【摘要】：分布式光纖傳感技術(shù)以其巨大的優(yōu)勢(shì)開(kāi)始被研究者運(yùn)用于滲漏監(jiān)測(cè)中,而對(duì)于運(yùn)用何種分布式光纖技術(shù)、如何布設(shè)光纖及有何適用范圍等諸多問(wèn)題,并沒(méi)有得到解決,據(jù)此本文進(jìn)行了如下內(nèi)容的研究： 1、分析比較六種滲漏監(jiān)測(cè)方法的優(yōu)缺點(diǎn)和分布式光纖溫度傳感技術(shù)用于滲漏監(jiān)測(cè)的理論可行性和優(yōu)勢(shì)；對(duì)比基于瑞利、布里淵和拉曼散射原理的3種分布式溫度傳感技術(shù)的特點(diǎn),并構(gòu)建了一套分布式光纖傳感自動(dòng)化滲漏監(jiān)測(cè)系統(tǒng)。 2、從理論上推導(dǎo)了各向異性的二維穩(wěn)定滲流場(chǎng)和在滲流場(chǎng)作用下的溫度場(chǎng)計(jì)算方程,為溫度場(chǎng)模型分析提供理論支持。 3、通過(guò)室內(nèi)試驗(yàn)和現(xiàn)場(chǎng)試驗(yàn),對(duì)比分析布里淵法和拉曼法在滲漏監(jiān)測(cè)上的適用性、適用條件、穩(wěn)定性和精度以及拉曼法本身的梯度法和加熱法的優(yōu)缺點(diǎn)和適用條件；結(jié)合試驗(yàn)現(xiàn)場(chǎng)的光纖鋪設(shè)經(jīng)驗(yàn),提供了一些關(guān)于光纖鋪設(shè)位置、方法和注意點(diǎn)的建議。 4、利用有限元軟件建立堤壩滲流模型模擬現(xiàn)場(chǎng)情況,分析滲流場(chǎng)和溫度場(chǎng)云圖；重點(diǎn)分析了壩基中最大流速和最大溫度變化(率)的分布規(guī)律,據(jù)此確定光纖鋪設(shè)的最佳位置范圍。 本論文研究得到的主要重要結(jié)論包括：1、布里淵法和拉曼法在滲漏監(jiān)測(cè)上都具有可行性,前者更需要注重保護(hù)工作；后者在穩(wěn)定性、精度和耐環(huán)境影響能力上都更具有優(yōu)勢(shì)；2、加熱法能夠提高滲漏監(jiān)測(cè)敏感性,但梯度法更實(shí)用,而實(shí)際工程中加熱法須謹(jǐn)慎使用；3、分布式光纖的最佳鋪設(shè)位置是壩體底部和外坡腳附近,離外坡腳越遠(yuǎn),光纖須埋得越深。
[Abstract]:Distributed optical fiber sensing technology has been applied to leakage monitoring with its great advantage. However, many problems such as what kind of distributed optical fiber technology, how to set up optical fiber and what scope of application have not been solved, and so on, have not been solved. In this paper, the following contents are studied: 1. The advantages and disadvantages of six leakage monitoring methods and the theoretical feasibility and advantages of distributed optical fiber temperature sensing technology for leakage monitoring are analyzed and compared, and the comparison is based on Rayleigh. Features of three distributed temperature sensing techniques based on Brillouin and Raman scattering principles, A distributed optical fiber sensing automatic seepage monitoring system is constructed. 2. The anisotropic two-dimensional steady seepage field and the calculation equation of temperature field under the action of seepage field are derived theoretically. This paper provides theoretical support for the analysis of temperature field model. 3. Through laboratory and field tests, the applicability and applicable conditions of Britannia method and Raman method in seepage monitoring are compared and analyzed. The stability and precision, the advantages and disadvantages of the gradient method and the heating method of Raman method, and the application conditions of the raman method, and the experience of fiber laying in the field of the test provide some information on the location of the fiber laying. Methods and suggestions for attention. 4. The seepage model of embankment is established by finite element software to simulate the field situation, and the cloud map of seepage field and temperature field is analyzed, and the distribution law of maximum velocity and maximum temperature change (rate) in dam foundation is analyzed. Based on this, the optimum position range of fiber laying is determined. The main conclusions of this paper include: 1, Britannia method and Raman method are feasible in leakage monitoring, the former need more protection, the latter have more advantages in stability, precision and environmental impact resistance; 2. The sensitivity of leakage monitoring can be improved by heating method, but the gradient method is more practical, and the heating method should be used carefully in practical engineering. The best location of distributed optical fiber is near the bottom of dam body and the foot of the outer slope, and the farther away from the foot of the outer slope, The deeper the fiber is buried.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TV698.1

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