Distribution of the Stray Current of Rebar in the Ballast Bed
Corresponding prevention strategies can be put forward by learning the stray current distribution in the metro rebar. In the paper, the stray current intensity of the rebar in the ballast of the power supply area and the 24-hour polarization potential of the rebar in the ballast are obtained through the test of vertical resistance, track-current drainage net resistance and track-earth resistance, and the polarization potential test in the tunnel ballast of metro system in service. The daily leak of the stray current of the rebar in the ballast is also obtained based on the relationship between the polarization potential and current intensity. The test result shows that the vertical resistance of the track has quite good consistency while the track-current drainage net resistance and track-earth resistance have relatively great discreteness. The polarization potential peak of the rebar in the ballast is over 500mV and the 24-hour equivalent and average current intensity of the rebar in the ballast can rise up to 0.26~0.43A/dm2.
Chunliang Zhang and Paul P. Lin
Z. J. Dong et al., "Distribution of the Stray Current of Rebar in the Ballast Bed", Applied Mechanics and Materials, Vols. 226-228, pp. 2147-2153, 2012