Chemical characteristics of water-rock symbiotic groundwater in western mining area of Pingdingshan Coal Mine
The bottom of the coal seam in western mining area of Ping Coal has a strongly water-rich gray rock aquifer,and the risk of water inrush from karst water on the bottom plate increases,which po-ses a great hidden danger to the safe production of the mine.In order to identify the water source of coal mine water inrush,it is necessary to study the hydrogeochemical characteristics of mine aquifers.Taking the core samples of the three main aquifers of Ping Coal No.5 Mine as the research object,XRD and XRF were used to test the mineral composition and elemental composition of the core samples,and combined with the leaching test and soaking test,the chemical composition and hydrochemical type of the leachate,extract and the original water samples were comparatively analyzed by using the Piper's trilinear diagram to determine their accuracy.The results indicate that the anions in the three types of original water samples are primarily composed of HCO-3,and the cations are mainly Ca2+,consistent with the percentage of milliequivalents in the original water samples.The hydrochemical types of the three sets of original water samples,along with the leachate and eluate,are predominantly of the Ca-Mg-HCO3 type.Additionally,a small amount of Ca-Mg-Cl-SO4 type is detected in the sandstone water and dolomitic water,closely aligning with the hydrochemical characteristics of the original water samples and the test simulation results.This study not only provides strong evidence for understanding the hydrochemical differences across geological periods but also offers experimental validation for sub-sequent water-rock interactions.Furthermore,it lays a foundation for the identification of water inrush sources and the utilization of mine water resources.
ground waterwater-rock interactionleaching testsoaking testhydrochemical characteris-ticsmine water inrush
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