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COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- ANALYSIS ON THERMAL FIELD EVOLUTION OF WUDONGDE ARCH DAM CONSTRUCTION SITE BASE OF DISTRIBUTED OPTICAL FIBER MONITORING Haoyang PENG, Peng LIN *, Zeyu NING Vice president of Department of Hydraulic Engineering, Tsinghua University, Beijing 100084 CHINA 1. INTRODUCTION In mass concrete temperature monitoring, there are mainly two kinds of methods, i.e., thermometer monitoring (traditional thermocouple or RTD) and optical fiber monitoring based on distributed optical fiber temperature sensing technology. With the rapid development of optical fiber sensing technology, the application of distributed optical fiber temperature measurement technology has been widely used in mass concrete temperature monitoring. Comparing to the conventional thermometer that only is available to the certain spot temperature measurements, the distributed optical fiber temperature measurement techniques can monitor the temperature of concrete along the fibers. With the proper arrangement of optical fiber temperature sensing network, the real-time temperature field information of dam interior could be obtained to actualize the dam temperature control. In the aspect of foreign development: Barnoski[1] invented the optical time domain reflectometer (OTDR) in 1976. The University of Southampton originally proposed a distributed optical fiber temperature sensor in 1981. Based on liquid optical fiber laser Raman spectroscopy, Hartog[2] conducted the principle experiment of distributed optical fiber temperature sensor in 1983. DaMn[3], Hartog[4] developed subsequently the experimental device of distributed optical fiber temperature sensor by using argon ion and semiconductor laser light source. 1424