Effect of Landslide on Stress of Defective Gas Pipeline

X80 pipeline steel was taken as a research object, and the gas pipeline model with corrosion defects under the action of lateral landslide was established by ABAQUS finite element analysis software. The effects of the five engineering factors including landslide displacement, pipeline internal pressure, axial defect position, circumferential defect position and defect depth on the stress of X80 pipeline steel were studied. And safety assessment of the pipeline was conducted. The results show that with the increase of landslide displacement, pipeline internal pressure and defect depth, the maximum equivalent stress of pipeline increased. The farther the defect from the center of the pipeline was, the smaller the maximum equivalent stress was, and the greater the effect of landslide displacement on the maximum equivalent stress was. When defects were in different circumferential directions, the maximum equivalent stress of pipeline was also different. When the defect depth exceeded a certain range, with the increase of internal pressure, the effect of defect depth exceeded that of internal pipeline pressure on maximum equivalent stress of pipeline. Failure pressure evaluation of pipeline with defects in landslide area using stress-based failure criteria cannot completely determine whether the pipeline is safe or not. It is suggested to use stress-based failure criteria for pipeline defects, and use strain-based failure criteria for secondary evaluation.