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Long-Distance Advanced Pre-grouting Layer Flexible Reinforcement Mechanism and Its Application in Large Mining Height Coal Face

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Abstract

In terms of the technical problems of rib spalling in large mining height coal face, a long-distance advanced pre-grouting layer flexible reinforcement technology is proposed in this paper. Based on the mechanism and failure mode of rib spalling in the coal face, the mechanical properties of the aluminum plastic composite pipe were analyzed by using the tensile and compression experiment. The deformation and strength characteristics of “flexible pipe + grouting” specimens were studied by uniaxial compression test, splitting test, and shear test. The UDEC numerical simulation software was used to simulate the reinforcement effect of “flexible pipe + grouting” at different positions. Combined with the field application, the feasibility of long-distance advanced pre-grouting layer flexible reinforcement technology was verified. The test results show the following: The coal face has the characteristics of brittle and large deformation. The aluminum plastic composite pipe has the characteristics of good elongation and tensile strength, which can endure the large deformation of the coal face. The “flexible pipe + grouting” can improve the tensile and shear strength of coal. The UDEC numerical simulation analysis indicated that the grouting hole layout of “flexible pipe + grouting” has a significant difference in the reinforcement effect of the coal face. Compared with single row grouting reinforcement, the reinforcement effect of double row grouting holes 1.5 m and 3.0 m away from the roof is better. According to the field application, it is feasible to use aluminum plastic composite pipe as a flexible grouting pipe to reinforce coal seam with 80–100 m long-distance pre-grouting. Long-distance advanced pre-grouting layer flexible reinforcement technology can improve the daily production of coal and reduce the support cost of the coal face. As a new method of reinforcement, long-distance layered flexible reinforcement has a significant effect on the prevention and treatment of rib spalling in large mining height coal face.

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Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This study was supported by the National Natural Science Foundation of China (51874123), the Scientific and Technological Research Projects of Henan Province China (182102310012), and the Support Plan for Scientific and Technological Innovation Talents in Colleges and Universities of Henan Province China (19HASTIT047).

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Authors and Affiliations

  1. School of Civil Engineering, Henan Polytechnic University, Henan, 454000, China

    Shaoyang Yan, Huaibao Chu, Huazhe Jiao, Xinming Chen & Chang Wang

  2. Underground Engineering and Disaster Prevention Key Laboratory of Henan Province, Henan Polytechnic University, Jiaozuo, 454000, China

    Huaibao Chu & Huazhe Jiao

Authors
  1. Shaoyang Yan
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  2. Huaibao Chu
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  3. Huazhe Jiao
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  4. Xinming Chen
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  5. Chang Wang
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Correspondence to Huazhe Jiao.

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Yan, S., Chu, H., Jiao, H. et al. Long-Distance Advanced Pre-grouting Layer Flexible Reinforcement Mechanism and Its Application in Large Mining Height Coal Face. Mining, Metallurgy & Exploration 39, 2379–2392 (2022). https://doi.org/10.1007/s42461-022-00677-y

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  • DOI: https://doi.org/10.1007/s42461-022-00677-y

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