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针对软弱围岩大断面切眼的变形特征,分析了围岩破坏机理,以群锚和高预应力为锚固机制,提出了高强锚杆+锚索+组合构件的支护方案,采用FLAC3D分析了未支护和支护时巷道的塑性区范围和变形量。结果表明支护后巷道围岩塑性区和变形量明显减小,现场检测表明,该支护方案有效地控制了围岩变形,同时验证了方案的可行性。
In view of the deformation characteristics of the large-section cut-off of weak surrounding rock, the failure mechanism of surrounding rock is analyzed. With the anchorage mechanism of group anchorage and high prestressing force, the supporting scheme of high-strength anchor + anchor + combined component is proposed. FLAC3D The range and deformation of plastic zone of roadway when unsupported and supported. The results show that the plastic zone and the deformation of the surrounding rock of the roadway are obviously reduced. The field tests show that the support scheme can effectively control the deformation of surrounding rock and verify the feasibility of the scheme.