Study On Hydro-geochemistry Of Main Inrush Aquifers In Linhuan Coal Mine Area

Linhuan coal mine area, part of Huaibei coalfield, is a typical blind coal minearea in North China. The hydrogeological condition there is extremely complex. Asimmediate inrush water sources, aquifers is contacted with coal seam directly. Asthe depth and scale of mining is increased, groundwater problems is increasinglyacute and is attached importance by researchers in home and abroad. Regard as aforeland discipline, hydro-geochemistry is based on water-rock interaction, mainlydescribed the quality dynamic, spatial and temporal distribution of groundwater.Analysis of hydro-geochemistry is novel, convenient, and reliable.Hydro-geochemical methods were used in this text to analyze the character ofhydro-geochemistry about multi-aquifers system in Linhuan coal mine area,discriminant models of inrush water source were established, in order to provide aresearch guidence for efficiently safety production of coal mine area.Firstly, geological and hydrogeological data were collected in Linhuan coalmine area, literature were researched to know the research actuality ofhydro-geochemical character of coal mine area at home and abroad. Secondly，water samples were collected and tested to obtain conventional hydro-chemical andisotopic data. the relationship between the composition of δ18O-δD and TDS hadbeen analyzed, and distribution character of Tritium had been studied. Combinedwith the background value of Huaibei coalfield for isotope, recharge source ofgroundwater were analyzed, and the mixture model of end-member waters ofhydrogen and oxygen stable isotopes was established in Linhuan coal minearea.The Piper diagrams of water samples before and after1990were compared, toevolve the hydrochemical types. The principal factors of each inrush aquifer wereextracted using factor analysis, to make clear the hydrochemical formative actionduring the process of evolution. At last, fisher discriminate analysis and fuzzyrecognition methods were taken to establish multi-aquifers’ discriminant models ofinrush water source, these two methods were compared with each other, to explainthe misclassification rate.Main conclusions as follow: Meteoric water was the primary source ofgroundwater in mine area, the recharge percentages of end-member waters in maininrush aquifer were different. Hydraulic connection between aquifers was strengthened because of mining disturbance, mixing action was shown in maininrush aquifer. Dissolution, desulfation and mixing action were main actions toaffect the process of hydrochemical evolution. Models discriminant analysis basedon Fisher discriminate analysis and Fuzzy identification were shown highmisclassification rate of inrushed water source except coal measures formationsource. Mixture of main inrushed aquifers under mining disturbance is the primaryreason of misclassification...