A Study on Mechanical Response of Product Oil Pipeline under Landslide

doi:10.11885/j.issn.1674-5086.2020.12.04.02

Abstract

Abstract: In view of the potential hazards of pipeline crossing the landslide, a fully coupled soil-pipeline-oil model is established based on Smooth Particle Hydrodynamics and Finite Element coupling algorithm (SPH-FEM), considering material, geometry and contact nonlinearity, the action mechanism of soil-pipeline-oil is analyzed, and the influence of landslide displacement, buried depth and diameter-thickness ratio on pipeline physical behavior is discussed. According to the working conditions, the results show that, compared to a oil pipeline simplified to internal pressure (an empty pipeline with internal pressure), when considering the presence of product oil in the pipeline, all of them show typical damage behavior under the action of landslide. However, under the full pipeline transportation condition, the action of the product oil in the pipe changes from " anti-deformation" at the initial moment of landslide to " assisting deformation", and has a greater impact on the displacement and deformation of the pipe body. Compared with the simplified empty pipeline, its displacement increased by 10.63% (stress increased by 4.96%). With the displacement of landslide, the increase of landslide scale and the decrease of buried depth of pipeline (for the pipeline laid in the center of landslide), greater displacement and plastic deformation area will be generated. For the pipeline crossing the landslide area, the wall thickness can be appropriately increased to enhance the ultimate bearing capacity of the pipeline. The research results can provide theoretical guidance and technical support for pipeline safety operation and pipeline protection under landslide disaster.

Key words: landslide, product oil pipeline, mechanical response, SPH-FEM coupling algorithm, finite element analysis

CLC Number:

TE973

JIANG Hongye, LAN Xubin, WANG Jinrong, HU Haiyang, WANG Tao. A Study on Mechanical Response of Product Oil Pipeline under Landslide[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 71-83.

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