文献类型： 外文期刊

第一作者： Zhang, Wenrui

作者： Zhang, Wenrui;Duan, Limin;Liu, Tingxi;Zhang, Wenrui;Duan, Limin;Liu, Tingxi;Duan, Limin;Liu, Tingxi;A, Yinglan;Xue, Baolin;Wang, Guoqiang

作者机构：

关键词： Hydrogeochemical evolution; Open-pit combined underground mining; activities; Mining impacts

期刊名称：JOURNAL OF CONTAMINANT HYDROLOGY （ 影响因子：4.4； 五年影响因子：4.1 ）

ISSN： 0169-7722

年卷期： 2024 年 267 卷

页码：

收录情况： SCI

摘要： Large-scale open-pit combined underground mining activities (OUM) not only reshape the original topography, geomorphology, and hydrogeochemical environment of the mining area, but also alter the regional water cycle conditions. However, due to the complexity arising from the coexistence of two coal mining technologies (open- pit and underground mining), the hydrological environmental effects remain unclear. Here, we selected the Pingshuo Mining Area in China, one of the most modernized open-pit combined underground mining regions, as the focus of our research. We comprehensively employed mathematical statistics, Piper diagram, Gibbs model, ion combination ratio, principal component analysis and other methods to compare the hydrochemistry and isotope data of different water bodies before (2006) and after (2021) large-scale mining. The changing patterns of hydrochemical characteristics of different water bodies and their main controlling factors in mining area driven by OUM were analyzed and identified, revealing the water circulation mechanism under the background of long-term coal mining. The results showed that: (1) The chemical composition of water has changed greatly due to large-scale coal mining. The hydrochemical types of Quaternary and Permian-Carboniferous aquifers shifted from predominantly HCO3-Ca center dot Mg 3-Ca center dot Mg before intensive mining to primarily HCO3 center dot SO4-Ca center dot Mg, 3 center dot SO 4-Ca center dot Mg, HCO3-Na, 3-Na, HCO3 center dot SO4-Na center dot Mg, 3 center dot SO 4-Na center dot Mg, and HCO3 center dot SO4-Ca center dot Mg, 3 center dot SO 4-Ca center dot Mg, HCO3-Ca center dot Na, 3-Ca center dot Na, HCO3 center dot SO4-Mg center dot Ca 3 center dot SO 4-Mg center dot Ca post-mining. Variations in the hydro- chemical types of surface water were found to be complex and diverse. (2) Coal mining activities promote the dissolution of silicate rock and sodium-bearing evaporites, enhancing the strength and scale of positive alternating adsorption of cations. The oxidation of pyrite, dissolution of silicate weathering, and the leaching of coal gangue were identified as the main reasons for the significant increase of SO 4 2- , while decarbonation in confined aquifers led to a decrease in HCO3-. 3- . (3) Results from the principal component analysis and stable isotopes demonstrated the hydraulic connection among surface water, Quaternary aquifers, and Permian-Carboniferous aquifers induced by long-term OUM. The research findings provide a reference basis for the coordinated development of coal and water in the Pingshuo Mining Area and other open-pit combined underground mining areas.

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