基于分布式光纤测温技术的堤坝渗漏监测研究
发布时间：2018-07-20 21:17
【摘要】：分布式光纤传感技术以其巨大的优势开始被研究者运用于渗漏监测中,而对于运用何种分布式光纤技术、如何布设光纤及有何适用范围等诸多问题,并没有得到解决,据此本文进行了如下内容的研究： 1、分析比较六种渗漏监测方法的优缺点和分布式光纤温度传感技术用于渗漏监测的理论可行性和优势；对比基于瑞利、布里渊和拉曼散射原理的3种分布式温度传感技术的特点,并构建了一套分布式光纤传感自动化渗漏监测系统。 2、从理论上推导了各向异性的二维稳定渗流场和在渗流场作用下的温度场计算方程,为温度场模型分析提供理论支持。 3、通过室内试验和现场试验,对比分析布里渊法和拉曼法在渗漏监测上的适用性、适用条件、稳定性和精度以及拉曼法本身的梯度法和加热法的优缺点和适用条件；结合试验现场的光纤铺设经验,提供了一些关于光纤铺设位置、方法和注意点的建议。 4、利用有限元软件建立堤坝渗流模型模拟现场情况,分析渗流场和温度场云图；重点分析了坝基中最大流速和最大温度变化(率)的分布规律,据此确定光纤铺设的最佳位置范围。 本论文研究得到的主要重要结论包括：1、布里渊法和拉曼法在渗漏监测上都具有可行性,前者更需要注重保护工作；后者在稳定性、精度和耐环境影响能力上都更具有优势；2、加热法能够提高渗漏监测敏感性,但梯度法更实用,而实际工程中加热法须谨慎使用；3、分布式光纤的最佳铺设位置是坝体底部和外坡脚附近,离外坡脚越远,光纤须埋得越深。
[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.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV698.1
本文编号：2134807
[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.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV698.1
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