成品油管道的极限悬空长度研究

长输管道沿线地质地貌错综复杂，自然条件恶劣，外界载荷（如地质滑坡、坍塌、疏松土壤沉降、湿陷性黄土、地震、水毁等）导致大跨度悬空，轻则引起管道大变形，大面积悬空、局部变形或应力集中，而导致较大的位移应力、屈曲或蠕变，严重时甚至导致管道断裂破坏，给管道运营带来安全隐患。针对2010 年兰成渝输油管道德阳石亭江段洪水导致管线大面积悬空案例，以物理数学方法中的非线性理论为指导，通过有限元仿真建模及试验研究，借助大挠度梁理论、弹性地基理论、管–土互作用双线性模型、Winkler 假定等力学理论，考虑管道的几何非线性和土壤的物理非线性，建立了悬空管道的大变形分析模型，分析计算了X52 管材的极限悬空长度，为管道完整性管理提供理论基础。

Maximum Suspended Length of Production Pipeline

The external load(such as geology landslide,collapse,loose soil deposition,collapsible loess,earthquakes,water damage,etc.)caused by complex geological features and poor natural conditions along long-distance the pipeline will result in a large span of vacancy of the pipeline.Slightly inciting the large deformation of the pipeline,a large area of vacancy,the local deformation or stress concentration,resulting in greater displacement and stress,buckling or creep,or even badly cause pipeline rupture,producing pipeline safety hazards.We establish suspended pipeline model in this paper,calculate maximum suspended length of X52 refined oil pipeline by using the theory of elastic foundation,large deflection beam theory,pipeline soil interaction,Winkler presumption model and considering the geometric nonlinearity and soil physical nonlinearity on the basis of Lan-Cheng-Yu,Deyang,Shijiangting oil pipeline large area suspended for flood water.