Study on the Temperature of Super Long Cast-in-place Pile on the Island Using Optical Fiber Sensing Technology

In order to make up for the shortcomings of traditional monitoring methods and understand the temperature distribution of super long cast-in-place piles on the island, the Brillouin optical time domain reflectometer technology（BOTDR） is used, the optical fiber temperature sensor is fixed on the cast-in-place pile, and the temperature of the 116m long cast-in-place pile under the air temperature fluctuation is measured by long-term monitoring in this paper. The monitoring results show that: the optical fiber sensors used for the temperature monitoring of the super long cast-in-place pile all survived, indicating the rationality of the sensor layout method. It can be inferred from the monitoring results that the optical fiber temperature sensor is not disturbed by external forces; the DB5 wavelet is used to reduce the noise of the optical fiber data. From the pile temperature curve, the temperature change of the super long cast-in-place pile on the island is very complex, the temperature change at the pile head