Retracement Ground Pressure Appearance and Control of the Working Face under the Overlying Residual Pillar: A Case Study

Yongqiang Zhang, Xiangyu Wang (), Feiteng Zhang, Menglong Li, Guanghui Wang, Dingchao Chen, Guanjun Li and Xiangqian Zhao
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Yongqiang Zhang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Xiangyu Wang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Feiteng Zhang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Menglong Li: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Guanghui Wang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Dingchao Chen: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Guanjun Li: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Xiangqian Zhao: School of Mines, China University of Mining & Technology, Xuzhou 221116, China

Energies, 2023, vol. 16, issue 4, 1-21

Abstract: On the working face below shallow and close coal seams, there are residual pillars. The mine’s ability to operate safely is constrained by the coal pillars’ vulnerability to sudden instability and powerful ground pressure disasters during withdrawal. This paper uses the 31,106 working face of the Huoluowan coal mine as its research backdrop and employs field observation, theoretical analysis, and numerical simulation to examine the strong dynamic load mechanism of the overlying coal pillars. According to the analysis, the residual pillar’s stress diffusion angle is 29 degrees after mining the working face above it, which has an impact on the main roof’s stability above the working face’s retracement roadway. The main roof is impacted by the excavation disturbance and the remaining pillars during the working face’s final mining phase, displaying a complex stress superposition state. The retracement roadway is significantly deformed as a result of the plastic zone of the surrounding rock changing from small-scale damage to extensive damage. The proposed “hydraulic roof cutting + reinforcement support” prevention technology is based on the prevention idea of weakening important rock strata, changing the stress transmission path, and strengthening adjacent rock. Field testing shows how hydraulic fracturing reinforces the roof structure, lessens the heavy dynamic load on the supporting pillars of overlying residual coal, reduces rock deformation in the retracement roadway, and ensures the stability of the working face during withdrawal. The study’s findings are significant for the secure removal of a working face under similar circumstances.

Keywords: residual pillar; retracement roadway; rock pressure; hydraulic fracturing (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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