Hydrogeochemical Evolution and Control Mechanism of Underground Multiaquifer System in Coal Mine Area

Ju, Qiding; Hu, Youbiao; Wang, Yuquan; Liu, Qimeng; Wang, Zitao

doi:10.1155/2020/8820650

Cited by 10 publications

(10 citation statements)

References 37 publications

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“…Anions on the surface of rock particles can adsorb cations in groundwater, while Ca 2+ and Mg 2+ are characterized by strong adsorption capacity, which can replace Na + on the rock surface and, thus, their contents can be decreased in groundwater, that is, cation alternating adsorption (Ju et al, 2020; Sahoo and Khaoash, 2020; Voutsis et al, 2015). This is an important process for the formation of the chemical composition of groundwater.…”

Section: Resultsmentioning

confidence: 99%

Temporal variation of hydrogeochemical characteristics and processes of aquifers in the Liuqiao coal mine

Wang

Zhai

et al. 2022

Energy Exploration & Exploitation

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Studying the characteristics and hydrogeochemical evolution processes of groundwater can contribute to the prevention of water-related hazards and ensure sustainable management of groundwater resources. In this study, the hydrogeochemical characteristics and evolution processes of the coal-bearing sandstone aquifer and Carboniferous limestone aquifer of the Taiyuan formation in the Liuqiao coal mine in Huaibei coalfield were assessed using piper diagram, Gibbs diagrams, ionic proportion ratios, and principal component analysis (PCA). The results showed that Na+ + K+ and SO42− were the dominant cations and anion, respectively, in both aquifers. The coefficients of variation of six hydrochemical parameters increased gradually, reflecting the formation of different water chemical compositions. The formation of hydrochemical compositions was dominated by water-rock interaction, including the dissolution of rock salt, cation exchange adsorption and pyrite oxidation. In addition, the PCA revealed two first components, explaining the highest proportion of variance. Over time, the water sample points were mostly found in the second and third quadrants, indicating the groundwater salinization effect as a result of the gradual increase in the cation alternating adsorption.

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Section: Resultsmentioning

confidence: 99%

Temporal variation of hydrogeochemical characteristics and processes of aquifers in the Liuqiao coal mine

Wang

Zhai

et al. 2022

Energy Exploration & Exploitation

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“…(2) The aquifer water level decreases. (3) The aquifer water level restores after decreasing. Numerous experts and scholars have studied the aquifer water level behavior using different test methods and criteria.…”

Section: Introductionmentioning

confidence: 99%

“…Mining of shallow coal seams in areas with scarce water resources and environmental problems inevitably causes the overlying rock subsidence and groundwater level drop, jeopardizing the fragile ecological balance [1][2][3]. In particular, this refers to the arid and semiarid regions of western China, for which the water-preserving mining seems to be the most lucrative solution [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Aquiclude Stability Evaluation and Significance Analysis of Influencing Factors of Close-Distance Coal Seams: A Case Study of the Yili No. 4 Coal Mine in Xinjiang, China

et al. 2021

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Aquiclude stability is vital for the realization of water-preserving coal mining. And its evaluation, influencing factors, and their significance analysis are quite topical for the ecosystem conservation. The purpose of this paper was to establish an evaluation index system of weakly cemented aquiclude stability. An evaluation index system was built based on three evaluation factors (subsidence, seepage, and deformation), three subfactors (subsidence gradient, seepage rate, and horizontal deformation), and four evaluation criteria (unstable, weakly stable, medium stable, and stable). The evaluation method was applied to evaluate the index for the case study of Yili No. 4 Coal Mine in Xinjiang, China. Based on the geological conditions of the close-distance coal seams in the mine under study, the main influencing factors and subordinate functions of evaluation index S t a were analyzed. The above three factors’ weights were assessed as 0.1095, 0.3090, and 0.5815, respectively, and the proposed evaluation method’s feasibility was verified by the water level variation in the observation hole. The range and variance analyses were performed to assess the significance of the mining heights of the upper and lower coal seams and the coal seam spacing. The results showed that the aquiclude stability negatively correlated with the mining heights and positively correlated with the coal seam spacing. The decreasing order of influence significance on the aquiclude stability was as follows: upper coal seam mining height, lower coal seam mining height, and coal seam spacing. Water protection mining was an effective measure to control the S t a , and the findings provided a reference value and academic significance for the ecosystem conservation.

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“…Despite the continuous increase in the production and use of new energy, coal still plays a key role in the global fossil fuel supply system (Chen et al, 2014; Bi et al, 2021; Ju et al, 2020; Dong et al, 2020). It is the major energy source for electricity, residential heating, and industrial production in most countries (Qiao et al, 2019; Yin et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

Wang¹,

Wang³

et al. 2022

Energy Exploration & Exploitation

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Coal mining at deep levels can cause mine water inrush and groundwater contamination, making it important to accurately and rapidly identify the water inrush source. In this study, 52 water samples were extracted from three types of aquifers in the Linhuan mining area, China. The water sample components Na+ + K+, Ca2+, Mg2+, HCO3−, Cl−, and SO42−, measured in the experiment, were used as evaluation variables, and the piecewise function equation was established by using the exponential whitening function. Finally, combined with water sample data and the CRITIC weighted grey situation decision-making method, the comprehensive membership degree was obtained, and the water inrush source was identified according to the principle of the maximum membership degree. The comprehensive accuracy of the model was 92.3%. The traditional grey situation decision-making method uses the linear whitening function to determine the membership value, ignoring that the value of the whitening function outside the adjacent level is 0, which improves the weight of the adjacent level, causes the loss of effective information, and reduces the discrimination rate. The exponential whitenization function in this paper will solve this problem and further improves the grey situation decision-making method to discriminate the water inrush source, which would also be beneficial regarding the prevention and control of mine water inrush and groundwater contamination.

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Hydrogeochemical Evolution and Control Mechanism of Underground Multiaquifer System in Coal Mine Area

Cited by 10 publications

References 37 publications

Temporal variation of hydrogeochemical characteristics and processes of aquifers in the Liuqiao coal mine

Temporal variation of hydrogeochemical characteristics and processes of aquifers in the Liuqiao coal mine

Aquiclude Stability Evaluation and Significance Analysis of Influencing Factors of Close-Distance Coal Seams: A Case Study of the Yili No. 4 Coal Mine in Xinjiang, China

Source identification of mine water inrush based on the exponential whitenization function and the grey situation decision model

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