TY - JOUR
T1 - Transient wave-induced pore-water-pressure and soil responses in a shallow unsaturated poroelastic seabed
AU - Tong, Linlong
AU - Liu, Philip L.F.
N1 - Funding Information:
L.L.T. is funded by the National Postdoctoral Program for Innovative Talents of China (BX20190105), the Major International Joint Research Project POW3M (51920105013), the Fundamental Research Funds for the Central Universities (B200202062) and the National Natural Science Foundation of China (52101309). P.L.-F.L. would like to acknowledge support from the Faculty of Engineering at the National University of Singapore through an initiative grant. This research was also supported in part by the Yushan Fellow Program, Ministry of Education, Taiwan.
Publisher Copyright:
© The Author(s), 2022. Published by Cambridge University Press.
PY - 2022/5/10
Y1 - 2022/5/10
N2 - An analytical solution is developed for studying transient water wave-induced responses inside an unsaturated poroelastic seabed of finite thickness. The soil skeleton and the pore fluid are compressible and the constitutive relationship of the soil skeleton is described by Hooke's law. Assuming that the horizontal length scale of wave motion is much larger than the seabed thickness, the leading-order analytical solutions for the seabed responses, including pore fluid pressure and soil skeleton motion, are obtained. The present solutions are suitable for general transient wave loading and for the shear modulus of the soil skeleton being of the same order of magnitude as the effective bulk modulus of elasticity of the pore fluid. The present theory is first validated by checking the solutions with the experimental data for the pore pressure induced by periodic-wave loading. The present analytical solutions are then used to investigate the seabed responses under transient waves, including linear periodic wave, a solitary wave and a bore. The effects of the wave-induced effective stresses on the bed failure potential are further analysed. The results show that the shear failure potential and its duration are highly dependent on the soil properties, such as saturation degree, shear modulus and permeability. Sensitivity analyses are presented.
AB - An analytical solution is developed for studying transient water wave-induced responses inside an unsaturated poroelastic seabed of finite thickness. The soil skeleton and the pore fluid are compressible and the constitutive relationship of the soil skeleton is described by Hooke's law. Assuming that the horizontal length scale of wave motion is much larger than the seabed thickness, the leading-order analytical solutions for the seabed responses, including pore fluid pressure and soil skeleton motion, are obtained. The present solutions are suitable for general transient wave loading and for the shear modulus of the soil skeleton being of the same order of magnitude as the effective bulk modulus of elasticity of the pore fluid. The present theory is first validated by checking the solutions with the experimental data for the pore pressure induced by periodic-wave loading. The present analytical solutions are then used to investigate the seabed responses under transient waves, including linear periodic wave, a solitary wave and a bore. The effects of the wave-induced effective stresses on the bed failure potential are further analysed. The results show that the shear failure potential and its duration are highly dependent on the soil properties, such as saturation degree, shear modulus and permeability. Sensitivity analyses are presented.
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U2 - 10.1017/jfm.2022.184
DO - 10.1017/jfm.2022.184
M3 - Article
AN - SCOPUS:85127917700
SN - 0022-1120
VL - 938
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
M1 - A36
ER -