快速掘进煤巷围岩稳定性控制

Surrounding rock stability control of rapid excavation coal roadway

  • 摘要:
    目的 针对高地压、高地温及强冲击倾向性煤层条件下煤巷快速掘进围岩稳定性控制难题,
    方法 以陕西正通煤矿3409运输顺槽为工程背景,通过理论计算与FLAC3D数值模拟,研究巷道围岩塑性区分布规律及应力演化特征。
    结果及结论 研究结果表明,理论计算得出两帮塑性区宽度为2.78 m,数值模拟显示两帮塑性区宽度为2.5 m,顶底板塑性区宽度为4.5 m,顶板垂直应力呈蝶形分布且底板底角存在应力侵蚀现象。基于此,优化锚杆锚索支护参数(顶锚杆间排距由1000 mm×1100 mm调整为950 mm×1200 mm,顶锚索间排距由1200 mm×1200 mm调整为1500 mm×1100 mm),并开展现场工业试验。监测结果表明,优化后两帮最大移近量由146 mm降至43.2 mm,顶底板最大移近量由282.5 mm降至76.2 mm,围岩变形控制效果显著。

     

    Abstract: In response to the difficult problem of the stability control of the surrounding rock during the rapid excavation of coal roadways under the conditions of high ground pressure, high ground temperature, and strong impact-prone coal seams, taking the 3409 transportation crossheading of Shaanxi Zhengtong Coal Mine as the engineering background, through theoretical calculations and FLAC3D numerical simulations, the distribution law of the plastic zone of the roadway surrounding rock and the characteristics of stress evolution were studied. The research results show that: the width of the plastic zone on both sides calculated theoretically is 2.78 m, and the numerical simulation shows that the width of the plastic zone on both sides is 2.5 m, and the width of the plastic zone of the roof and floor is 4.5 m. The vertical stress of the roof is distributed in a butterfly shape, and there is a stress erosion phenomenon at the bottom corner of the floor. Based on this, the support parameters of bolts and cables were optimized (the row spacing of roof bolts was adjusted from 1000 mm×1100 mm to 950 mm×1200 mm, and the row spacing of roof cables was adjusted from 1200 mm×1200 mm to 1500 mm×1100 mm), and on-site industrial tests were carried out. The monitoring results show that after optimization, the maximum separation amount of both sides decreased from 146 mm to 43.2 mm, and the maximum separation amount of the roof and floor decreased from 282.5 mm to 76.2 mm. The control effect on the deformation of the surrounding rock is remarkable.

     

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