Hydrogeochemistry of Water in Coal Measures during Grouting Treatment of Taoyuan Mine,China |
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| Authors: | Yan Guo Herong Gui Jiuchuan Wei Zhi Zhang Mancong Hu Pei Fang Guangping Li Chuan Gao Xin Wang |
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| Institution: | 1. College of Earth Science and Engineering, Shandong University of Science and Technology, No. 579 Qianwangang Road, Huangdao District, Qingdao, Shandong, 266590 China;2. National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, No. 49 Bianhe Middle Road, Suzhou, Anhui, 234000 China;3. Taoyuan Coal Mine of Huaibei Mining Co. Ltd, South of Yangzhai Village, Suzhou, Anhui, 234000 China;4. Qianyingzi Coalmine of Wanbei Coal-Electricity Group Co. Ltd, South of Yangzhai Village, Suzhou, Anhui, 234000 China |
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| Abstract: | Permian coal measure sandstone fissure water (referred to as “coal measure water,” that is, water in coal measures) is one of the important water sources for industrial and agricultural activities in mining areas. However, the regional high-pressure grouting, one of the most widely used floor control methods, may affect the coal measure water which is connected with limestone aquifer. This study used Taoyuan mine, a typical coal mine in Huaibei coalfield, as the research area to study the influencing mechanism of a grouting treatment on the hydrogeochemical evolution of coal measure water. The hydrogeochemical characteristics and water-rock interaction mechanism of the coal measure water before and during the treatment were evaluated using a Piper trigram, ion combination ratio, and hydrogen-oxygen stable isotope. The anions and cations in the coal measure water before and during the treatment had the same trends at SO42? > HCO3? > Cl? and Na+ > Ca2+ > Mg2+, respectively. Hydrochemical types of coal measure water before treatment were mainly SO4·Cl-Ca·Mg, SO4·Cl-Na, and HCO3-Na, and during treatment they were mainly SO4·Cl-Na and HCO3-Na. The formation of chemical components of coal measure water before treatment was mainly caused by carbonate dissolution, sulfate dissolution, and pyrite oxidation. During the treatment, sulfate dissolution and pyrite oxidation were the main geochemical processes, and ion exchange was enhanced. Atmospheric precipitation was the source of all water samples, and all showed an obvious 18O drift. |
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