基于传感光纤技术的堤坝分布式变形监测

堤坝变形是分析评价堤坝工作特性和安全的重要指标。设计了堤坝内部二维分布式变形一体化监测的分布式光纤监测技术的辅助结构型式与传感光纤布设方法，基于原型堤坝，通过系统试验测试验证了堤坝内部变形分布式监测新技术测量精度并论证其可行性，测试结果与实测结果吻合，二维变形测量的绝对误差最大为4.3 mm，堤坝内部二维变形测量精度达到毫米级，且实现了堤坝全断面内部二维变形分布式监测，证明了基于分布式光纤技术的土质堤坝内部二维分布式变形一体化监测新技术的适用性和先进性。

Fibre-optical distributed monitor on the deformation of embankment

Deformation is a key indicator for analyzing the characteristics and evaluating the safety of embankment. In this research, the installation method of sensing fiber equipped with an auxiliary structure was designed for the distributed monitoring of embankment’s internal two-dimensional deformation. A distributed monitoring test was conducted on a prototype embankment and the test result of its internal deformation validated the measurement accuracy and feasibility of the distributed monitoring technology as the maximum absolute error between the test result and the actual measured result of the embankment’s two-dimensional deformation was 4.3 mm; and mm-level measurement accuracy was realized not only for the internal two-dimensional deformation at certain points, but also for the whole section of the embankment, which proves the applicability and advancement of the fibre-optical distributed monitoring technology of the two-dimensional deformation inside the embankment.