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Roof control mechanism and partition compensation support technology of gob-side entry formed by N00 mining method in thin coal seam

薄煤层N00 工法巷道顶板控制机理及分区补偿支护技术

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Abstract

To achieve scientific and accurate support for the roadway roof in the N00 mining method for thin coal seams, the roof-cutting self-forming roadway is divided into two stages: the advanced chamber stage (Stage I) and the roof collapse and roadway formation stage (Stage II), considering its technological process and the characteristics of roof deformation. Using the Hoek-Brown nonlinearity rock mass strength failure criterion, we derive the formula for the required pre-tension force of anchor bolts/cables at different stages of the roof. Additionally, a design approach is proposed for determining the necessary pretension force and length of anchor bolts and cables. Moreover, the supporting mechanism of anchor bolts/cables and the impact of different supporting combinations on the stress distribution of the surrounding rock are obtained through numerical simulations, elucidating the influence of key parameters in the design of anchor bolts/cables on roof stability. Finally, the partition compensation support technology (PCST) is introduced, and the design principles for anchor bolts and cables on the roof are established. Furthermore, this innovative support technology is implemented at Xintai Coal Mine, yielding favorable results in field applications.

摘要

薄煤层N00工法的提出,革新了传统的煤矿开采模式、关键技术与装备系统,并取得了成功应用。而新开采模式下的巷道围岩控制技术尚不完善,为实现薄煤层N00 工法巷道顶板结构的安全稳定,考虑其工艺流程和顶板变形特点,将巷道划分为超前硐室、垮落成巷两个阶段。并基于Hoek-Brown非线性岩体强度破坏准则,确定了巷道顶板不同阶段的锚杆/索预紧力的计算公式,提出了巷道顶板锚杆/索预紧力及长度设计方法。此外,结合数值模拟研究了不同阶段巷道顶板锚杆/索支护作用机理及不同锚杆/索支护组合对围岩应力分布的影响,揭示了锚杆/索支护关键参数对顶板稳定性的影响机制。最后,综合理论与数值模拟分析结果,提出了分区补偿支护技术,确定了锚杆/索预紧力、长度及选材的设计原则,该技术在现场取得了良好的应用效果。

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Beijing, 100083, China

    Jun Yang  (杨军), Ben Liu  (刘奔), Ya-jun Wang  (王亚军), Jun Zhang  (张俊), Shi-lin Hou  (侯世林), Xing Wu  (吴星) & Hong-cai Li  (李宏财)

  2. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Ya-jun Wang  (王亚军)

  3. Shenmu Ningtiaota Coal Mining Company Ltd., Shaanxi Coal Mining Group, Yulin, 719300, China

    Yu-kun Wang  (王育坤)

Authors
  1. Jun Yang  (杨军)
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  2. Ben Liu  (刘奔)
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  4. Jun Zhang  (张俊)
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  6. Yu-kun Wang  (王育坤)
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  7. Xing Wu  (吴星)
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  8. Hong-cai Li  (李宏财)
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Contributions

YANG Jun and WANG Ya-jun developed the overarching research goals and led the project; LIU Ben edited the draft of the manuscript; ZHANG Jun and HOU Shi-lin provided the measured data and analyzed the measured data; WU Xing and LI Hong-cai optimized and analyzed the numerical simulation; WANG Yu-kun improved the language and provided valuable suggestions.

Corresponding authors

Correspondence to Ben Liu  (刘奔) or Ya-jun Wang  (王亚军).

Ethics declarations

YANG Jun, LIU Ben, WANG Ya-jun, ZHANG Jun, HOU Shi-lin, WANG Yu-kun, WU Xing and LI Hong-cai declare that they have no conflict of interest.

Additional information

Foundation item: Projects(52074298, 51904207) supported by the National Natural Science Foundation of China; Project(8232056) supported by the Natural Science Foundation of Beijing Municipality, China; Project(2022XDHZ12) supported by the Liulin Energy and Environment Academician Workstation, China; Project([2020]3008J) supported by the Science and Technology Programs in Guizhou Province, China

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Yang, J., Liu, B., Wang, Yj. et al. Roof control mechanism and partition compensation support technology of gob-side entry formed by N00 mining method in thin coal seam. J. Cent. South Univ. 31, 602–620 (2024). https://doi.org/10.1007/s11771-023-5533-z

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  • DOI: https://doi.org/10.1007/s11771-023-5533-z

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