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Failure mechanism of gob-side roadway in deep coal mining in the Xinjie mining area: Theoretical analysis and numerical simulation

新街矿区深部开采邻空巷道的破坏机理: 理论分析和数值模拟

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Abstract

In deep coal mining, complex stress and mining conditions often cause large deformation and roof falling of roadway, which seriously threatens the production safety of coal mines. This study investigated the stress characteristics, failure mechanism, and control methods of gob-side roadway (GSR) at Hongqinghe Coal Mine in the Xinjie deep mining area, Inner Mongolia, China. The long and short arm F-shaped roof structure models during the different mining stages for the first working face were established. The stress calculation methods for GSR surrounding rock were proposed based on foundation static load (FSL), mining-induced additional static load (MIASL), and disturbance dynamic load (DDL). Moreover, the stability of GSR was analyzed. The failure mechanism of GSR was revealed. It was concluded that the GSR failure may occur due to the high stress and energy induced by the additive effects of the FSL, the MIASL, and the DDL. The coal pillar width of 5–10 m can provide a low stress environment for GSR, conducive to reducing the risk of GSR failure. The suitable control methods for GSR were proposed, which included selecting reasonable coal pillar widths, cutting off the dynamic load sources, reducing the static load stress concentration, and application of energy-absorbing bolts. The findings may provide valuable insights for controlling roadway surrounding rock in similar conditions.

摘要

深部煤炭开采时复杂的应力环境和开采条件容易引起巷道大变形和顶板冒落, 严重威胁煤矿生产安全。本文研究了内蒙古新街矿区红庆河煤矿首采工作面开采时邻空巷道应力特征、破坏机理及围岩控制方法。建立了首采工作面不同开采阶段顶板长、短臂F 型结构模型, 基于基础静载荷、采动附加静载荷和扰动动载荷提出了邻空巷道围岩应力计算方法。此外, 分析了邻空巷道围岩稳定性, 揭示了邻空巷道破坏机理。研究结果表明:基础静载荷、采动附加静载荷和扰动动载荷叠加时形成高应力、能量区, 易诱发邻空巷道破坏;煤柱宽度为5~10 m时邻空巷道处在低应力环境, 可有效降低邻空巷道破坏风险。同时, 提出了邻空巷道围岩控制方法, 主要包括选择合理煤柱宽度、切断动载荷来源、降低静载应力集中程度及应用吸能锚杆。本文研究结果可为类似条件巷道围岩控制提供参考。

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Authors and Affiliations

  1. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Yi-xin Zhao  (赵毅鑫), Cun Zhang  (张村), Chun-wei Ling  (令春伟) & Wen-chao Liu  (刘文超)

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

    Yi-xin Zhao  (赵毅鑫), Jin-long Zhou  (周金龙), Cun Zhang  (张村), Chun-wei Ling  (令春伟), Wen-chao Liu  (刘文超) & Chu-jian Han  (韩楚健)

  3. CCTEG Coal Mining Research Institute, Beijing, 100013, China

    Jin-long Zhou  (周金龙)

  4. Department of Civil Engineering, Técnico Lisboa, University of Lisbon, Lisbon, 1049-001, Portugal

    Jin-long Zhou  (周金龙)

  5. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines (Anhui University of Science and Technology), Huainan, 232001, China

    Bin Liu  (刘斌)

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Contributions

The overarching research goals were developed by ZHAO Yi-xin and ZHOU Jin-long. ZHOU Jin-long and ZHANG Cun established the calculation models. LING Chun-wei and LIU Wen-chao analyzed the calculated results. The initial draft of the manuscript was written by ZHOU Jin-long. LIU Bin and HAN Chu-jian edited the draft of the manuscript. All authors replied to reviewers’ comments and revised the final version.

Corresponding authors

Correspondence to Yi-xin Zhao  (赵毅鑫) or Jin-long Zhou  (周金龙).

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Conflict of interest

ZHAO Yi-xin, ZHOU Jin-long, ZHANG Cun, LIU Bin, LING Chun-wei, LIU Wen-chao, and HAN Chu-jian declare that they have no conflict of interest.

Foundation item: Projects(U1910206, 51874312) supported by the National Natural Science Foundation of China; Project(202006430014) supported by the China Scholarship Council

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Zhao, Yx., Zhou, Jl., Zhang, C. et al. Failure mechanism of gob-side roadway in deep coal mining in the Xinjie mining area: Theoretical analysis and numerical simulation. J. Cent. South Univ. 30, 1631–1648 (2023). https://doi.org/10.1007/s11771-023-5315-7

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  • DOI: https://doi.org/10.1007/s11771-023-5315-7

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