抗浮锚杆极限荷载现场试验及抗拔承载力预测
Field test on the ultimate load of anti-floating anchor and the prediction of its pull-out bearing capacity
苏杭 1孙淦 1陈建强 1白晓宇 1包希吉 2孙培富3
作者信息
- 1. 青岛理工大学 土木工程学院,青岛 266525
- 2. 中建八局第二建设有限公司,济南 250014
- 3. 青岛中建联合集团有限公司,青岛 266100
- 折叠
摘要
基于青岛某工程抗浮锚杆的极限承载力现场拉拔试验,对抗浮锚杆荷载-位移规律进行分析,明确"一锚多筋"型抗浮锚杆破坏形式、破坏机理,同时,采用三次多项式函数预测极限上拔位移下抗浮锚杆的抗拔承载力.研究表明:锚杆的荷载-位移曲线呈"缓变-陡升"型;锚-岩界面黏结强度较小,抗浮锚杆主要产生锚固体拔出破坏;规范公式预测值存在较大偏差.通过三次多项式函数的回归分析,杆体位移的误差控制在 10%以内,且锚杆杆体位移小于 20 mm时,预测精度最高可达 97.4%.研究结果对该地层抗浮锚杆的设计与工程应用具有一定的参考价值.
Abstract
Based on the field pull-out test on the ultimate bearing capacity of anti-floating an-chor of a project in Qingdao,the load-displacement law of anti-floating anchor was analyzed,and the failure form and mechanism of anti-floating anchor of"one anchor and multi-reinforcement"type were defined.At the same time,cubic polynomial function was used to predict the uplift bearing capacity of anti-floating anchor under ultimate uplift displacement.The research showed that the load-displacement curve of anchor presents a"slow change-steep rise"pattern,the interfacial bond strength between anchor and rock was small,and the anti-floating anchor mainly produced pull-out failure of anchor solids.There were large deviations from the predicted values of the standard formulas.Through regression analysis of cubic polynomial function,the error of anchor displacement was controlled within 10%,and when the anchor position displacement was less than 20 mm,the forecast accuracy could reach 97.4%.The research results have a certain reference value for the design and engineer-ing application of the anti-floating anchor in this formation.
关键词
抗浮锚杆/现场拉拔试验/荷载-位移模型/承载力预测Key words
anti-floating anchor/field pull-out test/load-displacement model/prediction of bearing capacity引用本文复制引用
基金项目
山东省自然科学基金重点项目(ZR2020KE009)
出版年
2024
NETL
NSTL
维普
万方数据