Abstract
Dynamic stray current leads to severe electrochemical corrosion on rock bolt in large cross-section subway tunnel. It’s important to evaluate the corrosion risk of corroded rock bolt based on monitoring signal. In this paper, an experiment for half-cell potential measurement of rock bolt under dynamic stray current interference was carried out. Tested non-stationary half-cell potential signal was analyzed the dynamic characteristics of half-cell potential in time and frequency domain. Herein, two parameters: potential shift ΔE and time ratio rt, were put forward to capture the characteristics of half-cell potential signal. A probabilistic-based analysis method was therefore proposed to quantify the corrosion risk of non-stationary half-cell potential, in which PDF of potential shift signal was fitted by generalized extreme value (GEV) function and kernel density estimation (KDE) technique. It is found that location parameter μ in GEV and the sum of the absolute values of the PDF derivative Sd could effectively represent potential shift and time ratio in half-cell potential signal respectively.
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