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In this paper, we presented an integrated numerical model fo r the wave-induced residual liquefaction around a buried offshore pipeline. In the present model, unlike previous investigations, two new features were added in the present model: (i) new definition o f the source term fo r the residual pore pressure generations was proposed and extended from ID to 2D; (ii) preconsolidation due to self-weight o f the pipeline was considered. The present model was validated by comparing with the previous experimental data fo r the cases without a pipeline and with a buried pipeline. Based on the numerical model, first, we examined the effects o f seabed, wave and pipeline characteristics on the pore pressure accumulations and residual liquefaction. The numerical results indicated a pipe with a deeper buried depth within the seabed with larger consolidation coefficient and relative density can reduce the risk o f liquefaction around a pipeline. Second, we investi gated the effects o f a trench layer on the wave-induced seabed response. It is found that the geometry o f the trench layer (thickness and width), as well as the backfill materials (permeability K and relative density Dr) have significant effect on the development o f liquefaction zone around the buried pipeline. Furthermore, under certain conditions, par tially backfill the trench layer up to one pipeline diameter is sufficient to protect the pipe lines from the wave-induced liquefaction.

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