Stability mechanism and control of the pumpable supports in longwall recovery room

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology Pub Date : 2024-07-01 DOI:10.1016/j.ijmst.2024.07.006

Dong Zhang , Jianbiao Bai , Zhijun Tian , Zizheng Zhang , Yonghong Guo , Rui Wang , Ying Xu , Hao Fu , Shuai Yan , Min Deng , Shuaigang Liu

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引用次数: 0

Abstract

The load-bearing performance (LBP) of pumpable supports (PPS) is crucial for the stability of longwall pre-driven recovery room (PRR) surrounding rock. However, the unbalanced bearing coefficient (UBC)of the PPS (undertaking unequal load along the mining direction) has not been investigated. A mechanical model of the PRR was established, considering the main roof cantilever beam structure, to derive an assessment formula for the load, the failure criteria, and the UBC of the PPS. Subsequently, the generation mechanisms, and influencing factors of the UBC were revealed. Global sensitivity analysis shows that the main roof hanging length (l₂) and the spacing between the PPS (r) significantly impact the UBC. A novel design of the PPS and the coupling control technology were proposed and applied to reduce the UBC of the PPS in the adjacent longwall PRR. Monitor results showed no failure of the PPS at the test site, with the UBC (ζ) reduced to 1.1 consistent with the design value (1.15) basically, fully utilizing the collaborative LBP of the PPS. Finally, the maximum roof-to-floor convergence of the PRR was 234 mm, effectively controlling the stability of the surrounding rock of the PRR and ensuring the mining equipment recovery.

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长壁回采室可泵支架的稳定机制与控制

可抽水支架（PPS）的承载性能（LBP）对于长壁预驱动回采室（PRR）围岩的稳定性至关重要。然而，PPS 的不平衡承载系数（UBC）（沿开采方向承担不等荷载）尚未得到研究。考虑到主顶板悬臂梁结构，建立了 PRR 的力学模型，从而得出了 PPS 的荷载评估公式、失效标准和 UBC。随后，揭示了 UBC 的产生机制和影响因素。全局敏感性分析表明，主屋顶悬挂长度（l2）和 PPS 间距（r）对 UBC 有显著影响。提出并应用了新型 PPS 设计和耦合控制技术，以降低相邻长壁 PRR 中 PPS 的 UBC。监测结果表明，试验现场的 PPS 没有发生故障，UBC（ζ）降至 1.1，与设计值（1.15）基本一致，充分发挥了 PPS 的协同 LBP 作用。最后，采场顶板到地面的最大收敛为 234 毫米，有效控制了采场围岩的稳定性，确保了采矿设备的回采。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.