摘要
针对煤矿巷道软弱底板注浆锚索锚固孔扩孔参数设计问题,通过理论分析、数值模拟与实验室试验相结合的方法,探讨了扩孔直径、长度、段数及扩孔间距等扩孔参数对底板锚索锚固性能的影响,并最终明确了底板锚索锚固孔最优扩孔参数。试验结果表明:底板扩孔锚索锚固力与扩孔直径、段长均成正相关,随扩孔直径的增大其增长趋势先快后缓,随扩孔段长的增加锚固力近似线性增长;多段扩孔效果优于单段扩孔,但当段数超过3段时扩孔锚索锚固力提升不再显著;底板扩孔锚索锚固力随扩孔间距增加呈现先升后降趋势,在扩孔间距为50 mm时达到峰值;通过正交模拟选取锚固孔最优扩孔参数,并结合拉拔试验验证,最终确定最优扩孔参数为扩孔直径90 mm、段长100 mm、段数2段、扩孔间距50 mm。研究成果可为扩孔锚固技术应用于煤矿巷道底板控制提供参考。
For design of reaming parameters of grouted anchor cables borehole in coal mine roadway of weak floor,the influence of reaming parameters,such as reaming diameter,length,number of segments and spacing,on the anchoring performance was investigated by conducting theoretical analysis,numerical simulation and laboratory tests,and the optimal reaming parameters for floor anchor cables borehole was ultimately determinated.The results show that the anchorage force of floor reamed anchor cables is positively correlated with both reaming diameter and segment length.The growth rate of anchorage force initially accelerates and then gradually slows down with the increase of reaming diameter,while it exhibits an almost linear increase with the segment length.Multi-segment reaming outperforms single-segment reaming,but beyond three segments,the improvement becomes negligible.The anchoring force of floor reamed anchor cables increases first and then decreases with the increase of reaming spacing,achieving the peak at 50 mm in space.By orthogonal simulations and pull-out test validation,the optimal reaming parameters were determined as a reaming diameter of 90 mm,a segment length of 100 mm,two reaming segments,and a spacing of 50 mm.The research results can advance the application of reamed anchorage technology in floor strata control of coal mine roadway.
作者
刘少伟
张润泽
侯建军
姚丙傲
付孟雄
贺德印
LIU Shaowei;ZHANG Runze;HOU Jianjun;YAO Bing'ao;FU Mengxiong;HE Deyin(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454000,China;Xinzheng Coal Electricity Co.,Ltd.,Zhengzhou Coal Industry Group,Xinzheng 451100,China)
出处
《采矿与岩层控制工程学报》
北大核心
2025年第3期33-46,共14页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金资助项目(52074102)
中原科技创新领军人才资助项目(244200510013)
河南省高校科技创新团队支持计划资助项目(23IRTSTHN007)
河南省高等学校重点科研项目计划资助项目(25A440006)。
关键词
底板锚索
黏结失效
锚固性能
扩孔参数
floor anchoring cable
bond failure
anchorage performance
reaming anchorage parameters
