Seismic time history effect analysis of axial double corroded pipeline in seasonal frozen soil area
For the problem of seismic performance of buried double-corrosion-containing pipeline in permafrost area,by taking double-corrosion-containing pipeline,insulation layer and seasonal permafrost area soil as the research object,it was proposed to impose the viscoelastic boundary condition around the soil body to ensure the accuracy and reasonableness of the model,and analyze the mechanical properties of the pipeline containing different corrosion parameters under the action of differential freezing expansion and seismic wave.The results show that:With the increase of corrosion length and corrosion depth,the peak axial strain at the R1 point changes,the change of corrosion length makes the maximum change of the peak value at the R1 point increase from-0.005 4 to-0.001 75,which is increased by 0.003 65,and the change of corrosion depth makes the maximum change of the peak value at the R1 point decrease from 0.002 14 to-0.005 4,which is increased by 0.007 54;Compared with the corrosion length,the corrosion depth has a greater effect on the von Mises equivalent stress and axial strain at the center of the corrosion zone;There is still interaction between the double corrosion in the process of seismic wave action,and the increase of corrosion spacing will reduce the interaction between the corrosion,and the von Mises equivalent stress at the point of R1 exceeds the permissible stress at the points of R2 and R3 to form a damage first.Different seismic waves acting at the corrosion defects caused by the ring-breaking form is different;Using the von Mises equivalent stress exceeding the reference stress as the pipeline safety evaluation criteria is on safety side.This study can provide some theoretical references for the safety evaluation of buried double corrosion pipelines in permafrost area under seismic wave action.
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