深部巷道围岩变形破坏特征及控制技术研究

    Deformation failure characteristics and control technology of surrounding rock in deep roadway

    • 摘要: 针对朱仙庄煤矿 Ⅲ3 采区千米上山巷道存在围岩变形量大、破坏严重,进而影响安全生产的问题,在系统分析研究区地质条件、水文地质特征及开拓布置基础上,结合现场调研构建了深部千米巷道围岩开拓的工程地质模型。采用数值模拟方法,分析了初始支护方案下深部上山巷道围岩的变形破坏特征及失稳机理;针对初始支护的不足,提出了增设注浆锚杆、锚索与钢带的二次优化支护方案,并对比分析了2次支护前后围岩的变形破坏差异。研究结果表明:初始支护条件下,巷道顶板最大下沉量达 16.6 cm,最大底鼓量约 12.7 cm,围岩破坏深度最大为 1.5 m;当开拓进尺达到 6~8 m 后,其对初始位置2 m处围岩监测断面的影响显著减弱。基于此,提出了深部巷道围岩二次优化支护控制技术,并通过数值模拟进行了反演验证,结果显示,二次优化支护后的巷道围岩位移、应力分布及锚杆受力状态在大范围内得到明显改善,其中锚杆轴力分布更均匀、最大值显著降低,有效提升了锚杆支护的安全性与可靠性。对比分析2次支护后的现场位移场与应力场量化数据发现,2种支护方式在固定监测断面的监测规律具有良好一致性,但二次优化支护后,巷道围岩位移影响范围明显缩小,两帮压应力显著降低,顶底板未出现拉应力,围岩应力分布更趋于合理。现场调查进一步证实,二次优化支护后的巷道围岩未发生明显变形破坏,表明该方案对深部巷道围岩的控制效果显著。

       

      Abstract: To address the issues of excessive surrounding rock deformation and severe damage in the kilometer-long uphill roadway of panel Ⅲ3 in Zhuxianzhuang Coal Mine, which have adversely affected safe production, we systematically analyzed the geological conditions, hydrogeological characteristics, and development layout of the research area. On this basis, an engineering geological model for deep kilometer-long roadway surrounding rock development was established through field investigations. Using numerical simulation methods, the deformation and failure characteristics as well as the instability mechanism of the surrounding rock of the deep uphill roadway under the initial support scheme were studied. Aiming at the deficiencies of the initial support, a secondary optimized support scheme incorporating grouted anchor bolts, anchor cables, and steel strips was proposed, and the differences in surrounding rock deformation and failure before and after the two support schemes were compared and analyzed. The research results show that under the initial support conditions, the maximum roof subsidence of the roadway reaches 16.6 cm, the maximum floor heave is approximately 12.7 cm, and the maximum depth of surrounding rock failure is 1.5 m; when the excavation advanced reaches 6-8 m, its influence on the surrounding rock monitoring section at the initial position of 2 m is significantly weakened. Based on these findings, a secondary optimized support control technology for deep roadway surrounding rock was proposed. Numerical simulation was adopted for inversion verification, the result shows that after the secondary optimized support, the surrounding rock displacement, stress distribution, and anchor bolt force state are significantly improved over a wide range. Among these improvements, the axial force distribution of the anchor bolts is more uniform, and the maximum value is significantly reduced, which effectively enhances the safety and reliability of the anchor bolt support. A comparison of the quantitative data of the in-situ displacement field and stress field before and after the two support schemes reveals that the monitoring laws of the two support methods at the fixed monitoring section are in good consistency. However, after the secondary optimized support, the influence range of surrounding rock displacement is significantly reduced, the compressive stress on the two sidewalls is remarkably decreased, no tensile stress occurs in the roof and floor, and the surrounding rock stress distribution tends to be more reasonable. Field investigations further confirm that no obvious deformation or failure of the surrounding rock occurs after the secondary optimized support, indicating that this scheme has a significant control effect on the surrounding rock of deep roadways.

       

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