对武汉轨道交通动态直流干扰下的燃气管道的管地电位进行了24 h连续监测，对其干扰进行风险评估，并利用傅里叶变换对数据进行频域分析，统计了杂散电流干扰下管地电位波动的频率、分布、幅值等动态特征。结果表明：燃气管道处于高直流干扰风险区的有20处，低风险区域的有7处；受有轨电车干扰管地电位波动存在明显间歇性，一个间歇期为130~140 s，而地铁无明显间歇期；各轨道交通线路引起的波动频率不尽相同，但是50%以上的波动频率集中在0.005~0.03 Hz。

The pipe-to-soil potentials of the gas pipelines under the dynamic DC interference of Wuhan rail transit were continuously monitored for 24 h. The interference risk was evaluated and Fourier transform was used to analyze the data in frequency domain. The frequency, distribution, amplitude and other dynamic characteristics of pipe-to-soil potential fluctuation under the interference of stray current were analyzed. The results show that there were 20 points of gas pipelines in high DC interference risk zone and 7 points in low risk zone. The fluctuation of pipe-to-soil potentials under the interference of trams was intermittent, an entire intermittency period was 130-140 s, but it was not intermittent under the interference of metros. Though the fluctuation frequency caused by various rail transit lines was different, more than 50% fluctuation frequency was concentrated in 0.005-0.03 Hz.