Large-diameter rock-socketed piles are used to support the pier with the height of 195 m at Hezhang bridge

to acquire its bearing behaviors

distributed fiber optic sensing technology is implemented to monitor the continous distributed strains of the large-diameter rock-socketed piles. At first

indoor model tests are performed to verify that the fiber optic technology is available to monitor the compressive strain when the pile is loaded. And then

the design and in-situ installation of fiber optic sensors is carried out on the basis of Hezhang bridge; and the testing data during construction are collected as well. Through the data treatment and analysis

the bearing behaviors and load transfer mechanism of the large-diameter rock-socketed piles are researched. Comparing with the actual settlement of the support engineering

fiber optic sensing technology is further testified to be feasible. The research results have reference value for pile theory and the application of fiber optic sensing technology to similar projects.