中南大学学报（自然科学版）2025，Vol.56Issue(2)：730-743,14.DOI:10.11817/j.issn.1672-7207.2025.02.026
嵌岩抗浮锚杆承载性能现场试验与机理分析
Field test and mechanism analysis of bearing capacity of rock-socketed anti-floating anchor
摘要
Abstract
Using quasi-distributed strain sensing technology,the strain change of the anti-floating anchor was tested in the ultimate pull test in the field,the internal force distribution characteristics and load transfer rules of anti-floating anchor were analyzed,the influence mechanism of anchoring length on the bearing performance of anti-floating anchor was revealed,and the existence of critical anchorage length was verified.Based on Hoek-Brown criterion,an effective formula for calculating the critical anchorage length of rock-socketed anti-floating anchor was presented.The results show that there are inflection points in the load-displacement curves of the bolt body and the grout body,which are 75％and 60％of the ultimate bearing capacity of the bolt respectively.The displacement changes linearly before the inflection point,and the displacement change rate increases significantly after the inflection point.With the increase of the load level,the load transfer depth of the anti-floating bolt increases gradually,and the axial force of the bolt body decreases slowly,and the axial force mainly concentrates in the shallow rock layer.The shear stress at the rod-slurry interface increases rapidly at first and then decreases rapidly,and the peak shear stress occurs at the anchorage depth of about 0.75 m.The ultimate pulling capacity of the 9 test bolts is about 200 kN,and the critical anchorage length calculated based on the formula is 2.78 m,which is basically consistent with the field test results.The research results could provide reference for the design of rock-socketed anti-floating anchor.关键词
抗浮锚杆/轴力/剪应力/锚固机制/临界锚固长度/现场极限抗拔试验Key words
anti-floating anchor/axial force/shear stress/anchoring mechanism/critical anchorage length/field ultimate pull test分类
建筑与水利引用本文复制引用
闫楠,孙淦,白晓宇,王忠胜,刘一鸿,贾世祥,张亚妹,崔岚..嵌岩抗浮锚杆承载性能现场试验与机理分析[J].中南大学学报（自然科学版）,2025,56(2):730-743,14.基金项目
国家自然科学基金资助项目(52478348) （52478348）
山东省泰山学者项目(tsqn202306234) （tsqn202306234）
青岛市自然科学基金原创探索项目(24-4-4-zrjj-180-jch) （24-4-4-zrjj-180-jch）
山东省自然科学基金青年项目(ZR2023QE107)(Project(52478348)supported by the National Natural Science Foundation of China （ZR2023QE107）
Project(tsqn202306234)supported by Taishan Scholars Program of Shandong Province （tsqn202306234）
Project(24-4-4-zrjj-180-jch)supported by the Qingdao Natural Science Foundation Original Exploration （24-4-4-zrjj-180-jch）
Project(ZR2023QE107)supported by the Youth Project of Shandong Province Natural Science Foundation) （ZR2023QE107）
