窄煤柱沿空巷道围岩变形破坏特征及控制技术优化

Deformation and Failure Characteristics of Surrounding Rock in Narrow Coal Pillar Roadway Along Goaf and Optimization of Control Technology

  • 摘要: 针对窄煤柱沿空巷道不同的围岩破坏变形问题,以任楼煤矿Ⅱ7226S工作面为研究对象,通过分析围岩变形破坏影响因素,结合现场条件提出窄煤柱沿空巷道围岩控制技术优化方案。研究结果表明,工作面地质条件差、巷道护表强度降低、注浆效果差是巷道变形的主要因素。基于调研结果,对巷道支护方案和注浆工艺进行针对性优化,并进行工业实践。现场监测结果表明,优化方案施工后,巷道顶底板相对移近量和两帮收敛量最大值分别为104 mm和110 mm,围岩变形得到有效控制,巷道稳定性显著提升。

     

    Abstract: Aiming at the different problems of surrounding rock failure and deformation in narrow coal pillar roadway along goaf, taking the II7226S working face of Renlou Coal Mine as the research object, by analyzing the influencing factors of surrounding rock deformation and failure, combined with the on-site condition, an optimization scheme for surrounding rock control technology in narrow coal pillar roadway along goaf is proposed. The research results show that the poor geological conditions at the working face, the decrease of roadway surface protection strength, and the poor grouting effect are the main factors causing roadway deformation. Based on the investigation and survey results, targeted optimizations are counducted on the roadway support scheme and grouting process, followed by industrial practice. The on-site monitoring results show that, after the construction of the optimization scheme, the maximum relative displacement value of the roadway roof and floor and the maximum convergence quantity of the two sides are 104 mm and 110 mm, respectively, the surrounding rock deformation is effectively controlled, and the roadway stability is significantly improved.

     

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