GFRP抗浮锚杆界面黏结性能现场试验

doi:10.13722/j.cnki.jrme.2021.0799

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摘要基于光纤光栅传感测试技术，通过对GFRP筋和钢筋抗浮锚杆现场拉拔破坏性试验，分析GFRP抗浮锚杆锚筋–灌浆体界面、浆–岩界面黏结特性，揭示锚固长度、锚筋材质、锚筋直径等因素对2种材质抗浮锚杆锚筋–灌浆体界面、浆–岩界面黏结强度的影响规律。结果表明：(1) GFRP筋和钢筋抗浮锚杆的破坏形式主要为拔断破坏和剪切滑移破坏；锚固长度为4.5，6.5 m的GFRP抗浮锚杆破坏荷载分别是同规格钢筋抗浮锚杆的1.21和1.13倍；GFRP抗浮锚杆锚筋–灌浆体界面的平均黏结强度高于钢筋锚杆，在0.99～1.03 MPa范围；锚固长度是影响抗浮锚杆锚筋–灌浆体界面黏结强度的最重要因素。(2) GFRP抗浮锚杆浆–岩界面轴向应力在孔口处最大，随深度增加而降低；浆–岩界面剪应力呈先增大后减小趋势，在锚固深度约0.5 m处剪应力达到峰值；通过对比不同材质、不同型号的抗浮锚杆发现，钢筋抗浮锚杆浆–岩界面黏结性能略高于GFRP抗浮锚杆，且随锚筋直径增大而提高。(3) GFRP抗浮锚杆锚筋、灌浆体与岩土体三者之间协同作用效果高于钢筋抗浮锚杆。

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关键词 ：基础工程, GFRP抗浮锚杆, 界面, 黏结性能, 影响因素, 黏结&ndash, 滑移, 现场试验, 光纤光栅传感器

Abstract：Based on the fiber Bragg grating sensing test technology，the field pull-out destructive tests of GFRP bars and steel anti-floating anchors were performed. The bonding characteristics of the bar-slurry interface and the slurry-rock interface of GFRP anti-floating anchors were analyzed，and the influences of the anchorage length，the anchor material，the anchor diameter and other factors on the interface bond strength of two kinds of anti-floating anchors were revealed. The results show that the failure modes of GFRP bars and steel anti-floating anchors are mainly pull-off failure and shear-slip failure while the failure loads of GFRP anti-floating anchors with anchoring lengths of 4.5 and 6.5 m are 1.21 and 1.13 times that of the steel anti-floating anchors of the same specification，respectively. The average bond strength of the bar-slurry interface of the GFRP anti-floating anchors，ranging from 0.99 to 1.03 MPa，is higher than that of the steel anchor rods. The anchorage length is the most important factor that affects the bond strength of the bar-slurry interface of the anti-floating anchors. The axial stress of the slurry-rock interface of the GFRP anti-floating bolts decreases with increasing the depth，reaching a largest value at the orifice，while the shear stress of the slurry-rock interface increases first and then decreases with the depth，arriving at a peak at an anchorage depth of about 0.5 m. By comparing different materials and different types of anti-floating anchor rods，it is found that the slurry-rock interface bonding performance of the reinforced anti-floating anchor rods is slightly higher than that of the GFRP anti-floating anchor rods，and increases with the diameter of the anchor rod. The synergistic effect of the GFRP anti-floating anchor bar，the slurry and the surrounding rock and soil is higher than that of the steel anti-floating anchors.

Key words： foundation engineering GFRP anti-floating anchor interface bonding performance influencing factors bonding-slip field test FBG Sensor

引用本文:

白晓宇1，2，井德胜1，王海刚1，张明义1，2，贾玉跃1，2，闫楠1，2. GFRP抗浮锚杆界面黏结性能现场试验[J]. 岩石力学与工程学报, 2022, 41(4): 748-763.
BAI Xiaoyu1，2，JING Desheng1，WANG Haigang1，ZHANG Mingyi1，JIA Yuyue1，2，YAN Nan1，2. Field test of interface bonding performance of GFRP anti-floating anchors. , 2022, 41(4): 748-763.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0799 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I4/748

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