分布式传感光纤与土体变形耦合性能测试方法研究

发布时间：2018-04-15 01:20

本文选题：分布式光纤传感技术 + OBR　；参考：《高校地质学报》2017年04期

【摘要】：分布式光纤传感作为新兴技术已用于岩土体的变形监测,其中传感光纤与土体的变形耦合性能是重要的研究内容之一。文章设计了土条的三点弯曲试验,将传感光纤预埋在土条中,借助高空间分辨率OBR分布式光纤传感技术、激光位移传感器以及PIV摄影测量技术,对光纤与土体的变形耦合性能进行了分析讨论。结果表明:当土条变形较小时,土体与光纤耦合性能良好,传感光纤可以准确测量相应位置土体的应变分布情况;当变形较大时,传感光纤与土体将发生相对滑移,土体变形难以完全传递给传感光纤,光纤与土体的变形耦合性能随土体变形的增大逐渐降低。提出了采用应变传递系数表征纤-土的变形耦合性能。
[Abstract]:As a new technology, distributed optical fiber sensing has been used in deformation monitoring of rock and soil, among which the coupling performance of sensing fiber and soil is one of the important research contents.In this paper, the three-point bending test of soil strip is designed, the sensing fiber is embedded in the soil strip, the high spatial resolution OBR distributed optical fiber sensing technology, the laser displacement sensor and the PIV photogrammetry technology are used.The deformation coupling performance of fiber and soil is analyzed and discussed.The results show that when the deformation of soil strip is small, the coupling performance of soil and optical fiber is good, the strain distribution of soil can be accurately measured by the sensing fiber, and when the deformation is large, the relative slip between the sensing fiber and soil will occur.The deformation of soil is difficult to be completely transferred to the sensing fiber, and the coupling property of the fiber and soil decreases with the increase of soil deformation.The strain transfer coefficient is used to characterize the deformation coupling property of fiber-soil.
【作者单位】：南京大学地球科学与工程学院;
【基金】：国家自然科学基金(41572271;41272315) 江苏省自然科学基金(BK20161239)
【分类号】：TU433

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