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管道在实际运行过程中常常受到因沉降变形导致的外部载荷作用,而已有的管道失效评估标准与方法大多局限于内压对管体的影响。针对油气管道悬空沉降变形问题采用力学模型、有限元分析、开挖试验等方法进行了系统研究,模拟了无缺陷和含缺陷悬空管道的应力分布,结果表明,缺陷在管道底部时等效应力最大。通过开挖试验获得了最大应力点的应力变化等试验数据,验证了有限元方法用于工程实践的可行性,指出在实际工程评估中尚需考虑缺陷位置、土质等因素的影响。
Pipelines are often subjected to external loads due to settlement and deformation during actual operation. Most of the existing pipe failure assessment standards and methods are limited to the influence of internal pressure on the pipe body. Aiming at the problem of floating settlement deformation of oil and gas pipelines, the mechanical model, finite element analysis and excavation test are used to systematically study the stress distribution of the pipeline with defects and defects. The results show that the maximum equivalent stress . Through the excavation test, the experimental data such as the stress change of the maximum stress point were obtained. The feasibility of using the finite element method for the engineering practice was verified. The influence of the location of the defect and the soil quality was also considered in the actual project evaluation.