Abstract
Mining activities interfere into the natural groundwater chemical environment, which may lead to hydrogeochemical changes of aquifers and mine water inrush disasters. The study of hydrogeochemical evolution processes of underground aquifers is helpful to the prevention and control of mine water inrush. The results show that the study area is mainly impacted by four hydrogeochemical processes: dissolution, cation exchange, desulfurization and reduction, and pyrite oxidation. The Cenozoic aquifers are dominated by carbonate dissolution and desulfurization. The Permian aquifers are impacted mainly by cation exchange and sulfate dissolution, followed by pyrite oxidation. The Carboniferous aquifers are mainly impacted by dissolving sulfate, followed by pyrite oxidation and cation exchange. The hydrogeochemical evolution of the aquifers was controlled by mining activities and tectonic changes, and a certain regularity in space. For the Cenozoic aquifers, sulfate dissolution and cation exchange increase from west to east, and desulfurization weakens. For the Permian aquifers, cation exchange and sulfate dissolution are stronger near synclines and faults, pyrite oxidation is enhanced, and desulfurization decreases from the middle to the east of the mining area. For the Carboniferous aquifers, there is a higher dissolution of rock salt, pyrite oxidation, and cation exchange from west to east, and the desulfurization effect weakens.
Highlights
Human activities have led to different deterioration trends in the global groundwater environment; this trend is developing in a negative direction [1,2,3]
As the aquifer connects with the structure, different aquifers connect to form a water filling channel, which causes water inrush accidents and water pollution [4, 5]
This highlights the importance of studying water quality types and the hydrogeochemical evolution characteristics of underground aquifers, which can provide the basis for the safe production of coal mines and the full utilization of water resources
Summary
Human activities have led to different deterioration trends in the global groundwater environment; this trend is developing in a negative direction [1,2,3]. As the aquifer connects with the structure, different aquifers connect to form a water filling channel, which causes water inrush accidents and water pollution [4, 5] This highlights the importance of studying water quality types and the hydrogeochemical evolution characteristics of underground aquifers, which can provide the basis for the safe production of coal mines and the full utilization of water resources. Gomo et al [13] used the traditional hydrochemical analysis method to describe the underground hydrogeochemical process of a submerged mine and analysed the groundwater chemical types and water quality evolution. The study focused on identifying the hydrogeological and geochemical characteristics and control factors of water-filled aquifers It provides a scientific basis for accurately identifying potential water inrush hazard sources and a basis for the rational protection and utilization of water resources. This method has a certain guiding significance for the concealed coalfields in North China
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