Suspension Identification on Buried Pipeline based on Distributed Strain Monitoring

Due to foundation defects or pipeline leakage,buried pipelines are prone to be partially suspended. The development of suspended pipelines will not only threaten the safe operation of pipelines,but also cause geological hazards,such as ground subsidence and collapse. Therefore,a suspension identification method of buried pipelines based on distributed strain monitoring is proposed. Firstly,distributed strain sensors are deployed to obtain longitudinal strain distribution along the pipeline,and then the bending strain is calculated and the suspended state of the pipeline is judged. Moreover. a finite element model of the buried pipeline is established based on pipe bending strains,and the soil stiffness of the finite element model is updated using genetic algorithm. Finally,the position and range of pipeline suspension are quantitatively identified according to the modified soil stiffness. The model test results show that the maximum error between the identification result and the positions of the slope should