Spatiotemporal evolutionary patterns of the hydrochemistry of Jurassic conglomerate aquifers under the influence of curtain walls

Authors

CHEN Luwang, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, ChinaFollow
WU Minghui, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
HOU Xiaowei, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
HU Yongsheng, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
ZHANG Miao, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
CAI Xinyue, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
YIN Xiaoxi, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
SHI Xiaoping, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China

Abstract

Objective Curtain walls, recognized as a primary project for the prevention and control of water disasters in coal mines, will change the dynamic field of groundwater. Furthermore, their dissolution will affect the chemical field of groundwater, leading to variations in its hydrochemical composition. Methods This study investigated the Jurassic conglomerate aquifers in the Zhuxianzhuang Coal Mine, Huaibei coal field. Based on the statistics of conventional hydrochemical composition, Piper diagrams, ion combination proportions, and principal component analysis (PCA), this study explored the impacts of curtain walls on the hydrochemistry of the aquifers and determined the spatiotemporal hydrochemical evolutionary patterns under the influence of the curtain walls. Results and Conclusions The results indicate that the hydrochemical characteristics differ greatly between inside and outside the curtain walls, with the groundwater inside the curtain walls exhibiting elevated Ca²⁺ and Mg²⁺ concentrations compared to that outside the curtain walls. After the construction of the curtain walls, the hydrochemical processes are dominated by the dissolution of the curtain walls based on the leaching and dissolution of calcite (CaCO₃) and dolomite (CaMg(CO₃)₂), accompanied by varying degrees of pyrite oxidation, alternating adsorption of cations, and desulfurization. Influenced by mining, the dissolution of the curtain walls produces significantly enhanced impacts on groundwater within them, with the dissolution of the northern curtain wall relatively weaker than that of the eastern counterpart. The results of this study will provide theoretical support for the monitoring and protection of curtain walls and the environmental protection of groundwater.

Keywords

Jurassic conglomerate aquifer, curtain wall, dissolution, hydrochemical evolution, Zhuxianzhuang Coal Mine

DOI

10.12363/issn.1001-1986.24.10.0633

Recommended Citation

CHEN Luwang, WU Minghui, HOU Xiaowei, et al. (2025) "Spatiotemporal evolutionary patterns of the hydrochemistry of Jurassic conglomerate aquifers under the influence of curtain walls," Coal Geology & Exploration: Vol. 53: Iss. 1, Article 14.
DOI: 10.12363/issn.1001-1986.24.10.0633
Available at: https://cge.researchcommons.org/journal/vol53/iss1/14

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