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.

中文翻译：

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长壁回收室泵送支架稳定机制与控制


可泵送支架（PPS）的承载性能（LBP）对于长壁预驱动回收室（PRR）围岩的稳定性至关重要。然而，PPS（沿采矿方向承受不等载荷）的不平衡承载系数（UBC）尚未进行研究。考虑主屋顶悬臂梁结构，建立了 PRR 的力学模型，推导出 PPS 的荷载、失效准则和 UBC 的评估公式。随后揭示了UBC的生成机制和影响因素。全局敏感性分析表明，主屋顶悬挂长度（l2）和PPS之间的间距（r）显着影响UBC。提出并应用了一种新颖的 PPS 设计和耦合控制技术，以减少相邻长壁 PRR 中 PPS 的 UBC。监测结果显示，试验现场PPS未出现故障，UBC（ζ）降至1.1，与设计值（1.15）基本一致，充分利用了PPS的协同LBP。最终，PRR顶板最大收敛量为234 mm，有效控制了PRR围岩的稳定性，保证了采矿设备的恢复。