光纤光栅-水暖循环集成系统监测渗流的试验研究  

Experiment Study of Seepage Monitoring with FBG-water Cycling Integrated System

作　　者：陈江[1] 程飞[2] 昝亚锋 葛琪[1] 熊峰[1] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]四川大学轻纺与食品学院,四川成都610065 [3]华能澜沧江水电股份有限公司漫湾水电厂,云南临沧677000

出　　处：《四川大学学报（工程科学版）》2016年第6期51-57,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51509174);四川省科技厅应用基础研究资助项目(2015JY0235)

摘　　要：为了解决土石坝渗流常规监测手段空间不连续、效率低等缺陷,基于温度示踪法中的加热法,提出了将光纤光栅温度传感系统与水暖循环供热系统相结合的新型监测体系。该集成系统采用锅炉作为加热设备,热水通过分集水器分配到各条供暖管路进行循环加热,光纤光栅温度传感器预埋在供暖管内测量管道内热水的温度,根据温度场与渗流场的相关性间接获得渗流状态。基于牛顿冷却定律,提出根据管路降温曲线拟合出系数ζv并将其作为判别指标识别渗漏状态的新方法。建立了集中渗漏的试验模型,考虑了渗漏通道的位置、数量及渗漏强度等影响因素进行多工况试验,试验结果表明:降温阶段的温度实测数据与按牛顿冷却定律确定的温度变化数学模型基本相符,采用ζv作为判别指标能很好地进行渗漏的定位,其量值与渗漏强度定性相符。因此,本文提出的渗流监测系统及渗流状态识别方法是有效的。Based on the heating method included in the temperature tracer method, a new monitoring system characterized by combinations of FBG sensors and the water cycling heating system was presented to apply on the leakage monitoring of rock-fill dam, aiming to overcome the disadvantages of conventional means, such as spatial discontinuity and execution inefficiency. The main structure of this novel system was designed by embedding the FBG sensors in the pipes of the water cycling heating system. Several major components of this system including boiler, sub-water catcher, heating pipeline, and FBG temperature sensors can play the functions of heating, allocation, transporting and monitoring, respectively. The temperature of heated water along the pipeline can be measured by embedded FBG. Based on the operational principle of this monitoring system, a series of experiments that take the influence factor of leakage passage （location and amount） and leakage intensity into account were carried out for simulating the concentrated leakage monitoring. A cooling curve can be derived from the measured temperature data using Newton＇ s Law of cooling. The testing results in temperature decreasing phase are basically accorded with fitting results determined by Newton＇ s law of cooling. The coefficienζv fitted from cooling curve can be used as the key factor to identify the location and quantity of leakage, because the magnitude of ζv has a good agreement with the leakage state. Therefore, the seepage monitoring system and its corresponding leakage identifying method are valid.

关 键 词：土石坝安全监测 温度示踪法 光纤传感 水循环加热 牛顿冷却定律 

分 类 号：TV871[水利工程—水利水电工程]