滑坡下成品油管道力学响应研究

针对于管道横穿滑坡体存在的潜在危害，基于光滑粒子流体动力学与有限元耦合算法（SPH-FEM）构建土-管-油完全耦合模型，综合考虑材料、几何及接触非线性，分析土-管-油作用机制，并探讨滑坡体位移、埋深及径厚比等主要因素对管道力学行为的影响。研究表明，相比于简化为内压的油管（存在内压的空管），当考虑管内成品油存在时，均存在滑坡作用下管道典型的损伤行为，但在满管输送工况下，管内成品油的作用由滑坡初始时刻的“抗变”转变为“助变”，且对管道位移形变产生更大的影响，与简化空管相比，其位移增加了10.63%（应力增加了4.96%）；随滑坡体位移、滑坡规模的增大及埋深的减小（对于敷设于滑坡中部的管道），会产生更大位移及塑性形变区域；对于穿越滑坡区的管道，可适量增加壁厚以增强管道极限承载能力。研究所得成果可为保障管道安全运行及滑坡灾害下管道防护给予理论指导与技术支持。

A Study on Mechanical Response of Product Oil Pipeline under Landslide

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.