Cyclic Movement Behavior of Shallowly-Embedded Offshore Pipeline on Carbonate Seabed

摘要

A non-linear finite element analysis for a pipe-seabed interaction problembased on an effective stress theory was carried out in order to investigatethe stability of a shallowly-embedded offshore pipeline on thecarbonate sandy soil under the hydrodynamic environment. Pipelinemovement behavior during cyclic loadings due to both drag and liftforces caused by waves and currents was numerically simulatedthrough some carbonate soil conditions, the cyclic horizontal and verticalloadings under constant vertical loading. Pipeline movement behaviorgreatly depends on the carbonate soil conditions, the amplitude ofvertical loading, and the cyclic rotation behavior of pipeline.