海底管道后挖沟过程的应力解析分析方法

Analytical Stress Analysis Method for Submarine Pipeline during Trenching

海底管道在后挖沟过程中会产生较大的变形,此时管道内产生较大的应力,对管道安全的运行形成威胁。因此准确给出挖沟过程中管道应力计算方法具有重要意义。基于弹性梁理论,给出了挖沟过程中管道挠曲线微分方程,通过边界条件与协调方程,给出了考虑几何非线性的挖沟过程中管道应力与变形解析计算方法。通过与有限元数值模型对比得到本解析方法结果与数值方法结果基本一致,可以用于工程中海底管道的应力计算。

During the after trenching process, large deformation will occur in the pipe, which can induce large stress leading to the potentialfailure. Thus an accurate stress estimation method for pipelines under this load condition was necessary. Based on elastic beam theory, thepipe deflection equations were proposed. The analytical stress and deformation results were derived by the boundary conditions and the coordinationcondition between the geometrical elongation and the physical one. Finally, this proposed method was validated accuracy for calculatingpipe stress by comparing with a finite element model.