An experimental study: Fiber Bragg grating-hydrothermal cycling integration system for seepage monitoring of rockfill dams
An experimental study: Fiber Bragg grating-hydrothermal cycling integration system for seepage monitoring of rockfill dams
复制标题
堆石坝渗流监测光纤布拉格光栅-水热循环一体化系统实验研究
DOI：
10.1177/1475921716661874
复制
发表时间：
2017-01-01
影响因子：
6.6
通讯作者：
Zhang, Shaojie
中科院分区：
文献类型：
--
作者：
Chen, Jiang;Cheng, Fei;Zhang, Shaojie
为了弥补传统堆石坝渗流监测空间不合理、效率低的缺陷，提出了一种基于温度示踪法中的加热技术的新型监测系统，即光纤布拉格光栅温度传感与水热循环一体化系统。该系统以锅炉为加热装置，锅炉热水通过再分布器和环形温差管道进入，预埋光纤布拉格光栅传感器测量水温，从而从温度和渗流的相关场中识别出渗流行为。根据牛顿冷却定律，用管道冷却曲线拟合出一个系数(V)，作为判别渗流状态的一种新方法。经标定试验证明，冷却期的温度-时间-行程曲线与牛顿冷却定律下的温度变化数学模型基本一致，从而可以通过(V)的拟合公式来反演渗流速度。在建立了集中渗漏的位置、渗漏通道数量和渗漏率的试验模型的基础上，进行了多工况试验，结果表明，该方法具有定位渗漏和定量渗流速度的能力，是一种有效的渗漏监测识别方法。
In order to make up defects liable for the conventional monitoring of rockfill dam seepage in spatial inconsequence and low efficiency, a new monitoring system is proposed based on the heating technique incorporated in the temperature tracer method, that is, the integrated system of fiber Bragg grating temperature sensing and hydrothermal cycling. The system has a boiler as its heating device, and heated water from boiler is admitted through redistributor and circular warm pipelines, in which fiber Bragg grating sensors are embedded in advance for measuring the water temperature, thereby the seepage behavior is identified from the correlative fields of temperature and seepage. A coefficient (v), according to Newton's law of cooling, is then fitted out by pipeline cooling curves and used as a new way to identify the seepage state. The temperature-time-travel curves for the cooling period have proved by calibration tests to be, in general, consistent with the mathematical model of temperature variations under Newton's law of cooling, thereby to inverting the seepage velocity through the fitting formula of it with (v). With the test model of concentrative leakage established in regard to the location, amount of leakage passages, and leakage rate, multi-condition tests have been conducted which conclude that the proposed method is capable of positioning leakage and quantifying seepage velocity; therefore, it is valid for seepage monitoring and identification.