锚索偏心树脂锚固特征分析及锚固剂推送限位装置设计

doi:10.13722/j.cnki.jrme.2022.0341

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摘要锚索锚固偏心现象普遍存在于岩土及地下支护工程中，对锚固系统工作性能存在一定的不利影响。采用理论分析和室内实验手段，初步探究锚固偏心问题的影响机制，明晰了偏心对锚索锚固性能的影响特征，基于自主研发锚固剂推送限位装置，对锚索锚固偏心问题的控制对策进行有效探索。研究结果表明：锚索树脂锚固偏心导致锚固剂–围岩界面处的剪应力及位移分布不均衡，锚索靠近侧锚固剂–围岩界面区域因达到剪应力及位移承载极限而容易发生破坏失效，削弱锚索锚固系统的承载性能；锚固偏心程度与锚索锚固试件的抗拉拔性能整体表现为负相关形式，锚固偏心严重时影响更为显著；锚固剂推送限位装置能够为锚固剂搅拌阶段的锚索提供有效的约束，使锚索能始终近似位于锚固孔中心区域，保证锚索锚固后具有良好的居中效果，装置的实际工作效果得到了室内实验的有效验证。研究成果增加了对锚索偏心锚固问题影响机制的认识，并对该问题的解决途径开展了创新性的尝试研究，有助于进一步保证和提升锚索的树脂锚固效果。

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	贺德印1
	刘少伟1
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	贾后省1
	付孟雄1
	贾连鑫3
	张英4

关键词 ：岩石力学, 锚索树脂锚固, 锚索工作性能, 锚索锚固偏心, 锚固系统, 拉拔测试

Abstract：The anchoring eccentricity of cable bolts is a common in geotechnical and underground support engineering，which has a certain adverse effect on the working performance of the anchoring system. Through theoretical analysis and laboratory experiments，the influence mechanism of the anchoring eccentricity problem was preliminarily explored，and the influence characteristics of the eccentricity on the anchorage performance of the cable bolt were clarified. Based on the self-developed pushing and limiting device of resin cartridges，the control method of the anchoring eccentricity problem of the cable bolt was effectively explored. The results show that the shear stress and displacement distribution at the interface of resin-surrounding rock are unbalanced when the cable bolt is anchored eccentrically. It is easy to cause the failure of the resin-surrounding rock interface area on the near side of the cable bolt because the shear stress and displacement bearing limit are reached，thereby weakening the bearing performance of the cable bolt anchoring system. The anchoring eccentricity degree is negatively correlated with the pull-out resistance of the cable bolt anchored specimen as a whole，and the anchoring eccentricity will have a more significant impact when it is severe. The pushing and limiting device of resin cartridges can provide effective restraint for the cable bolt during the stirring stage of the resin，so that the cable bolt can be kept approximately in the central area of the borehole，thereby ensuring that the cable bolt has a good centering effect after anchoring. The actual working effect of the device has been effectively verified by laboratory experiments. The research increases the understanding of the influence mechanism of the anchoring eccentricity problem of the cable bolt，and conducts innovative attempts to solve the problem，which is helpful to further ensure and improve the resin anchoring effect of the cable bolt.

Key words： geotechnical engineering cable bolt resin anchoring the working performance of cable bolt anchoring eccentricity of cable bolt anchoring system pull-out test

引用本文:

贺德印1，刘少伟1，2，贾后省1，付孟雄1，贾连鑫3，张英4. 锚索偏心树脂锚固特征分析及锚固剂推送限位装置设计[J]. 岩石力学与工程学报, 2023, 42(3): 708-723.
HE Deyin1，LIU Shaowei1，2，JIA Housheng1，FU Mengxiong1，JIA Lianxin3，ZHANG Ying4. Analysis of eccentric resin anchoring characteristics for cable bolts and the design of pushing and limiting device for resin cartridges. , 2023, 42(3): 708-723.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0341 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I3/708

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