Study on the Influence of Mining Activities on the Quality of Deep Karst Groundwater Based on Multivariate Statistical Analysis and Hydrochemical Analysis

Chen Li, Herong Gui (), Yan Guo, Jiayu Chen, Jun Li, Jiying Xu and Hao Yu
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Chen Li: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Herong Gui: National Engineering Research Center of Coal Mine Water Hazard Controlling, Suzhou University, Suzhou 234000, China
Yan Guo: School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, China
Jiayu Chen: School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Jun Li: National Engineering Research Center of Coal Mine Water Hazard Controlling, Suzhou University, Suzhou 234000, China
Jiying Xu: School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, China
Hao Yu: School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, China

IJERPH, 2022, vol. 19, issue 24, 1-21

Abstract: Long-term mining activities have changed the hydrogeochemical evolution process of groundwater and threatened the safe use of groundwater. By using the methods of hydrochemistry and multivariate statistical analysis, this study determined the hydrogeochemical evolution mechanism affecting the quality of karst groundwater by analyzing the conventional hydrochemistry data of the karst groundwater of the Carboniferous Taiyuan Formation in Hengyuan Coal Mine in the recent 12 years. The results show that, under the disturbance of mining, the quality of karst groundwater in Taiyuan Formation is poor, mainly because the contents of Na + +K + and SO 4 2− are too high to allow usage as drinking water. The reason for the high content of SO 4 2− in karst groundwater lies in the dissolution of gypsum and the oxidation of pyrite, and the high content of Na + +K + lies in the cation exchange. Influenced by the stratum grouting, the circulation of karst groundwater is improved, the cation exchange is weakened, and the desulfurization is enhanced. In the future, it is predicted that the hydrochemical type of karst groundwater in Taiyuan Formation in the study area will evolve from SO 4 -Ca·Mg type to HCO 3 -Ca Mg type.

Keywords: karst groundwater; mining disturbance; hydrogeochemical evolution; fuzzy comprehensive evaluation; principal component analysis (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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