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首页> 外文期刊>Smart Materials & Structures >Deformation monitoring of long GFRP bar soil nails using distributed optical fiber sensing technology
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Deformation monitoring of long GFRP bar soil nails using distributed optical fiber sensing technology

机译：利用分布式光纤传感技术监测长GFRP筋土钉的变形

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摘要

This paper introduces a new measurement technology characterized by the use of distributed optical fiber sensor (OFSs) for monitoring the strain and temperature distribution of glass fiber reinforced polymer (GFRP) bar soil nails. Laboratory tension tests were used to verify the performance of the OFSs for strain and elongation monitoring of GFRP bars. The measured strain data from the OFSs agree fairly well with the data from strain gauges in calibration tests. In field monitoring tests, two GFRP bar soil nails were installed with OFSs and pure strain data were used to evaluate the performance of GFRP bar soil nails after installation in a practical slope. Both the strain and temperature distributions measured by the OFSs show symmetric features. A Brillouin optical time domain analysis (BOTDA) measurement unit was used to collect temperature and strain data from the OFSs. The monitoring data show that the accumulative elongations of the soil nails present a continuous but limited increase with time in the field. The achieved maximum elongations of soil nails were less than 0.4 mm. The measured axial elongations of the soil nails were also validated using corresponding data predicted by a theoretical model. The test results from the present study prove that BOTDA based sensors are useful for the investigation of the average strain distributions (or elongation) of long soil nails and these data are useful for the estimation of the potential sliding surface of the entire soil nailing system.
机译：本文介绍了一种新的测量技术，其特征在于使用分布式光纤传感器（OFS）来监测玻璃纤维增​​强聚合物（GFRP）棒状土钉的应变和温度分布。使用实验室张力测试来验证OFS的性能，以监测GFRP钢筋的应变和伸长率。在校准测试中，从OFS测得的应变数据与应变计的数据非常吻合。在现场监测测试中，安装了两个装有OFS的GFRP筋土钉，并使用纯应变数据评估了在实际坡度上安装后GFRP筋土钉的性能。 OFSs测量的应变和温度分布均显示对称特征。布里渊光学时域分析（BOTDA）测量单元用于从OFS收集温度和应变数据。监测数据表明，土钉的累积伸长率在田间随时间呈连续但有限的增加。所达到的土钉最大伸长率小于0.4mm。还使用理论模型预测的相应数据验证了土钉的轴向测量伸长率。来自本研究的测试结果证明，基于BOTDA的传感器可用于研究长土钉的平均应变分布（或伸长），这些数据可用于估算整个土钉系统的潜在滑动面。

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