ANALYSIS OF PIPE/SOIL INTERACTION ON ELASTIC-PLASTIC SEABED

The on-bottom stability of submarine pipelines is the key problem of submarine pipeline design. In order to offer the theoretical basis for the pipe/soil interaction, the large-scale general finite element program ABAQUS is adopted to analyze the pipe/soil interaction. The dynamic Ramberg-Osgood elastic-plastic model is adopted to simulate the soil. The computation is executed via changing the parameters of the pipe's subweights, environmental loadings and so on. The computational results show that the lateral soil mounding is in accordance with test results. The pipe's subweights and environmental loadings affect the pipeline's stability to a certain degree. A criterion for pipeline's lateral instability is established.