Analysis of eccentric resin anchoring characteristics for cable bolts and the design of pushing and limiting device for resin cartridges
HE Deyin1，LIU Shaowei1，2，JIA Housheng1，FU Mengxiong1，JIA Lianxin3，ZHANG Ying4
(1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454003，China；
2. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo，Henan 454003，China；
3. China Energy Shendong Co.，Ltd. Corporation，Shenmu，Shaanxi 719315，China；4. Zhongyun International Engineering Co.，Ltd.，Zhengzhou，Henan 450000，China)
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.
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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2023, Vol. 42 
