Mechanical Behavior of Pipeline Under Uneven Circular Slide on Slope
There is no model that can accurately describe the mechanical behavior of pipelines under 3D une-ven circular slide on slopes.Based on the strength reduction theory,a 2D plane strain finite element model was used to determine the destabilizing sliding plane of the slope.Then,based on the slope sliding trajectory of the 2D plane strain finite element model,the landslide displacement function characterized by nonuniform trigonometric function was introduced to build a 3D finite element model containing the real sliding plane of the landslide.Final-ly,based on the project case background and parameter range of the Myanmar-China Oil and Gas Pipeline,the in-fluences of 8 dimensionless factors on the axial tensile strain behavior of the pipeline were fully analyzed.The re-sults show that the measures such as reducing buried depth,increasing wall thickness,designing pipeline crossing slope position based on diameter to thickness ratio and reasonably controlling the mechanical properties of backfill can greatly reduce the possibility of axial failure of pipelines.By means of controlling the wall thickness of pipe-lines,the influence of internal friction angle of soil and operating internal pressure can be effectively reduced.The study conclusions provide theoretical guidance for the design of pipelines laid through slope sections.
pipe layercircular landslidenumerical modelmechanical behavior of pipelineinfluential factortensile strain
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