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徐军, 孟宁康, 柏建彪. 切顶沿空留巷充填体-矸石协同承载机理及控制技术研究[J]. 矿业安全与环保.
引用本文: 徐军, 孟宁康, 柏建彪. 切顶沿空留巷充填体-矸石协同承载机理及控制技术研究[J]. 矿业安全与环保.
Xu Jun, Meng Ningkang, Bai Jianbiao. Cooperative load-bearing mechanism of backfill body-gangue by roof cutting and control technology[J]. Mining Safety & Environmental Protection.
Citation: Xu Jun, Meng Ningkang, Bai Jianbiao. Cooperative load-bearing mechanism of backfill body-gangue by roof cutting and control technology[J]. Mining Safety & Environmental Protection.

切顶沿空留巷充填体-矸石协同承载机理及控制技术研究

Cooperative load-bearing mechanism of backfill body-gangue by roof cutting and control technology

  • 摘要: 针对深部沿空留巷顶底板移进量大、充填体大变形破坏失稳等问题,以朱庄煤矿Ⅲ635工作面沿空留巷为工程背景,提出了一种巷旁充填体-矸石组合结构体协同承载的切顶卸压沿空留巷技术;建立了充填体-矸石协同支撑顶板力学模型,推导了顶板挠度方程;运用数值模拟和现场实践相结合的方法,阐析了传统沿空留巷和切顶卸压协同承载沿空留巷围岩应力演化规律和变形特征,揭示了切顶沿空留巷充填体-矸石协同承载机理。结果表明:采用切顶卸压协同承载沿空留巷技术后,实体煤帮和充填体的垂直应力峰值分别降低了28.3%和44.4%,巷道顶底板移近量降低了58.2%。现场应用表明,该技术有效控制了巷道变形,为类似条件下沿空留巷围岩控制提供了参考价值。

     

    Abstract: In response to the problems of large displacement of the roof to floor andlarge deformation failure of the backfill body, with the gob-side entry retaining by roof cutting of working face Ⅲ635of Zhuzhuangcoal mine.This paper proposes a composite load-bearing of the backfill body and gangue during gob-side entry retaining. The theoretical method is used to analysis the mechanical model of the roof considering the combined support of backfill body and gangue, and the deflection equation of the roof is derived. Using a combination of numerical simulation and field practice, the deformation mechanism and stress evolution law of the surrounding rocks was studied, and revealing the synergistic load-bearing effect of the backfill body and gangue during gob-side entry retaining. The results show that:after the adoptionof the composite load-bearing of the backfill body and gangue during gob-side entry retaining, the vertical stress peaks of the solid coal and the backfilling body are reduced by 28.3% and 44.4% respectively. The deformation of the roof to floor of the roadway is reduced by 58.2%. The field application results show that the technology effectively controls the roadway deformation and provides a reference value for the control of the surrounding rock of gob-side entry retaining under similar conditions.

     

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