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Wave-induced stresses and pore pressures near a mudline

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Author(s): Andrzej Sawicki | Ryszard Staroszczyk

Journal: Oceanologia
ISSN 0078-3234

Volume: 50;
Issue: 4;
Start page: 539;
Date: 2008;
Original page

Keywords: {Seabed mechanics | Pore water pressures | Elasto-plasticity | Coulomb-Mohr yield condition

ABSTRACT
Conventional methods for the determination of water-wave induced stresses inseabeds composed of granular soils are based on Biot-type models, in which the soilskeleton is treated as an elastic medium. Such methods predict effective stressesin the soil that are unacceptable from the physical point of view, as they permittensile stresses to occur near the upper surface of the seabed. Therefore, in thispaper the granular soil is assumed to behave as an elastic-ideally plastic material,with the Coulomb-Mohr yield criterion adopted to bound admissible stress states inthe seabed. The governing equations are solved numerically by a~finite differencemethod. The results of simulations, carried out for the case of time-harmonicwater waves, illustrate the depth distributions of the excess pore pressures and theeffective stresses in the seabed, and show the shapes of zones of soil in the plastic state.~In particular, the effects on the seabed behaviour of suchparameters as the degree of pore water saturation, the soil permeability, and theearth pressure coefficient, are illustrated.