基于分布式光纤测试技术的大直径嵌岩桩承载性能研究

采用分布式光纤传感技术对赫章特大桥195 m主墩下的大直径嵌岩桩承载特性进行了系统的研究分析。首先采用室内模型试验验证了光纤技术在桩基测试中应用的可行性；然后通过现场埋设和施工过程中的数据采集、整理与分析，系统研究了大直径嵌岩桩的承载特性及其荷载传递机制；依托工程的实测变形量进一步证明了光纤测试技术的可行性和正确性。基于全分布式光纤传感技术的研究结果对大直径嵌岩桩理论及其工程应用具有参考价值，同时对光纤测试技术在桩基测试中的应用具有借鉴作用。

Research on bearing behaviors of large-diameter rock-socketed piles through distributed optical fiber sensing technology

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.