Precise Localization of Segmental and Continuous Temperature-measuring Optical Fiber in a Concrete Dam

被引：0
|
作者：
Liang Z. [1 ]
Zhou H. [1 ]
Zhao C. [1 ,2 ]
Liu Q. [3 ]
Zhou Y. [1 ,2 ]
Gong P. [4 ]
机构：
[1] College of Hydraulic & Environmental Eng., China Three Gorges Univ., Yichang
[2] Hubei Key Lab. of Construction and Management in Hydropower Eng., China Three Gorges Univ., Yichang
[3] School of Water Resources and Hydropower Eng., Wuhan Univ., Wuhan
[4] China Three Gorges Projects Development Co., Ltd., Chengdu
来源：
Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2020年 / 52卷 / 03期
关键词：
Accurate space-location; Bifilar embedded; Concrete dam; Data symmetry analysis; VTMOF;
D O I：
10.15961/j.jsuese.201900565
中图分类号：
学科分类号：
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. © 2020, Editorial Department of Advanced Engineering Sciences. All right reserved.
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页码：52 / 61
页数：9
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