DOI: 10.11648/j.ajce.20261404.16 ISSN: 2330-8737

Dynamic Interference Simulation and Evaluation of Stray Current from Subway on Buried Pipeline

Jinhua Li, Zhiguang Chen, Ruihan Liu, Jianguo Feng, Chaokui Qin
Show PDF Cite
To evaluate the interference level of dynamic stray currents from urban rail transit on adjacent buried steel gas pipelines, this paper establishes a two-dimensional resistive network model of subway-soil-pipeline-earth based on bilateral power supply and bidirectional train operation conditions. First, the soil distribution resistance parameters in the track-to-pipeline zone were determined. Second, this model was used to investigate the influence patterns of track resistance, drainage network resistance, train operating position, train interval, and traction substation grounding mode on the pipe-to-ground potential. The model's validity was verified using actual potential monitoring data from gas pipelines adjacent to subway lines. Results indicate that when track resistance increases to 10 times the standard limit (0.01 Ω/km), the maximum positive/negative pipe-to-ground potential deviation rises by approximately 0.4 V. Higher drainage network resistance reduces its ability to collect stray current. When trains pass 500 m and 1500 m away, the maximum positive pipe potential deviation reaches 0.422 V. Different departure intervals for up and down trains cause superposition and cancellation effects in potential waveforms. Interference is minimal during simultaneous departures, peaking at 90 s intervals. Among traction substation grounding configurations, floating grounding causes the least pipeline interference, followed by bilateral direct grounding, with unilateral direct grounding causing the most severe interference. Field measurement data closely aligns with simulation results and consistent trends, validating the model's effectiveness. This study guides the prediction of stray current interference and optimizes the pipeline protection scheme design.

More from our Archive