Abstract：The evaluation of wave-induced excess pore water pressure and effective stresses are recognized as an important factor in the design of submarine pipelines. In most previous investigations for the seabed-pipeline interaction，the effect of pipeline on dynamic response of seabed has been usually ignored；and nonslip condition is mainly assumed at the interface between pipeline and seabed soils. The effect of full interaction between seabed and pipeline has not been considered in the analyses of stresses and deformations of the seabed and submarine pipeline. Furthermore，the inertia effects of both accelerations of seafloor soils and pipeline on response of seabed have not been taken into account in most previous investigations. The governing equations of the seabed and pipeline are formulated respectively based on the Biot¢s theory of dynamic consolidation of two-phase media and principle of elastic dynamics. The seabed-pipeline interaction problem is investigated by using the friction contact theory；and numerical formulations based on FEM are established. Based on the computed results，it is found that the soil-pipeline interaction plays an important role in effect stresses of the seabed around pipeline；and the wave-induced excess pore water pressure along the pipeline surface is significantly affected by the shape of the trench layer in the vicinity of the bottom of the pipeline.
