| 冻融循环对GFRP锚杆锚固性能影响的试验研究 |
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| 引用本文： | 朴昇昊,张伟丽,王永一,邓黎.冻融循环对GFRP锚杆锚固性能影响的试验研究[J].地质科技通报,2022,41(6):301-307. |
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| 作者姓名： | 朴昇昊 张伟丽 王永一 邓黎 |
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| 作者单位： | 中国地质大学(武汉)工程学院, 武汉 430074 |
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| 基金项目： | 国家自然科学基金项目41302232中国地质大学(武汉)基础科研训练计划1910491025 |
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| 摘 要： | 针对季冻区春融期岩锚失效的问题, 研究了玻璃纤维(GFRP)锚杆在冻融循环作用下的锚固能力。通过设计物理模型对经历25, 50, 75冻融周期的试块进行了加载试验, 根据试验数据和破坏现象分析了GFRP锚杆在冻融后锚杆应力和承载力的变化规律。研究结果表明: 冻融循环会导致环氧树脂砂浆与混凝土的黏结性能下降, 在25, 50, 75周期后承载力损失分别为38.24%, 42.65%, 52.94%。冻融循环加速黏结材料及围岩的材料性能劣化, 荷载向内部传递加速, 使得GFRP锚杆上各点之间的应力差值逐渐减小, 锚杆应力分布比常温状态下更趋于均匀, 但材料性能的劣化导致局部破坏提前, 锚杆整体承载性能降低。研究结果可以为GFRP锚杆的工程应用提供建议。
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| 关 键 词： | GFRP锚杆 锚杆应力 承载力 冻融循环 锚固能力 |
| 收稿时间： | 2021-05-19 |
Experimental study on the influence of freeze-thaw cycles on the anchoring performance of GFRP anchor |
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| Affiliation: | Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China |
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| Abstract: | In view of the failure of rock anchors in spring thawing periods of seasonal freezing areas, this paper aims to investigate the anchorage ability of GFRP anchors under the action of freeze-thaw cycles.Through designing the physical model, loading tests were carried out on the test blocks experiencing 25, 50, and 75 freeze-thaw cycles.According to the test data and failure phenomena, the variation laws of the stress and bearing capacity of the GFRP bolt after freeze-thaw were analyzed.The results show that the freeze-thaw cycle will lead to a decrease in bonding performance between epoxy resin mortar and concrete. After 25, 50 and 75 cycles, the bearing capacity loss is 38.24%, 42.65% and 52.94%, respectively.The ultimate bearing capacity of the bolt decreases obviously with increasing freeze-thaw cycles. The freeze-thaw cycle accelerates the deterioration of the material properties of the bonding material and the surrounding rock. In the process, the load transfer to the interior is accelerated, leading to a reduction in the stress difference among points on the GFRP bolt, and the stress distribution of the bolt is more uniform than that at room temperature. Meanwhile, the deterioration of the material properties leads to local failure ahead of time, and the overall bearing capacity of the bolt is reduced.The research results can provide suggestions for the engineering application of GFRP anchor. |
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