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

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

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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 collabora-tive 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.

Pre-driven recovery roomPumpable supportsUnbalanced bearing coefficientHydraulic fractureStability analysisSurrounding rock control

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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State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China

Key Laboratory of Xinjiang Coal Resources Green Mining,Xinjiang Key Laboratory of Coal-bearing Resources Exploration and Exploitation,Xinjiang Engineering Research Center of Green Intelligent Coal Mining,Xinjiang Institute of Engineering,Urumqi 830023,China

Work Safety Key Laboratory on Prevention and Control of Gas and Roof Disasters for Southern Goal Mines,Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines,Hunan University of Science and Technology,Xiangtan 411201,China

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

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Xinjiang Uygur Autonomous Region Key R&D Project Task Special-Department and Department Linkage ProjectMajor Project of Regional Joint Foundation of ChinaHunan Provincial Natural Science Foundation of ChinaXinjiang Uygur Autonomous Region Tianchi Introduction Plan

2022B01051U21A201072024JJ40212024XGYTCYC03

2024

10.1016/j.ijmst.2024.07.006

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2024.34(7)