Abstract
This paper deals with the wave-induced cyclic response of a poro-elastic seabed (by means of oscillations of the pore-fluid pressure, soil displacement, effective normal stress and shear stress in a soil skeleton) due to a surface sinusoidal water-wave propagating over a seabed of finite thickness. The main existing analytical solutions to the governing problem, assuming a dual-elastic system of the two-phase (pore-fluid and soil skeleton) seabed medium, are critically discussed, pointing out their limitations, doubtful items, and meaningful errors. The amplitude phenomena is particularly studied as an immanent part of any complex-valued analytical solution of a cyclic nature. A series of calculation analyses, performed for the North Sea wave and soil conditions, has indicated problematic results as far as high values of the shear modulus of soil are concerned. An application of meaningfully different values of the degree of saturation, obtained for one and the same calculation example, has caused many additional doubts as to the quality of the tested analytical solutions.