Abstract
The investigation of seabed consolidation under a breakwater is not available in previous literatures. In this study, taking the dynamic Biot's equation known as “u-p” approximation as the governing equation, a FEM program PORO-WSSI 2D is developed for the consolidation and dynamic response of porous medium. By adopting PORO-WSSI 2D, the consolidation of unsaturated seabed under a composite breakwater and hydrostatic pressure is investigated. The floating force acting on the bottom of caisson has been considered in numerical computation. The excess pore pressure dissipation, growth of effective stresses, settlement of breakwater and the shear stress concentration in seabed foundation all can be monitored. The developed FEM program provides coastal engineers with an effective analysis tool to predict the shear failure in seabed foundation.DOI: http://dx.doi.org/10.5755/j01.mech.18.4.2337
Highlights
Nowadays, more than two-thirds of the world's population is concentrated in the coastal zones, where the coastline generally is either the center of economic development, or the important port for transportation
In this study, taking the dynamic Biot’s equation as the governing equation, a finite element (FEM) program PORO-WSSI 2D is developed to investigate the consolidation of unsaturated porous seabed under a composite breakwater and hydrostatic water pressure
K 2 p wn where u, w are the soil displacements in the x, z directions, respectively; n is soil porosity; σ’x and σ’z are the effective normal stresses in the horizontal and vertical directions, respectively; τxz is the shear stress; p is the pore pressure in porous medium; ρ = nρf + (1 – n)ρs is the average density of porous medium; ρf is the fluid density; ρs is solid density; k is the Darcy's permeability; g is the gravitational acceleration and γw is the unit water weight. ε is the volumetric strain
Summary
More than two-thirds of the world's population is concentrated in the coastal zones, where the coastline generally is either the center of economic development, or the important port for transportation. A lot of investigations have been conducted on the offshore geotechnical mechanics These previous works mainly pay their attentions on the dynamic response of seabed under ocean wave loading, including the analytical solutions [3,4], and numerical simulations [5,6,7]. The initial displacements, pore pressure, velocity and acceleration in seabed foundation are all assumed as zero in these investigations This assumption is a negative factor for accurately evaluating the potential liquefaction and dynamic shear failure in seabed foundation under ocean wave loading. Little attention has been given to the application of these numerical methods proposed to determination of the consolidation status of large-scale seabed foundation under hydrostatic pressure and large-scale breakwater. In this study, taking the dynamic Biot’s equation as the governing equation, a finite element (FEM) program PORO-WSSI 2D is developed to investigate the consolidation of unsaturated porous seabed under a composite breakwater and hydrostatic water pressure
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