Research on the Technology of Long-span and Open-cut Hole Support in Secondary Excavation
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摘要: 针对煤矿开采深度增加，开切眼跨度增大、地质条件复杂多变、围岩支护日益困难的问题，利用FLAC3D数值模拟软件，对南阳坡煤矿8702综采工作面大跨度开切眼支护进行了研究，分析了该开切眼在二次开挖过程中的围岩应力、位移变化规律。研究结果表明：开切眼的位移量大于刷扩开切眼位移量的50%，开切眼左帮位移量大于开切眼右帮及刷扩开切眼右帮的位移量，开切眼左帮顶部位移量大于开切眼右帮顶部位移量。开切眼的破坏形式为顶板拉裂破坏，刷扩开切眼的破坏形式为帮部挤压破坏。依据悬吊理论及其他矿区成功经验，确定了锚网索联合支护方案。通过对现场监测结果分析，表明巷道围岩的变形量与支护条件下数值模拟的变形量基本吻合，该支护方案能有效控制围岩变形，保证开切眼的稳定。Abstract: In view of the problems such as the increase of coal mining depth, the increase of open-cut hole, the complex and changeable geological conditions, and the increasingly difficulty in surrounding rock support, by using FLAC3D numerical simulation software, the long-span and open-cut hole support in 8702 fully mechanized working face in Nanyangpo Coal Mine was studied, the variation law of surrounding rock stress and displacement of the open-cut hole during the secondary excavation were analyzed. The results show that the displacement of the open-cut hole is 50% greater than the displacement of the brush-enlarged open hole, the displacement of the left side of the open-cut hole is larger than that of the right side and the right side of the brush-enlarged open hole, the displacement of the left side of the open-cut hole is greater than that of the right side. The failure mode of open-cut hole is roof tension crack, and the failure mode of brush-expanded open hole is extrusion failure of side. Based on the theory of suspension and the successful experience of other mining areas, the scheme of bolt-mesh-cable combined support is determined. Through the analysis of the monitoring results, it can be seen that the deformation of surrounding rock basically coincides with the deformation of numerical simulation under the supporting conditions. The supporting scheme can effectively control the deformation of surrounding rock and ensure the stability of the open-cut hole.
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