Distribution of the Stray Current of Rebar in the Ballast Bed
Corresponding prevention strategies can be put forward by leaming 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.
stray current ballast bed polarization potential
DONG Zhi Jun LI Xiao Yi YAN Peiyu XING Feng
Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Department of Shenzhen Metro Group Company Limited Shenzhen 518026,China Guangdong Provincial Key Laboratory of Durability for Civil Engineering Shenzhen University,Shenzhen
国际会议
上海
英文
2147-2153
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）