采用试片法及数据记录仪等测试方法对受地铁直流干扰影响管道进行了专项调查; 并测试了管道长时间的通/断电电位。结果表明, 在0~64 km的管段(两端有绝缘接头)受到直流杂散电流干扰严重, 管道在白天的极化电位正向偏移超过标准的要求, 需要进行直流杂散电流排流。距地铁64~130 km的管段(绝缘接头之后)也受到直流杂散电流干扰, 但影响较小。

In order to study the interference distance and severity of subway DC interference on pipeline cathodic protection, a special investigation was conducted using coupon test and data logger. Long term on/off potentials of pipeline were also monitored . The results showed that severe DC stray current interference was found at 0-64 km pipeline section with insulation connectors on both sides. Drainage measures should be taken as the trend of positive excursion of polarized potential at daytime exceeded the threshold of related standard. The other section at 64-130 km after insulation connector also suffered mild DC stray current interference, but not servere enough to take measures.