High Mining Face Flexible Reinforcement to Prevent Coal Wall Spalling by Cuttable Aluminum–Plastic Pipe Pre-Grouting

Huazhe Jiao, Wenbo Yang, Xinming Chen, Liuhua Yang and Zhen Li
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Huazhe Jiao: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Wenbo Yang: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Xinming Chen: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Liuhua Yang: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Zhen Li: School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Energies, 2022, vol. 15, issue 9, 1-20

Abstract: A larger mining height leads to easy caving of the coal wall in the working face. The flexible reinforcement method during the mining period of the working face affects the normal mining of the working face, and the high strength of the traditional bolt/cable material affects the operation of the shearer drum, so it is necessary to seek a reinforcement material which does not affect the production and the drum coal cutting. This paper proposed a technical scheme of coal wall reinforcement by pre-grouting with a cuttable aluminum–plastic composite pipe which is easy to cut during mining in the working face, tested the mechanical properties of the “grouting + flexible pipe” specimen, and obtained the optimal support spacing by numerical simulation and carrying out an industrial test. The results show that the tensile strength of aluminum–plastic composite pipe is much higher than that of coal spalling and the elongation is much higher than that of the anchor rod. When double-row composite grouting holes are arranged 1.5 and 3.0 m away from the roof, the supporting effect is better. Underground grouting shows that pre-grouting before mining according to the advancing speed of the working face 10–14 days in advance can effectively fill the coal cracks and significantly improve the integrity of the coal wall.

Keywords: large mining height working face; coal wall spalling; advance pre-grouting; flexible reinforcement; aluminum–plastic composite pipe; numerical simulation (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: 2022
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