东南大学学报（自然科学版）2025，Vol.55Issue(6)：1549-1563,15.DOI:10.3969/j.issn.1001-0505.2025.06.007
变直径钢筋笼扩大头锚杆扩体段结构力学性能试验研究
Experimental study on structural mechanical performance of the expanded section of underreamed anchor equipped with expandable reinforcement cage
摘要
Abstract
Due to the expandable reinforcement cage embedded in the expanded section,the underreamed an-chor equipped with expandable reinforcement cage has a more significant anti-tensile load advantage compared with the ordinary underreamed anchor.This kind of anchor has a good application prospect in photovoltaic cable-stayed foundation,anti-floating engineering and slope support engineering.However,there are few studies on its anchoring mechanism at present.The failure modes,bearing characteristics and anchoring mechanism of the ordinary underreamed anchor,the compression type and bond type underreamed anchor equipped with expandable reinforcement cage are compared and analyzed through the low cycle pulling tests.The results show that under cyclic load,the failure mode of the ordinary underreamed anchor is brittle failure.On the other hand,the underreamed anchor equipped with expandable reinforcement cage tends to plastic fail-ure.In terms of ultimate bearing capacity,the average increase of the compression type underreamed anchor equipped with expandable reinforcement cage is 62.5%,and that of the bond type underreamed anchor equipped with expandable reinforcement cage is 150%.The ultimate displacement of underreamed anchors equipped with two types of expandable reinforcement cages is both increased by approximately 300%at most.The embedment of the reinforcement cage significantly delays the stress attenuation of the expanded section.Under the same load conditions,the stress of the underreamed anchor equipped with expandable reinforcement cage at the latter half of the expanded section is significantly higher than that of the ordinary underreamed an-chor.关键词
扩大头锚杆/钢筋笼/破坏模式/极限承载力/锚固机理Key words
underreamed anchor/reinforcement cage/failure mode/ultimate bearing capacity/anchoring mechanism分类
土木建筑引用本文复制引用
戴国亮,许晨浒,柳鸿博,郭庆,项宇凡..变直径钢筋笼扩大头锚杆扩体段结构力学性能试验研究[J].东南大学学报（自然科学版）,2025,55(6):1549-1563,15.基金项目
国家自然科学基金资助项目(52378328,52208333,52178317) （52378328,52208333,52178317）
东南大学南通海洋高等研究院基金资助项目(KP202404,GP202403). （KP202404,GP202403）
