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Volume 10
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10.3390/pr10091806
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Article

Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining

by
Wenmiao Wang
1,2,
Yong Yuan
1,2,*,
Xiaokang Liang
1,2,3,*,
Zhenghan Qin
1,2,
Zhongshun Chen
1,2,
Ke Ding
2,4,
Yongqi Xia
1,2 and
Chenlong Yan
1,2
1
Key Laboratory of Deep Coal Resource, Ministry of Education of China, China University of Mining & Technology, Xuzhou 221116, China
2
School of Mines, China University of Mining & Technology, Xuzhou 221116, China
3
Shaanxi Energy Fengjiata Mining Operation Co., Ltd., Yulin 719400, China
4
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China
*
Authors to whom correspondence should be addressed.
Processes 2022, 10(9), 1806; https://doi.org/10.3390/pr10091806
Submission received: 2 August 2022 / Revised: 1 September 2022 / Accepted: 5 September 2022 / Published: 7 September 2022
(This article belongs to the Special Issue Fracking and Permeability Enhancement in Fractured Rock Masses for Underground Mining)
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Abstract

Deep mining has started in the Huaibei mining area, and the serious threat of high confined water on the floor to the coal seam is gradually increasing. Based on the deep confined water mining project at working face II633 of the Hengyuan coal mine, this paper theoretically analyzes the damage depth of the floor and the risk of water inrush from the floor. The best proportion of grouting materials was quantitatively optimized by indoor experiments, and an industrial field test was conducted to judge the grouting effect. The results show that the failure depth of the bottom plate calculated by theoretical analysis is 31.73 m; a single factor test and a response surface optimization design method determined the best value of each index: water cement ratio 0.8, bentonite 2%, water reducer 0.6%, sodium silicate 2%. The damage depth of the bottom plate after grouting is 18.83~20 m, according to the field monitoring by the strain method. The optimized slurry significantly reduces the damage depth of the floor, ensures the safe and efficient mining of the coal seam above the high–pressure water, and has a high reference value for the safe mining of the coal seam under similar geological conditions.
Keywords: mining above confined water; response surface design; optimization of slurry ratio; field measurement mining above confined water; response surface design; optimization of slurry ratio; field measurement

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MDPI and ACS Style

Wang, W.; Yuan, Y.; Liang, X.; Qin, Z.; Chen, Z.; Ding, K.; Xia, Y.; Yan, C. Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining. Processes 2022, 10, 1806. https://doi.org/10.3390/pr10091806

AMA Style

Wang W, Yuan Y, Liang X, Qin Z, Chen Z, Ding K, Xia Y, Yan C. Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining. Processes. 2022; 10(9):1806. https://doi.org/10.3390/pr10091806

Chicago/Turabian Style

Wang, Wenmiao, Yong Yuan, Xiaokang Liang, Zhenghan Qin, Zhongshun Chen, Ke Ding, Yongqi Xia, and Chenlong Yan. 2022. "Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining" Processes 10, no. 9: 1806. https://doi.org/10.3390/pr10091806

APA Style

Wang, W., Yuan, Y., Liang, X., Qin, Z., Chen, Z., Ding, K., Xia, Y., & Yan, C. (2022). Experimental Study on Floor Damage and Slurry Material Ratio Optimization in Deep and High Confined Water Mining. Processes, 10(9), 1806. https://doi.org/10.3390/pr10091806

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