动压影响孤岛工作面巷道围岩“卸-支平衡”协同控制技术

    Research on collaborative control technology of “unloading and support balance” for surrounding rock of isolated roadway under the influence of dynamic pressure

    • 摘要: 煤矿深部工作面回采过程中,经常受到强开采动压作用影响,矿压显现强烈,巷道围岩变形破坏程度大,尤其对于孤岛工作面,动压影响更加显著,围岩控制难度成倍增加。为了解决深部孤岛工作面强动压影响回采巷道围岩控制问题,以2308工作面为研究背景,采用理论分析、数值模拟、现场验证等方法,首先对巷道围岩结构模型进行分析,确定影响工作面围岩稳定的主要因素;进一步对煤柱宽度和钻孔卸压2种方案进行研究,并根据巷道围岩的实际变形情况,确定巷道围岩的非对称支护参数,实现受强动压影响回采巷道的“卸-支平衡”协同控制方案。经过现场实践验证,2308工作面巷道顶底板移近量为260 mm,两帮移近量为471 mm,巷道围岩的整体性得到增强,变形得到有效控制;采用“卸-支平衡”方案对受动压影响巷道围岩的控制效果显著。

       

      Abstract: During the mining process of deep coal mining faces, they are often affected by strong mining dynamic pressure, resulting in strong mining pressure and significant deformation and damage of the surrounding rock of the roadway. Especially for isolated working faces, the dynamic pressure effect is more significant, and the difficulty of controlling the surrounding rock increases exponentially. In order to solve the problem of the influence of strong dynamic pressure on the control of surrounding rock in mining tunnels in deep isolated working faces, this paper takes 2308 working face as the research background and uses methods such as theoretical analysis, numerical simulation, and on-site verification. Firstly, the structural model of the surrounding rock in the tunnel is analyzed to determine the main factors affecting the stability of the surrounding rock in the working face. Further research will be conducted on the two options of coal pillar width and drilling pressure relief, and based on the actual deformation of the tunnel surrounding rock, the asymmetric support parameters of the tunnel surrounding rock will be determined to achieve a “unloading and support balance” collaborative control plan for the mining tunnel affected by strong dynamic pressure. After on-site practice verification, the displacement of the roof and floor of the 2308 working face roadway is 260 mm, and the displacement of the two sides is 471 mm. The integrity of the surrounding rock of the roadway is enhanced, and deformation is effectively controlled. The use of “unloading and support balance” has a significant control effect on the surrounding rock of tunnels affected by dynamic pressure.

       

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