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| BFRP锚杆锚固质量的导波检测试验研究 |
| Experimental study of guided wave detection of anchorage quality of BFRP bolt |
| 投稿时间：2024-01-17 修订日期：2024-03-09 |
| DOI： |
| 中文关键词: BFRP锚杆 锚固质量 导波波速 脱锚缺陷 衰减差异比值 |
| 英文关键词:BFRP bolt anchorage quality guided wave velocity debond defect attenuation difference ratio |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 为探究导波在玄武岩纤维增强聚合物（BFRP）锚杆中的传播特性，实现对BFRP锚杆锚固质量的导波评价，开展了自由BFRP锚杆及BFRP锚杆锚固结构的导波检测试验，对导波在锚杆中传播的波形、波速和衰减等声学参数进行了分析。试验结果显示：①导波在不同直径自由BFRP锚杆中传播时，16mm锚杆较20mm锚杆中导波传播的波速更大、衰减更小。②导波在BFRP锚杆锚固结构中传播时，导波的波速和衰减随养护龄期变化趋势总体一致：前7天有大幅下降，之后趋于稳定。③35~70kHz频段内的导波在有脱锚缺陷的锚固模型中比在无缺陷的锚固模型中传播的衰减值更大，且缺陷位置越远离激发端，导波衰减值相对越大。④引入衰减差异比值的概念，得到了衰减差异比值与脱锚缺陷位置的指数关系式，实现了BFRP锚杆锚固结构中脱锚缺陷位置的导波定量评价。 |
| 英文摘要: |
| In order to investigate the propagation characteristics of guided waves in Basalt Fiber Reinforced Polymer (BFRP) bolts and evaluate the anchoring quality of anchored BFRP bolts using guided wave testing, free BFRP bolts and anchored BFRP bolt structures were subjected to guided wave experiments. The acoustic parameters of waveforms, wave velocities, and attenuation during the propagation of guided waves in the anchored bolts were analyzed. The experimental results showed that: (1) When guided waves propagate in free BFRP bolts of different diameters, the wave velocity is higher and the attenuation is lower in the 16mm bolt compared to the 20mm bolt. (2) When guided waves propagate in the anchored BFRP bolt structures, the trends of wave velocity and attenuation vary with the curing time: there is a significant decrease during the first 7 days, followed by a stabilization. (3) In the frequency range of 35-70kHz, the attenuation of guided waves in anchored models with anchor debond defects is larger than in models without debond defects, and the farther the defect is from the excitation end, the greater the attenuation. (4) By introducing the concept of attenuation difference ratio, an exponential relationship between the attenuation difference ratio and the position of the debond defect was obtained. This enables a quantitative evaluation of the debond defect position in the guided wave assessment of anchored BFRP bolt structures. |
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