Limit displacement of a landslide for an X80 buried pipeline crossing it

When transporting natural gas, long-distance pipelines will inevitably pass through areas with frequent geological disasters, and landslides are the most threatening to pipelines. Therefore, it is very important to study the safety assessment of pipelines under the action of landslides. In view of the possible safety problems of X80 pipeline crossing the landslide, the definition of the limit landslide displacement of the pipeline is proposed as an external index to evaluate the safety of the pipeline. According to the working condition of a landslide on the Zhongwei Guiyang line, the pipe soil model under the landslide is established by using ABAQUS software, and the mechanical behavior of the pipeline and the change of the limit landslide displacement under different landslide cracks and landslide widths are numerically simulated. The results show that the pipeline stress increases with the increase of displacement load under different crack positions and landslide widths; The farther the landslide crack location is from the pipeline, the greater the limit landslide displacement that the pipeline can bear. When the crack location is 9 m, the limit landslide displacement that the pipeline can bear reaches 4.03 m; Under the working condition of this paper, the landslide width of 35 m is the dividing point of pipeline stress change. At this time, the limit landslide displacement that the pipeline can withstand is the smallest.