Abstract
Effects of the embedded monopile foundation on the local distributions of pore water pressure, soil stresses, and liquefaction are investigated in this study using a three-dimensional integrated numerical model. The model is based on a Reynolds-Averaged Navier-Stokes wave module and a fully dynamic poroelastic seabed module and has been validated with the analytical solution and experimental data. Results show that, compared to the situation without an embedded foundation, the embedded monopile foundation increases and decreases the maximum pore water pressure in the seabed around and below the foundation, respectively. The embedded monopile foundation also significantly modifies the distributions of the maximum effective soil stress around the foundation and causes a local concentration of soil stress below the two lower corners of foundation. A parametric study reveals that the effects of embedded monopile foundation on pore water pressure increase as the degrees of saturation and soil permeability decrease. The embedded monopile foundation tends to decrease the liquefaction depth around the structure, and this effect is relatively more obvious for greater degrees of saturation, greater soil permeabilities, and smaller wave heights.
Highlights
Monopile is a common structure used in ocean engineering, underneath which the porous seabed stability is a great concern for the structure safety [1, 2]
Based on Reynolds-Averaged Navier-Stokes (RANS) equations and poroelastic seabed equations, a 3D integrated model was developed by Zhao et al [5] to investigate wave-induced seabed response around breakwater heads, in Mathematical Problems in Engineering which the seabed module was developed within COMSOL environment
A 3D RANS wave model is integrated with a 3D fully dynamic poroelastic seabed model to investigate the effects of an embedded monopile foundation on the local distributions of pore water pressure, soil stresses, and liquefaction zone, under wave reflection and diffraction around a monopile
Summary
Monopile is a common structure used in ocean engineering, underneath which the porous seabed stability is a great concern for the structure safety [1, 2]. Based on Reynolds-Averaged Navier-Stokes (RANS) equations and poroelastic seabed equations, a 3D integrated model was developed by Zhao et al [5] to investigate wave-induced seabed response around breakwater heads, in Mathematical Problems in Engineering which the seabed module was developed within COMSOL environment This model was applied by Chang and Jeng [6] to simulate the wave-seabed-structure interaction around the high-rising offshore wind turbine foundation used in the Donghai offshore wind farm, China. A 3D RANS wave model is integrated with a 3D fully dynamic poroelastic seabed model to investigate the effects of an embedded monopile foundation on the local distributions of pore water pressure, soil stresses, and liquefaction zone, under wave reflection and diffraction around a monopile. The significance of these effects with respect to various embedded depths and soil parameters is discussed
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