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Deformation Mechanism and Control Technology of Coal Roadway with Thin Sand-mudstone Interbed Roof

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Abstract

With the aim of solving the large deformation problem of surrounding rock in coal mine roadways with a thin sand-mudstone interbed roof, transportation roadway 1603 in Haoyuan Mine was considered. The failure mechanism of surrounding rock was studied through comprehensive on-site investigations, borehole image analysis, mineral composition analysis, and other means. Numerical simulations were performed to determine the influence of roof layer thickness, lateral pressure coefficient, and coal rib strength on the stability of the interbedded roof. The main reasons for support failure and deformation of the roadway are softening and swelling of the sand-mudstone interbed roof upon exposure to water, insufficient support capacity of the roof due to the soft coal rib, an unreasonable support scheme, or poor construction quality, which can reduce the bearing capacity of surrounding rock. Based on our analysis, a control strategy was devised for a thin coal-mudstone interbed roof. The support scheme combines long and short cable support, strengthening of the coal rib to consolidate the roof, and partially shotcrete grout, and was found to improve the overall mechanical strength of surrounding rock and maintain the stability of the thin sand-mudstone interbed roof. The results of the numerical simulations and monitoring data indicated that the proposed support scheme effectively controls the deformation of the surrounding rock of thin sand-mudstone interbed roof of coal mine roadways while maintaining the safety and stability of the surrounding rock and supporting structure.

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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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Acknowledgements

We would like to thank MogoEdit (https://www.mogoedit.com) for its English editing during the preparation of this manuscript.

Funding

This research is supported by the Natural Science Foundation of China (Grant no. 52174095,51804310).

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Authors and Affiliations

  1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Hai Lin, Renshu Yang & Shizheng Fang

  2. School of Energy and Mining Engineering, China University of Mining and Technology Beijing, Beijing, 100083, China

    Yongliang Li

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  1. Hai Lin
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  2. Renshu Yang
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Correspondence to Hai Lin.

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Lin, H., Yang, R., Li, Y. et al. Deformation Mechanism and Control Technology of Coal Roadway with Thin Sand-mudstone Interbed Roof. Mining, Metallurgy & Exploration 40, 421–433 (2023). https://doi.org/10.1007/s42461-022-00707-9

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