Abstract: Through the solitary wave-sloping seabed-submarine pipeline coupling model, the pore water pressure response, stress and displacements of submarine pipelines around the buried pipelines in shallow coastal areas under solitary waves are studied. The Navier-Stokes equations considering k-ε turbulence are used to simulate the break, rise and fall of solitary waves on the gentle slope of the seabed. The surface pressure of the gentle slope is calculated. Based on the Biot consolidation equation, the slope model under the wave pressure is established. Based on the linear elasticity theory, the pipeline model is established by partial differential equation. The pore water pressure response characteristics, stress and deformation of the buried pipe seabed soil are calculated and analyzed. Compared with the test data and analytic solutions in literatures, the accuracy of analytical method and the model is verified. By using the validated numerical model, the pore water pressure response and the vertical effective stress response of soil around the embankment on gentle slope seabed under the action of solitary waves are calculated. The vertical force and displacement deformation of the pipelines are also calculated. The results show that, during the solitary wave run-down phase, the pore pressure around the pipelines buried near the coastline of the slope descends obviously, and the pipelines go up greatly. Compared with the situation of buried horizontal seabed and slope foot, the stress and displacement of the pipelines are the most unfavorable here. Besides, pipeline depth, soil parameters and the break, rise and fall of wave have a significant impact on the calculation results.

Key words: slope; seabed; solitary wave; submarine pipeline; coupling model