Study of Factors Affecting Lateral Buckling of Deep-Sea Sandwich Pipe Under Nonuniform Temperature Field
Deep-sea high-pressure and low-temperature environments increasingly highlight the overall buckling phenomenon of submarine pipelines,in which the effects of fluid flow state,initial defects of pipelines and pipe-soil friction on the overall buckling of submarine pipelines are particularly significant.In view of the non-uniform temperature distribution of the pipeline and the high-pressure environment in the deep sea,a finite element model is established to analyze the overall buckling of the sandwich pipe under the non-uniform temperature field.The displacement configurations and force states of each layer of the sandwich pipe in the buckling deformation process under the two types of fluid flow patterns are investigated,and the influences of the pipeline defects and the pipe-soil friction on the buckling characteristics of the pipeline are analyzed.Calculation results show that:in the process of buckling of the sandwich pipe,the inner pipe and the sandwich layer are axially compressed by thermal expansion,and the outer pipe is axially tensile by forced deformation.The overall stress of the sandwich pipe under turbulent flow condition is larger than that of the laminar flow.The lateral displacement and axial displacement of the pipeline decrease with the increase of axial friction coefficient and increase with the growth of defect amplitude,while the increase decreases rapidly after the defect amplitude reaches 1.2 m.The critical buckling temperature of the pipeline is positively correlated with the defect amplitude but negatively correlated with the pipe-soil friction coefficient.A larger defect amplitude leads to the pipeline's maximum stress entering the plastic stage earlier.
deep-sea sandwich pipenon-uniform temperature fieldlateral bucklinginitial defect
万方数据
维普
