深部厚煤层采动应力场特征及控制技术研究

Characteristics and control technology of mining stress field in deep thick coal seams

  • 摘要: 随着煤矿开采进入深部,明确深部厚煤层开采过程中采动应力场时空演化特征,实现采动影响下采场围岩破坏程度的精准把控,能够有效控制回采巷道围岩变形失稳。为此,以某矿为工程背景,采用理论分析、数值模拟以及现场实测等方法,分析支架工作阻力,得到工作面回采期间,中部端头受采动影响,采动应力最大。结合现场实践提出的“顶板水压致裂+实体煤侧大直径钻孔卸压+煤柱侧注浆加固”多维耦合控制技术方案。根据现场观测结果,采场围岩应力峰值降低了63.80%~84.56%,回采巷道帮部大变形等矿压显现现象明显减轻。围岩协同控制技术有效保障了采场围岩体整体稳定性,降低了该区域灾害风险,保障了工作面安全开采,同时也为其他同类型深部工作面的采动影响控制提供案例参考和技术支持。

     

    Abstract: With the coal mining entering the deep, the deformation and instability of the surrounding rock of the mining roadway can be effectively controlled by clarifying the spatiotemporal evolution characteristics of the mining stress field in the deep thick coal seam mining process and realizing the accurate control of the damage degree of the surrounding rock of the stope under the influence of mining.Therefore, taking a mine as the engineering background, theoretical analysis, numerical simulation and field measurement are used to analyze the working resistance of the support, and it is concluded that during the mining period of the working face, the central end is affected by mining, and the mining stress is the largest.Combined with the field practice, the multi-dimensional coupling control technology scheme of “roof hydraulic fracturing+large diameter drilling pressure relief on solid coal side+grouting reinforcement on coal pillar side” is put forward.According to the field observation results, the peak stress of surrounding rock in stope decreased by 63.80%~84.56%,and the phenomena of strata behavior such as large deformation of mining roadway side were obviously alleviated.The surrounding rock collaborative control technology effectively ensures the overall stability of the surrounding rock in the stope, reduces the disaster risk in this area, and ensures the safe mining of the working face.

     

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