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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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

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0799 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I4/748

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