土质滑坡段航油管道的受力变形特征与防护措施

Stress deformation characteristics and protection measures of aviation oil pipeline in soil landslide section

为掌握土质滑坡作用下航油管道的动力响应规律,基于有限元与光滑粒子流体动力学(FEM-SPH)耦合方法,通过有限元软件ANSYS/LS-DYNA建立管道横坡及顺坡敷设的全尺寸模型,考虑管道-土体-航油的多物理场耦合效应,分析了管道不同敷设情况下的力学规律,并结合滑坡灾害防护措施,对比了防护前后管道受力情况。研究得出:顺坡敷设管体最大等效应力为166 MPa,位于管道上表面部位,管体呈S形曲线变化,横坡敷设管体最大等效应力位于管道与山体交接边缘,管体呈马鞍状曲线变化,最大等效应力为376 MPa,位于管道与山体交界处,管道发生塑性变形;相较于无防护措施,联合防护措施下的管道最大应力减小了57.5%,仅发生弹性变形。结果表明,横坡敷设更易受损,采取联合防护措施能有效降低其受损程度,与实际工程情况相符。该研究为滑坡管道灾害防控提供了理论依据。

To master the dynamic response law of aviation oil pipelines under the action of soil landslides,based on the coupling method of finite element and smooth particle fluid dynamics(FEM-SPH),a full-scale model of pipeline cross slope and slope laying was established using finite element software ANSYS/LS-DYNA.The multi physical field coupling effect of pipeline,soil mass and aviation oil was considered,and the mechanical laws of pipelines under different laying conditions were analyzed.And the stress situation of pipelines before and after protection was compared in combination with landslide disaster prevention measures.It is concluded through study that the maximum equivalent stress of the pipeline laid along the slope is 166MPa,located on the upper surface of the pipeline;the pipe body shows an S-shaped curve variation.The maximum equivalent stress of the pipeline laid on a cross slope is located at the edge of the intersection between the pipeline and the mountain,and the pipeline changes in a“saddle shaped”curve.The maximum equivalent stress is 376MPa,located at the junction of the pipeline and the mountain,and the pipeline undergoes plastic deformation.Compared to the pipeline without protective measures,the maximum stress of the pipeline under combined protective measures decreases by 57.5%,only elastic deformation occurs.The results indicate that for cross slope laying,the pipeline is more prone to damage,and adopting joint protective measures can effectively reduce its degree of damage,which is consistent with the actual engineering situation.The research provides a theoretical basis for the prevention and control of pipeline landslide disasters.