Analysis of seismic time-history effect of single corroded pipeline in seasonally frozen soil region

Abstract

Based on the pipe-soil thermal-solid coupling analysis method, the single corrosion defect pipeline, insulation layer and seasonally frozen soil were taken as the research object in this paper. Under the specific working conditions of differential frost heave, the seismic time history seismic time history effects were analyzed. The study focused on the axial and vertical velocity responses at the center of the corroded zone of buried pipelines with different corrosion defect characteristics, and then their variations were summarized. The result indicates that the corrosion depth has a greater influence on the axial velocity response than the vertical velocity response. Moreover, the corrosion depth has a larger impact on the maximum vertical and axial displacements at the center of the corroded zone than the corrosion length. The response sensitivity of the corrosion depth to vibratory loading is twice that of the length. When the corrosion length is fixed, the maximum growth rate of axial strain in the corroded zone typically occurs at a corrosion depth ratio between 50% and 75%. Additionally, when the same peak ground motion is considered for pipelines in the same type of site, different seismic wave spectra have significant effects on the dynamic response of buried defective pipelines.