Interference Regularity of Metro Stray Current on Buried Pipelines

In recent years, with the rapid development of urban subways, buried pipelines near subways often suffer from dynamic DC interference, causing continuous fluctuations in the on potential of pipelines, which seriously affects the safe operation and daily management of pipelines. Field tests were carried out on a pipeline that was disturbed by the stray current of subway, and the interference law of the stray current of the subway on the buried pipeline was analyzed. The results showed that the subway operation had a great influence on the fluctuation of the on potential of the pipeline; the intensity of the disturbance of the subway stray current increased with the decrease of the distance from the pipeline to the subway line, and the pipeline section closer to the subway station had a higher corrosion risk. The different locations of the pipeline interfered by the stray current of the subway were inflow and outflow positions, and the inflow and outflow characteristics of the stray current at the same position would change with time.