本文選題：分布式光纖傳感技術(shù) + OBR　； 參考：《高校地質(zhì)學(xué)報(bào)》2017年04期

【摘要】：分布式光纖傳感作為新興技術(shù)已用于巖土體的變形監(jiān)測(cè),其中傳感光纖與土體的變形耦合性能是重要的研究?jī)?nèi)容之一。文章設(shè)計(jì)了土條的三點(diǎn)彎曲試驗(yàn),將傳感光纖預(yù)埋在土條中,借助高空間分辨率OBR分布式光纖傳感技術(shù)、激光位移傳感器以及PIV攝影測(cè)量技術(shù),對(duì)光纖與土體的變形耦合性能進(jìn)行了分析討論。結(jié)果表明:當(dāng)土條變形較小時(shí),土體與光纖耦合性能良好,傳感光纖可以準(zhǔn)確測(cè)量相應(yīng)位置土體的應(yīng)變分布情況;當(dāng)變形較大時(shí),傳感光纖與土體將發(fā)生相對(duì)滑移,土體變形難以完全傳遞給傳感光纖,光纖與土體的變形耦合性能隨土體變形的增大逐漸降低。提出了采用應(yīng)變傳遞系數(shù)表征纖-土的變形耦合性能。
[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.
【作者單位】： 南京大學(xué)地球科學(xué)與工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(41572271;41272315) 江蘇省自然科學(xué)基金(BK20161239)
【分類號(hào)】：TU433

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本文編號(hào)：1751879