Strata Movement of Overburden-Separation Grouting Working Face and Its Influence on Gas Emission during Mining

Junwen Cao, Ting Liu (), Yu Shi, Baiquan Lin, Jiahao Shen, Youping Xu, Xiangming Gong and Yanchi Liu
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Junwen Cao: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Ting Liu: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yu Shi: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Baiquan Lin: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Jiahao Shen: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Youping Xu: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Xiangming Gong: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yanchi Liu: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

Sustainability, 2023, vol. 15, issue 17, 1-19

Abstract: Due to its excellent effect of surface subsidence reduction, the overburden-separation grouting (OSG) technology has been widely applied to green mining. However, OSG changes the mine pressure, and the resultant gas emission in the stope remains unclear. Therefore, with the 22301 working face of Tunlan Coal Mine as an example, the overburden deformation and stress distribution in the absence and presence of OSG were studied through numerical simulation and on-site tests. Furthermore, the gas emission law in the stope was contrastingly analyzed. The following results were obtained. With the rise of grouting pressure (GP), the subsidence of strata above the separation layer decreases while that below the separation layer increases; the heave displacement of floor strata below the coal seam gradually decreases. OSG significantly changes the geometric shape and range of the overburden stress relief zone. As the GP rises, the gas enrichment area moves downward continuously and shrinks spatially. Horizontally, the ranges of the stress relief zone and the free space in the goaf shrink, while the range and compaction degree of the compaction area gradually grow. After OSG, the total amount of gas emission in the working face falls by 52.2%.

Keywords: overburden-separation grouting; overburden stress distribution; strata movement; gas emission; gas control (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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