[1]罗熹,王曌丞,唐小明,等.钢筋笼扩大头锚杆扩体段承载性能低周循环拉拔试验[J].长安大学学报(自然科学版),2025,45(5):105-116.[doi:10.19721/j.cnki.1671-8879.2025.05.009]
　LUO Xi,WANG Zhao-cheng,TANG Xiao-ming,et al.Low-cycle pullout test on bearing performance of expansion section for underreamed anchor with reinforcement cage[J].Journal of Chang’an University (Natural Science Edition),2025,45(5):105-116.[doi:10.19721/j.cnki.1671-8879.2025.05.009]
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钢筋笼扩大头锚杆扩体段承载性能低周循环拉拔试验()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年5期
页码:
105-116
栏目:
桥梁与隧道工程
出版日期:
2025-09-30

文章信息/Info

Title:
Low-cycle pullout test on bearing performance of expansion section for underreamed anchor with reinforcement cage
文章编号:
1671-8879(2025)05-0105-12
作者:
罗熹1; 王曌丞2; 唐小明3; 柳鸿博4; 许晨浒5; 缪国军6; 戴国亮5
(1. 长安大学 公路学院,陕西 西安 710064; 2. 中国一冶集团有限公司,湖北 武汉 430081; 3. 柳州市城市投资建设发展有限公司,广西 柳州 545000; 4. 兰州理工大学 土木与水利工程学院,甘肃 兰州 730050; 5. 东南大学 土木工程学院,江苏 南京 211189; 6. 南京东大自平衡桩基检测有限公司,江苏 南京 211164)
Author(s):
LUO Xi1;  WANG Zhao-cheng2;  TANG Xiao-ming3;  LIU Hong-bo4;  XU Chen-hu5; MIAO Guo-jun6;  DAI Guo-liang5
关键词:
路基工程;  扩大头锚杆;  钢筋笼;  循环加载;  承载力;  拉拔试验
Keywords:
Key words:subgrade engineering;  underreamed anchor;  reinforcement cage;  cyclic loading;  bearing capacity;  pullout test
分类号:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.05.009
文献标志码:
A
摘要:
针对扩大头锚杆在复杂地质条件下的承载性能提升需求,采用在扩体段嵌入变直径钢筋笼的技术方案,通过室内低周循环拉拔试验深入探究了钢筋笼对扩体段承载性能、破坏模式及荷载传递机制的影响; 选取2根变直径钢筋笼扩大头锚杆和2根普通无钢筋笼扩大头锚杆,在统一参数标准下进行了分级循环加载,利用应变片监测了注浆体表面及主筋的应力分布,并对比分析了其荷载-位移曲线及破坏形态。研究结果表明:嵌入钢筋笼可显著提升扩大头锚杆的综合性能,钢筋笼扩大头锚杆极限承载力较普通扩大头锚杆提高约62.5%,极限位移增加约1.68倍,且普通扩大头锚杆表现为脆性劈裂破坏,而钢筋笼扩大头锚杆则表现为塑性破坏; 钢筋笼通过优化荷载传递显著增强了扩体段整体性,在扩体段后半段,钢筋笼扩大头锚杆注浆体表面应力为普通扩大头锚杆的3.2～4.9倍,扩体段嵌入钢筋笼后,主筋应力衰减速率降低,荷载传递效率提高,主筋在扩体段大部分深度内应力更稳定,且在承压板附近形成了有效应力传递,显著提高了扩体段后半段可承受的最大应力; 钢筋笼增加了主筋杆体与注浆体的接触面积,提升了侧摩阻力,有效分散了应力,延缓了应力集中引发的破坏,使扩大头锚杆在循环荷载下的累积塑性变形可控。综上所述,研究结果从承载性能、破坏机理和内力分布的角度,为理解并应用钢筋笼扩大头锚杆提供了依据。
Abstract:
To address the need for improving the bearing performance of underreamedanchor in complex geological conditions, the technical solution of embedding anexpandable reinforcement cage within the expansion section was adopted. Through theindoor low-cycle pullout tests, the influence of reinforcement cage on the bearingperformance, failure mode, and load transfer mechanism of the expansion section wasthoroughly investigated. Two underreamed anchors with expandable reinforcementcages and two conventional underreamed anchors without reinforcement cages wereselected and subjected to graded cyclic loading under uniform parameter standards.Strain gauges were used to monitor the stress distributions on grout body surface andmain bars, and their load-displacement curves and failure modes were comparativelyanalyzed. The research results indicate that embedding the reinforcement cage cansignificantly enhance the overall performance of underreamed anchors. Compared to conventional underreamed anchors, theultimate bearing capacity of underreamed anchors with reinforcement cages increasesby approximately 62.5%, and the ultimate displacement increases by about1.68times. The conventional underreamedanchors exhibit brittle splitting failure, whereas the underreamed anchors withreinforcement cages display ductile failure. The reinforcement cage significantlyenhances the integrity of the expansion section by optimizing load transfer. Within therear half of the expansion section, the stresses on the grout body surfaces of underreamedanchors with reinforcement cages are 3.2-4.9 times of those of conventionalunderreamed anchors. After embedding the reinforcement cage within the expansionsection, the stress attenuation rate in the main bar decreases and the load transferefficiency improve. The stress in the main bar remains more stable throughout most ofthe expansion section depth. Effective stress transfer is established near the bearingplate, significantly increasing the maximum stress withstand by the rear half of theexpansion section. The reinforcement cage increases the contact area between the mainbar and the grout body, improves the side friction resistance, effectively dispersesstress, delays the failure caused by the stress concentration, and enables the cumulativeplastic deformation of the underreamed anchors to be controllable under cyclicloading. In summary, the research results provide a basis for understanding andapplying underreamed anchor with reinforcement cage from perspectives of bearingperformance, failure mechanism, and internal force distribution.3 tabs, 9 figs, 34 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-03-04
基金项目:国家自然科学基金项目(52378328)
作者简介:罗 熹(1982-),男,广西柳州人,高级工程师,工学博士,E-mail:21027445@qq.com。
更新日期/Last Update: 2025-09-30