquifer system of Qianyingzi coal mine in Huaibei coalfield as a object,based on the understanding of the geological and hydrogeological conditions of the mine field,this study tested and analyzed the major ions of the aquifer water samples in the mining area,used conventional water chemistry methods,sach as Piper diagram,Gibbs diagram and ion proportion coefficient method,and combination with mathematical statistical methods,sach as correlation analysis,R-model cluster analysis,and EPA Unmix model analysis,to explore the hydrochemical characteristics,control factors and evolution mechanism in groundwater of different aquifers in the mining area.The water source identification model of each water aquifers was established.Concluded as follow:(1)The hydrochemical types of groundwater from different aquifer are different obviously.In the loose layer aquifer,the contents of Na+,Cl-and HCO3-in firstly aquifer are obviously low,and the water hydrochemical types are mainly HCO3-Ca Mg and HCO3-Ca Na,the hydrochemical types of second aquifer are HCO3-Na Mg and HCO3 SO4-Na Mg,and third aquifer are mainly HCO3 SO4-Na,the cation in fourth aquifer are mainly Na+,the anions are mainly HCO3-and Cl-,and hydrochemical type is mainly HCO3 Cl-Na.The coal-bearing aquifer have more enrich in Na+,HCO3-,and its hydrochemical types are mainly SO4 HCO3-Na.Na+and SO42-in the groundwater of the Taiyuan limestone aquifer are dominant,and its hydrochemical types is mainly SO4-Na Ca.(2)Through the method of ion ratio and mathematical statistics of groundwater in the mining area show that the types of water-rock interaction in the aquifer of Qianyingzi coal mine was complex,which was mainly controlled by the weathering of silicate minerals and the dissolution of sulfate,carbonate and halite.Among them,the loose layer aquifer was affected by the various types of water-rock interaction,and hydrochemical composition were mainly controlled by the dissolution of carbonate,sulfate and halite and the weathering of silicate minerals.The difference was the source of Na+in firstly,second and third aquifer was more inclined to chlorine salts,while the fourth containing water was more inclined to silicate minerals.The sources of Ca2+and Mg2+ in fourth containing water were not only related to carbonate,but also comes from the dissolution of sulfate.The chemical composition of coal-bearing water was mainly controlled by the weathering of silicate minerals and the dissolution of sulfate.The weathering of carbonate,sulfate and silicate minerals was the main source of ions in Taiyuan limestone aquifer.(3)The groundwater samples of the main water inrush aquifer are screened step by step,and the water source identification model of the main water inrush aquifers in Qianyingzi coal mine is constructed by discriminant analysis.The results of the model retest show that the identification accuracy of the fourth aquifer samples is 100%,and the overall water source identification accuracy is 94%,indicating that the model has good effect.The mine water source identification model based on pure water samples showed that the hydrochemical information contained in the fourth aquifer and coalbearing water was relatively similar,and there may be a certain hydraulic connection.Therefore,In the future mine production activities,we should focus on preventing the threat from the fourth aquifers.Figure[23]Table[12]Reference[94]... |
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