Study on the Pressure-Bearing Law of Backfilling Material Based on Three-Stage Strip Backfilling Mining

Xiaoping Shao, Xin Li, Long Wang, Zhiyu Fang, Bingchao Zhao, Ershuai Liu, Yeqing Tao and Lang Liu
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Xiaoping Shao: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Xin Li: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Long Wang: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Zhiyu Fang: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Bingchao Zhao: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Ershuai Liu: Shaanxi Coal Yubei Coal Industry Co., Ltd., Yulin 719000, China
Yeqing Tao: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Lang Liu: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2020, vol. 13, issue 1, 1-16

Abstract: During strip backfilling mining in coal mines, the backfilling material is the main support structure. Therefore, studying the pressure law of the backfilling material is essential for the safe and efficient mining of coal resources. Based on research into strip backfilling mining at working face number 3216 of the Shanghe Coal Mine, and to smooth transition of overlying strata loads to the backfilling material, this study proposes a three-stage strip backfilling mining method. Based on thin-plate theory, an elastic thin-plate model, a reasonable spacing of strip mining is constructed, and the reasonable mining parameters of “mining 7 m to retain 8 m” at working face number 3216 of the Shanghe Coal Mine are determined. The law of backfilling pressure in three-stage strip backfilling mining is studied through numerical simulation and physical simulation experiments. The results show that field measurement results are basically consistent with the experimental results and numerical simulation results. When three-stage strip backfilling mining is adopted, the stage-one backfilling material is the main bearing body to which the overlying rock load transfers smoothly and gradually, and the structure of the “overburden-coal pillar (or backfilling strip)” in the stope remains stable. In three-stage strip backfilling mining, the overlying rock load is ultimately transferred to the stage-one backfilling material, the stage-two backfilling material is the auxiliary bearing body, and the stage-three backfilling material mainly provides long-term stable lateral support for the stage-one backfilling material.

Keywords: strip backfilling mining; thin-plate theory; backfilling material; numerical simulation; pressure in the backfilling material (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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