Hydrochemical characteristics and source analysis of deep groundwater in Qianyingzi Coal Mine

Authors

CHEN Kai, School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, ChinaFollow
LIU Qimeng, School of Earth and Environment, Anhui University of Science & Technology, Huainan 232001, ChinaFollow
LIU Yu, State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science & Technology, Huainan 232001, China
PENG Weihua, Key Laboratory of Mine Water Resource Utilization of Anhui Higher Education Institutes, Suzhou University, Suzhou 232000, China
WANG Zitao, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
ZHAO Xiang, Key Laboratory of Mine Water Resource Utilization of Anhui Higher Education Institutes, Suzhou University, Suzhou 232000, China

Abstract

The shallow coal resources in China have been gradually depleted. Under the condition that the deep coal exploitation has been started, the threat from the high-artesian limestone water at the coal seam floor is greater. Deep understanding of the hydrochemical composition control mechanism in the aquifer of the mine area is an important scientific precondition for pertinently carrying out water hazard prevention and control. In order to find out the qualitative and quantitative sources of the conventional ions which in the deep ground water of the Anhui Qianyingzi Coal Mine, the 22 conventional ion concentrations in limestone water were analyzed through multiple mathematical statistics methods (including correlation analysis and R cluster analysis), the ionic ratio method and Unmix model. As indicated by the results, the ground water was medium to weak alkaline. The change range of the total dissolved solids (TDS) was 1 945 mg/L to 5 292 mg/L. Cations can be sequenced by their average mass concentrations (from the larger to the smaller) as: Na⁺ (717 mg/L), Ca²⁺ (270 mg/L) and Mg²⁺ (153 mg/L). Anions can be sequenced by their average mass concentrations as: SO₄ ²⁻ (2 305 mg/L), HCO₃ ⁻ (293 mg/L) and Cl⁻ (186 mg/L). The hydrochemical type of 95% samples was SO₄-Na. As indicated by the correlation analysis, cluster analysis and ionic ratio analysis, the hydrochemical composition control factors in the aquifer were mainly the dissolution of sulfate and carbonate minerals (source 1) as well as the dissolution of salt rock and the weathering of the silicate mineral (source 2). As shown in the Unmix model, the average contribution rates of the source 1 and source 2 to the conventional ion concentrations to the ground water were 56% and 44% respectively. The contribution rates of source 1 to the concentrations of Ca²⁺, Mg²⁺, Na⁺ and SO₄ ²⁻ were 73%, 68%, 63% and 73%, respectively. The contribution rates of source 2 to the concentrations of Cl⁻ and HCO₃ ⁻ were 75% and 66%, respectively. The study results can provide theoretical support for the accurate identification of the water bursting source in the coal mine with the similar conditions.

Keywords

deep groundwater, hydrochemical characteristics, source analysis, receptor model, Unmix model, Qianyingzi Coal Mine in Anhui

DOI

10.12363/issn.1001-1986.21.11.0631

Recommended Citation

CHEN Kai, LIU Qimeng, LIU Yu, et al. (2022) "Hydrochemical characteristics and source analysis of deep groundwater in Qianyingzi Coal Mine," Coal Geology & Exploration: Vol. 50: Iss. 8, Article 12.
DOI: 10.12363/issn.1001-1986.21.11.0631
Available at: https://cge.researchcommons.org/journal/vol50/iss8/12

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