Classification and Design of Backfill Coal Mining Systems Based on Typical Engineering Cases

Pengfei Cui, Qiang Zhang (), Kang Yang, Haonan Lv, Jinming Cao and Wei Wang
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Pengfei Cui: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Qiang Zhang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Kang Yang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Haonan Lv: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Jinming Cao: School of Mines, China University of Mining & Technology, Xuzhou 221116, China
Wei Wang: School of Mines, China University of Mining & Technology, Xuzhou 221116, China

Energies, 2023, vol. 16, issue 24, 1-17

Abstract: Backfill coal mining technology has drawn widespread attention due to its benefits of “controlling surface deformation and subsidence, reducing mining-induced disturbance in the stope, and recycling solid mine wastes”. However, the backfill coal mining technology is still progressing slowly in China. The geological environment of China’s mining areas is complex and highly diversified, and backfill coal mining is expected to fulfill different goals in a wide range of engineering scenarios. These facts explain the poor reproducibility of backfill coal mining projects. This study reviews the existing backfill coal mining systems in China. Based on findings from a survey of engineering cases, we summarize five types of new backfill coal mining methods classified by deployment style; namely, borehole grouting backfill, roadway backfill, borehole–roadway backfill, in situ backfill, and roadway-in-situ backfill. A total of 15 backfill coal mining methods falling into the above five categories are described. An engineering design workflow for backfill coal mining consisting of five steps is proposed; namely, identifying the targets of backfill, analyzing the feasibility of deploying the backfill system, comparing the engineering quantities of different engineering schemes, estimating the economic efficiency of backfill, and backfill performance tracking and monitoring. Real cases of backfill engineering design are analyzed to inform the fast and reasonable design of backfill strategy for specific working faces in certain coal mines.

Keywords: backfill coal mining; backfill system deployment; backfill engineering design; borehole grouting backfill; roadway backfill; borehole–roadway backfill; in situ backfill; in situ roadway backfill (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 complete reference list from CitEc
Citations: View citations in EconPapers (1)

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