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Effect of multi-factor dynamic loading on gob-side entry driving during longwall face extraction: a case study

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Abstract

As underground mining advances to the deep, roadway control has become crucial for the development of modern mines with high yield and high efficiency. This study is aimed at protecting the roadway from dynamic disasters. To achieve this aim, the strain-softening parameters of coal pillars were determined by means of numerical simulation and onsite measurement. Furthermore, the response characteristics of roadway surrounding rock (RSR) under multi-factor dynamic loading were investigated. The following beneficial results were obtained: (1) the response of RSR gradually weakens with the increase in the distance of dynamic loading source; (2) the response of RSR displays a time attenuation effect with the passage of dynamic loading time; (3) RSR is greatly influenced by the variation of dynamic loading amplitude; (4) the influence of dynamic loading frequency on RSR is ignorable. Dynamic loading amplitude is the most sensitive variable for the response of RSR based on importance score. Finally, a collaborative control technology of “pre-unload + slow yield + strong support” was designed, and its effectiveness was verified through onsite monitoring and numerical simulation.

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Funding

This work was supported by the National Natural Science Foundation of China (grant number: 52074266).

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Authors and Affiliations

  1. State Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, 221116, Jiangsu, China

    Jiakun Lv, Zhijun Wan, Yuan Zhang, Junhui Wang, Wanzi Yan & Luchang Xiong

  2. School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

    Jiakun Lv, Zhijun Wan, Yuan Zhang, Junhui Wang, Wanzi Yan & Luchang Xiong

Authors
  1. Jiakun Lv
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  2. Zhijun Wan
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  3. Yuan Zhang
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  4. Junhui Wang
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  5. Wanzi Yan
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  6. Luchang Xiong
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Contributions

Jiakun Lv: software, writing-original draft, writing-review and editing; Zhijun Wan: conceptualization, methodology, supervision, software; Yuan Zhang: funding acquisition; Junhui Wang: numerical simulation analysis; Wanzi Yan: machine learning analysis; Luchang Xiong: theoretical calculation.

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Correspondence to Zhijun Wan.

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Lv, J., Wan, Z., Zhang, Y. et al. Effect of multi-factor dynamic loading on gob-side entry driving during longwall face extraction: a case study. Bull Eng Geol Environ 81, 409 (2022). https://doi.org/10.1007/s10064-022-02880-z

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  • DOI: https://doi.org/10.1007/s10064-022-02880-z

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