Abstract:Seismic-induced pore water pressure and effective stresses in the saturated porous seabed under seismic loading are the main factors that govern the overall stability of submarine pipelines. In most of the previous investigations of dynamic response of seabed,the pipeline is taken as to be rigid and generally the interaction between seabed and pipeline is overlooked. The equivalent disposal of seabed boundary also has not been taken into consideration. Therefore,the model of the seabed-pipeline interaction is established based on the Biot¢s theory of consolidation. The distribution of the seismic-induced pore water pressure along the pipeline outer surface and the dynamic response of submarine pipeline along the pipeline inner and outer surface under El Centro seismic wave are studied with ADINA. The effects of variable pipeline radius and pipeline wall thickness,variable soil modulus and soil permeability on the seismic-induced pore water pressure and internal stresses of submarine pipeline are discussed. Through numerical analysis,viscoelastic artificial boundary is taken into account to simulate the transmission of seismic wave from finite region to infinite region effectively. It actually shows the validity and accuracy of dynamic response of submarine pipeline under seismic loading.