深部综采工作面动压巷道“卸−支”协同控制技术应用

    Application of double-effect surrounding rock control technology of "unloading-supporting" in dynamic pressure roadway of fully mechanized mining face

    • 摘要: 针对深部孤岛工作面动压巷道在强采动下围岩大变形与控制难题,以腾晖矿2206工作面为工程背景,综合运用理论分析、数值模拟及现场监测方法开展系统性研究。首先,剖析巷道围岩结构模型,明确影响围岩稳定的关键因素;其次,通过对比分析煤柱合理宽度与钻孔卸压效果,结合巷道非对称变形特征,确定相应的非对称支护参数,提出了“卸−支”协同控制方案。工程应用表明:采用该方案后,巷道顶底板移近量约为260 mm,两帮移近量约为471 mm,围岩完整性与稳定性显著改善。结果证明,“卸-支”协同控制方案可有效保障深部强动压巷道的围岩稳定。

       

      Abstract: Aiming at the problem of large deformation and control of surrounding rock of dynamic pressure roadway in deep island working face under strong mining disturbance, taking the 2206 working face of Tenghui Mine as the engineering background, systematic research is carried out by comprehensively applying theoretical analysis, numerical simulation and field monitoring methods. Firstly, the structural model of roadway surrounding rock is analyzed, and the key factors affecting the stability of surrounding rock are clearly defined. Secondly, by comparing and analyzing the reasonable width of coal pillar and the pressure relief effect of drilling, combined with the asymmetric deformation characteristics of roadway, the corresponding asymmetric support parameters are determined, and the "unloading-supporting" cooperative control scheme is put forward. The engineering application shows that after adopting this scheme, the convergence of roof and floor is about 260 mm, and the rib-to-rib convergence is about 471 mm, which significantly improves the integrity and stability of surrounding rock. The results show that the "unloading-supporting" cooperative control scheme can effectively ensure the stability of surrounding rock in deep strong dynamic pressure roadway.

       

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