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以贺西煤矿3311工作面沿空留巷为背景,采用FLAC~(3D)有限差分程序计算分析了不同工作面回采阶段沿空留巷围岩、充填墙体及煤柱中的应力、变形分布特征,提出了沿空留巷合理的支护对策。研究结果表明:沿空留巷直接顶内的垂直应力和水平应力变化剧烈程度明显大于基本顶;围岩及充填墙体受力变化受3311工作面回采滞后采动应力作用明显,且主要对垂直应力的变化产生影响;3313工作面二次采动阶段,巷道围岩的变形受采动影响的敏感性远大于受力,即在充填墙体和巷道围岩应力增加很小的情况下,巷道变形增幅却相对较大,且主要表现为底鼓和两帮移近。井下试验表明,采用锚杆锚索与充填墙体联合支护后,通过优化现场施工工艺,沿空留巷满足了回采工作面的通风需求,降低了巷道掘进成本,实现了回采工作面快速推进。
Taking the gob-side entry retaining in No.311 working face of Hexi Coal Mine as a background, the stress and deformation distribution in surrounding rock, filling wall and coal pillar of gob-side entry retaining gob-side entry in different working face are analyzed by FLAC 3D finite difference program Characteristics, proposing a reasonable support measures for gob-side entry retaining. The results show that the variation of vertical stress and horizontal stress in the direct roof of gob-side entry retaining is obviously greater than that of the basic roof. The stress change of the surrounding rock and filling wall is obviously affected by the backward mining of the 3311 working face, The influence of mining on the deformation of roadway surrounding rock is much greater than the stress, that is to say, under the condition of small increase of wall rock stress and surrounding rock mass in roadway, Deformation growth is relatively large, and the main performance for the bottom drum and two closer. The downhole test shows that after the joint support of the anchor cable and the filling wall, the gob-side entry can meet the ventilation requirements of the mining face by optimizing the on-site construction technology, reducing the tunneling cost and realizing the rapid advancing of the mining face .