混凝土坝分段连续测温光纤测点精准定位方法研究
Precise Localization of Segmental and Continuous Temperature-measuring Optical Fiber in a Concrete Dam
作者：梁志鹏(三峡大学 水利与环境学院, 湖北 宜昌 443002)；周华维(三峡大学 水利与环境学院, 湖北 宜昌 443002)；赵春菊(三峡大学 水利与环境学院, 湖北 宜昌 443002;三峡大学 湖北省水电工程施工与管理重点实验室, 湖北 宜昌 443002)；刘全(武汉大学 水利水电学院, 湖北 武汉 430000)；周宜红(三峡大学 水利与环境学院, 湖北 宜昌 443002;三峡大学 湖北省水电工程施工与管理重点实验室, 湖北 宜昌 443002)；龚攀(中国三峡建设管理有限公司, 四川 成都 610000)
Author：LIANG Zhipeng(College of Hydraulic & Environmental Eng., China Three Gorges Univ., Yichang 443002, China)；ZHOU Huawei(College of Hydraulic & Environmental Eng., China Three Gorges Univ., Yichang 443002, China)；ZHAO Chunju(College of Hydraulic & Environmental Eng., China Three Gorges Univ., Yichang 443002, China;Hubei Key Lab. of Construction and Management in Hydropower Eng., China Three Gorges Univ., Yichang 443002, China)；LIU Quan(School of Water Resources and Hydropower Eng., Wuhan Univ., Wuhan 430000, China)；ZHOU Yihong(College of Hydraulic & Environmental Eng., China Three Gorges Univ., Yichang 443002, China;Hubei Key Lab. of Construction and Management in Hydropower Eng., China Three Gorges Univ., Yichang 443002, China)；GONG Pan(China Three Gorges Projects Development Co., Ltd., Chengdu 610000, China)
收稿日期：2019-06-05 年卷（期）页码：2020,52(3):52-61
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：混凝土坝;有效测温光纤;双股埋设;数据对称分析;精准定位
Key words：concrete dam;VTMOF;bifilar embedded;data symmetry analysis;accurate space-location
基金项目：国家自然科学基金项目（51779131）；中国博士后科学基金面上项目（2018M642885）；三峡大学博士学位论文培优基金项目（20202BSPY010）
中文摘要
分布式测温光纤连续监测大坝多仓混凝土温度时存在测温位置定位不准确的问题，精准定位光纤测点对获取混凝土坝真实温度分布具有非常重要的意义。为准确识别连续测温功能区间和定位有效测温光纤段，首先，结合混凝土坝分布式光纤双股绑扎埋设施工工艺，分析了光纤测温数据的结构特征；其次，建立了基于翻转、平移和曲线拟合的数据对称分析数学模型，确定了新浇仓双股光纤原始监测数据的对称中心；最后，结合浇筑仓埋设光纤关键测点米标记录值、每段有效测温光纤的实际埋设长度、混凝土平均浇筑温度、收仓后24 h内光纤测温原始数据及现场实测气温数据，确定了新浇仓有效测温光纤测点数量、光纤玻璃芯感温位置(Length)与仓内监测位置的对应关系，从而实现了新浇仓有效测温光纤段每个测点空间位置的精准定位。白鹤滩工程应用结果表明，利用该方法可准确确定新浇仓有效测温光纤测点空间位置，并利用点温度计与同位置光纤测点监测温度数据对比验证，结果表明21 d 龄期内两者绝对差值基本在0.8 ℃以内，同一位置处光纤测与点温度计测温值吻合较好，验证了本文提出的精准定位结果精度和可靠性高。目前已成功完成白鹤滩大坝5个典型坝段共计161仓光纤测点的精准定位，为获取精确可靠的混凝土坝光纤测温原始数据提供了技术保障。
英文摘要
The spatial positioning of temperature-measuring optical fibers is of great significance for accurately grasping the real temperature distribution of a concrete dam. To solve the difficult positioning problem of a single optical fiber in the process of continuous monitoring temperature in a concrete dam, a mathematical model of data symmetry analysis based on mirroring and shifting and curve fitting of data was established and proposed to confirm the symmetry center of original data monitored by bifilar embedded optical fiber through combining with temperature measuring principle of distributed temperature sensing (DTS) system, bifilar embedded construction technology of optical fiber and characteristics of optical fiber temperature measuring data in a concrete dam. On that basis, the number of measuring points of valid temperature-measuring optical fibers and the corresponding relationship between monitoring length and embedded optical fiber meter identification can be confirmed. Then a space-location method of valid temperature-measuring fiber for new pouring block was proposed. The engineering application result indicated that the temperature-measuring section of valid temperature-measuring optical fiber and space position corresponding to each measurement points could be accurately determined by using the space-location method. The comparative analysis results indicated that the differences of monitoring temperature value between three temperature measuring points of optical fiber and thermometers were mostly within 0.8 ℃, and the space-location result was accurate and reliable. Up to now, the method has been successfully applied to more than 160 warehouses of 5 typical dam monoliths for Baihetan arch dam. The proposed precise localization method provided the accurate and reliable original data for the research work of temperature state analysis and safety evaluation of Baihetan arch dam.
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