基于OFDR技术的分布式光纤–砂土界面耦合性试验与评价模型研究

doi:10.13722/j.cnki.jrme.2022.0916

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摘要光纤与砂土界面的耦合性研究对于促进光纤传感技术在岩土体监测中的应用具有重要意义。为了解光纤与土体间的作用机制，提出一种评价纤土界面耦合性的新型弹塑性模型，采用光频域反射技术开展考虑含水率、光纤种类、拉拔速率、上覆荷载等因素的室内精细化光纤拉拔试验。研究结果表明：该模型计算简便且可准确描述光纤与土体之间的耦合过程；获得光纤监测土体变形失效的临界应变参考值；模型中的耦合系数ζ可有效评价纤土耦合性能。模型参数灵敏度分析进一步明确光纤–土体相互作用机制，为分布式光纤在土体监测中的应用提供重要参考依据。

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	张敏捷1
	李佳康2
	张峰3
	裴华富3

关键词 ：土力学, 传感光纤, 光频域反射技术(OFDR), 光纤&ndash, 砂土界面, 评价模型, 拉拔试验

Abstract：The study of the interface coupling between the optical fiber and sand is highly significant for the application of optical fiber in rock and soil monitoring. In this study，we proposed a new elastic-plastic model to evaluate the coupling of the fiber-soil interface and conducted an indoor optical fiber pull-out test that took into account moisture content，fiber type，pull-out rate，and overlying load，using optical frequency domain reflection(OFDR). The results demonstrate that the model is straightforward to calculate and accurately describes the stress process between the optical fiber and the soil. The critical strain reference value for optical fiber monitoring soil deformation failure was obtained. The coupling coefficient ζ，which represents the coupling capacity of fiber-soil，can effectively evaluate the coupling performance of the fiber-soil. Furthermore，the sensitivity analysis of model parameters clarifies the interaction mechanism of optical fiber and soil，providing an essential reference for the application of distributed optical fiber in soil monitoring.

Key words： soil mechanics sensing optical fiber optical frequency domain reflection(OFDR) optical fiber-sand interface evaluation model pullout test

引用本文:

张敏捷1，李佳康2，张峰3，裴华富3. 基于OFDR技术的分布式光纤–砂土界面耦合性试验与评价模型研究[J]. 岩石力学与工程学报, 2024, 43(S1): 3557-3567.
ZHANG Minjie1，LI Jiakang2，ZHANG Feng3，PEI Huafu3. Research on experiment and evaluation model of interface coupling #br# between distributed optical fiber and sand based on OFDR#br#. , 2024, 43(S1): 3557-3567.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0916 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/IS1/3557

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