抗浮锚杆荷载-位移特性及极限承载力预测
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TU473

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国家自然科学基金资助项目(51708316);中国博士后科学基金面上项目(2018M632641);山东省博士后创新项目(201903043);山东省高等学校科技计划项目(J16LG02);青岛市博士后应用研究资助项目(2018101)


Load-displacement characteristics and ultimate bearing capacity prediction of anti-floating anchor
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    摘要:

    GFRP(玻璃纤维增强聚合物)抗浮锚杆因其布置灵活、分散应力、耐腐蚀性强、绿色环保等优点,成为钢筋抗浮锚杆的良好替代品。为进一步研究GFRP抗浮锚杆的承载性能,本文基于青岛某基坑抗浮工程中的6根GFRP筋和钢筋锚杆开展现场拉拔破坏性试验。试验结果表明:钢筋锚杆与GFRP锚杆平均破坏荷载分别为324 kN、394 kN,锚固强度利用率均达到92%。在相同直径、相同锚固长度条件下,GFRP锚杆能够承受更大的拉拔力,且发挥了更大的黏结强度。在荷载-相对滑移曲线分析中,GFRP抗浮锚杆整体呈缓“S”型,钢筋锚杆整体呈“L”型,表明GFRP锚杆抗浮性能优于钢筋锚杆。根据二次多项式回归分析,当锚杆杆体位移量小于20 mm时,预测精度较高,最高可达96.15%。研究结果对实际抗浮工程应用具有一定的借鉴和参考价值。

    Abstract:

    GFRP (glass fiber reinforced polymer) anti-floating anchors has become a good substitute for steel anti-floating anchors because of its flexible layout, dispersed stress, strong corrosion resistance and green environmental protection. In order to further study the bearing capacity of GFRP anti-floating anchor, field pull-out destructive test was carried out based on six GFRP bolts and reinforced anchors in a foundation pit anti-floating project in Qingdao. The test results show that the average failure load of reinforced bolt and GFRP bolt is 324 kN and 394 kN respectively, and the utilization ratio of anchorage strength is 92 %. Under the conditions of the same diameter and the same anchorage length, GFRP anti-floating anchor can withstand greater drawing force and play a greater bond strength. In the load-slip curve analysis, the overall GFRP anti-floating anchor is slow “ S ” type, and the overall steel anchor is “ L ” type, indicating that the anti-floating performance of GFRP anchor is better than that of steel anchor. According to quadratic polynomial regression analysis, when the displacement of anchor bolt is less than 20 mm, the prediction accuracy is high, up to 96.15 %. The research results have certain reference value for practical anti-floating engineering application.

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井德胜,白晓宇,刘超,等. 抗浮锚杆荷载-位移特性及极限承载力预测[J]. 科学技术与工程, 2021, 21(22): 9570-9576.
Jing Desheng, Bai Xiaoyu, Liu Chao, et al. Load-displacement characteristics and ultimate bearing capacity prediction of anti-floating anchor[J]. Science Technology and Engineering,2021,21(22):9570-9576.

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  • 收稿日期:2021-06-09
  • 最后修改日期:2021-07-07
  • 录用日期:2021-06-16
  • 在线发布日期: 2021-08-29
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