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Key technology of gob-side entry retained by roof cutting without coal pillar for hard main roof: A typical case study

坚硬基本顶切顶沿空留巷关键技术: 典型案例研究

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Abstract

This study results from the authors’ long-term efforts to develop key technology of gob-side entry retained by roof cutting under hard main roof. Three directions energy-gathered pre-splitting blasting device (TDEGPBD), open gob sealed technology with the flame retardant cement blanket (FRCB), and entry support with following mining states control ideology (FMSC) were proposed. The mechanical model of energy-gathered pre-splitting blasting with TDEGPBD was established. TDEGPBD can fracture rock mass in three directions and reduce roof suspension. Aiming at preventing spontaneous combustion of reserved coal in the gob, open gob sealed technology with FRCB was invented. It not only considers the space-time of gangue collapse but also realizes the goals of open gob rapid seal. Monitoring results show that CO, O2, and CH4 concentration decreased significantly to 0, 3.0257%, and 0.0899%, respectively. Following mining states control scheme considering the stages and the regions was proposed. The convergences of the roof near the cutting side and near the virgin coal side were 115 mm and 104 mm, respectively and the convergence between the gangue rib and virgin coal rib was 88.7 mm. These three key technologies provide an innovative approach and have significant application potential in non-coal pillar mining method.

摘要

坚硬基本顶切顶沿空留巷产生的采空区悬顶、遗煤自燃发火和巷道围岩破坏是影响无煤柱开采 安全高效的难题。为解决上述难题,本文提出了三向聚能预裂爆破装置、阻燃水泥毯采空区封堵技术 和巷道围岩随态控制策略。建立了三向聚能预裂爆破的力学模型,三向聚能预裂爆破装置可促使岩体 沿三个方向产生裂纹,减少悬顶产生。为防止采空区遗煤自燃,发明了阻燃水泥毯采空区封堵技术。 该技术不仅考虑了切顶预裂爆破过程中矸石垮落的时空特征,而且实现了采空区快速密闭。监测结果 表明采空区内一氧化碳、氧气和瓦斯浓度分别显著下降至0、3.0257%和0.0899%。根据切顶巷道围岩 破坏时空特征,提出了考虑分阶段和分区域的随态控制策略,靠近切顶帮和实体煤帮的顶底移近量分 别为115 mm和104 mm,两帮移近量为88.7 mm,巷道破坏得到有效控制。三项关键技术为坚硬基本 顶切顶沿空留巷实践提供了有益借鉴。

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Authors and Affiliations

  1. School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Heng-zhong Zhu  (朱恒忠)

  2. State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China

    Heng-zhong Zhu  (朱恒忠)

  3. School of Mining, Guizhou University, Guiyang, 550025, China

    Zhi-jie Wen  (文志杰)

  4. School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, China

    Lei Xu  (许磊)

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

    Fu-lian He  (何富连)

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  1. Heng-zhong Zhu  (朱恒忠)
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Contributions

ZHU Heng-zhong provided the concept, edited and revised the manuscript, preformed data analysis, on-site monitoring. WEN Zhi-jie and HE Fu-lian gave guidance. ZHU Heng-zhong and XU Lei conducted the literature review and field investigation.

Corresponding author

Correspondence to Heng-zhong Zhu  (朱恒忠).

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ZHU Heng-zhong, WEN Zhi-jie, XU Lei and HE Fu-lian declare that they have no conflict of interest.

Additional information

Foundation item: Project(51974317) supported by the National Natural Science Foundation of China

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Zhu, Hz., Wen, Zj., Xu, L. et al. Key technology of gob-side entry retained by roof cutting without coal pillar for hard main roof: A typical case study. J. Cent. South Univ. 30, 4097–4121 (2023). https://doi.org/10.1007/s11771-023-5523-1

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