深部高应力巷道围岩支护技术研究与实践

    Research and practice of perimeter rock support technology for deep high-stress roadway

    • 摘要: 针对佛洼煤矿8320工作面运输巷围岩松动圈范围较大的问题,分析了巷道围岩变形破坏原因,提出了“锚杆+锚索+金属网+反底拱+混凝土”联合支护方案。采用FLAC3D数值模拟软件,模拟了原支护方案和优化支护方案下巷道围岩垂直应力和水平应力分布情况,验证了该方案有效,并成功应用于现场实践。研究结果表明:巷道围岩初期变形速率较大,55 d后逐渐趋于稳定。监测期间顶板最大下沉量、两帮最大收敛量、最大底鼓量分别为59.1、48.1、66.7 mm;顶板下沉速率降到0.02 mm∙d−1,两帮收敛速率降到0.02 mm∙d−1,底板鼓起速率降到0.01 mm∙d−1,支护方案对巷道围岩稳定的控制效果显著。

       

      Abstract: Aiming at the problem of a large range of loosening circle of the surrounding rock in the transport roadway of 8320 working face in Fowu Mine, the causes of deformation and damage of the surrounding rock in the roadway were analysed, and the joint support scheme of "anchor rod + anchor cable + metal mesh + anti-bottom arch + concrete" was put forward. FLAC3D numerical simulation software was used to simulate the distribution of vertical and horizontal stresses in the peripheral rock under the original and optimised support schemes, which verified the effectiveness of the scheme and was successfully applied in field practice. The results show that the deformation rate of the peripheral rock of the roadway is large at the beginning, and gradually tends to be stable after 55 d. During the monitoring period, the maximum subsidence of the top plate, the maximum convergence of the two gangs, and the maximum bottom bulge were 59.1 mm, 48.1 mm, and 66.7 mm, respectively; the subsidence rate of the top plate was reduced to 0.02 mm∙d−1, the convergence rate of the two gangs to 0.02 mm∙d−1, and the rate of the bottom bulge was reduced to 0.01 mm∙d−1. The effect of this support scheme in the control of the stability of the peripheral rock of the roadway was remarkable.

       

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