Page - 1433 - in Book of Full Papers - Symposium Hydro Engineering

1985. [4] Hartog A H, Leach A P, Gold M P. Distributed temperature sensing in solid- core fibres[J]. Electronics Letters, 1985, 21(23): 1061-1062. [5] Zhang Zaixuan, Liu Tianfu.Laser Raman-type Distributed optical fiber Sensor System[J]. ACTA OPTOCAL SINICA, 1995(11):1585-1589. [6] Zhang Zaixuan, Feng Haiqi. Distributed optical fiber Raman photonic sensor system[J]. Semiconductor Optoelectronics, 1999(02):83-85. [7] Cai Shunde, Cai Desuo. An Analysis on Monitoring Hydration Heat of the Large Cubage Concrete with the Distributed Fibre [J]. J of China Three Gorges Univ. (Uatural Sciences), 2002(06):481-485. [8] TANG Guoqing,ZHOU Yihong. Remote control of distributed temperature sensing for dam temperature monitoring of Xiluodu Hydropower Station [J]. Yangtze River,2012,43(23):92-95. [9] Yu Xiangdong, Zhang Zaixuan. An Intelligent Temperature Compensating Circuit for Distributed Optical Fiber Raman Temperature Sensor[J]. ACTA PHOTONICA SINICA, 2011,40(12):1870-1874. SUMMARY Temperature monitoring is the basis for the mass concrete temperature control and is of great significance for the prevention of concrete cracking. According to the requirement of dam concrete temperature control during construction, a set of complete on-site operation technology was put forward based on distributed optical fiber temperature measurement technology and on-line temperature measurement software of optical fiber was also developed. Taking the low-heat concrete of Wudongde arch dam as a case, the temperature data of on- site concrete was collected in real time using the distributed optical fiber temperature measurement system, and the law of temperature evolution of low- heat concrete was analyzed. The results show that the distributed optical fiber temperature measurement system is effective, accurate and reliable, and the real temperature field of concrete can be obtained. The temperature of low thermal concrete in Wudongde is obviously at low level at early age, which helps to reduce cracking risk of dam. KEY WORDS Distributed optical fiber, temperature measurement, thermal field evolution, mass concrete, Wudongde arch dam. 1433