长锚固与卸压协同控制在深部强采动巷道的控制效果研究
Research on control effect of long anchorage and pressure relief synergistic control in deep and strong mining roadway
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摘要: 针对深部强采动巷道围岩变形严重问题，以建新矿4203回风巷为工程背景，采用FLAC3D数值模拟软件模拟了巷道在受掘进扰动及二次回采扰动时分别采用“短锚杆+长锚索”、“长锚杆+短锚索”、“长锚杆+短锚索+卸压”3种方案后巷道的应力分布规律和巷道围岩的变形规律。结果表明：加长锚杆长度可有效降低顶板变形量，卸压可有效改善巷道围岩应力坏境。并在4203回风巷设置了试验段，证明了长锚固和卸压协同控制对巷道变形量的控制和应力环境的改善具有明显效果。Abstract: In view of the serious deformation of surrounding rock of deep strong mining roadway, this paper takes 4203 return airway in Jianxin Mine as the engineering background, and uses FLAC3D numerical simulation software to simulate the stress distribution law of roadway and the deformation law of surrounding rock of roadway after three schemes of “short bolt + long anchor cable”, “long bolt + short anchor cable” and “long bolt + short anchor cable + pressure relief” are adopted when the roadway is disturbed by tunneling and secondary mining. The results show that increasing the bolt length can effectively reduce the roof deformation, and pressure relief can effectively improve the stress environment of roadway surrounding rock. The experimental section was set up in 4203 return airway, which proved that the collaborative control of long anchorage and pressure relief had obvious effect on the control of roadway deformation and the improvement of stress environment.
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