An analytical solution for wave-induced seabed response in a multi-layered poro-elastic seabed

Zhou, Xi‐Lang; Xu, Bin; Wang, Jianhua; Li, Yaoliang

doi:10.1016/j.oceaneng.2010.10.003

Cited by 47 publications

(15 citation statements)

References 35 publications

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“…Building on the earlier research of Hsu, Jeng, and Lee (1995), Jeng (2001) analyzed a seabed with multiple layers and derived the liquefied zone for a variety of cases and discussed the protection of the seabed in detail. Zhou et al (2011) extended the seabed to more than three layers and found some meaningful results. Nevertheless, the literature mentioned above only took into account wave loading, and the effects of current were ignored.…”

Section: Introductionmentioning

confidence: 92%

Response of Layered Seabed under Wave and Current Loading

Feng

Wang

2015

Journal of Coastal Research

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Wen, F. and Wang, J.H., 0000. Response of layered seabed under wave and current loading. Journal of Coastal Research, 00(0), 000-000. Coconut Creek (Florida), ISSN 0749-0208.Wave and other environmental loadings in the ocean are the main factors affecting seabed stability and the safety of marine structures. Most previous literature has considered seabed response in a layered seabed under wave loading or in a single soil layer only under combined wave and current loading. In this article, a two-layered seabed, subjected to combined wave and current loading, is considered. The influence of currents on the stratified seabed response is investigated initially. The results indicate that a following current will aggravate the instability of the seabed, either in the form of liquefaction or shear failure. The effects of stratification on the seabed response were also studied. Numerical results reveal that upper layer of the seabed will become more stable as the permeability ratio (k 1 : k 2 ) increases, where k 1 and k 2 are the permeability of upper and lower layer of the seabed, respectively. The thickness of each layer of the seabed also affects its stability. For example, the upper layer is apt to be more unstable when the thickness of the lower layer of the seabed (h 2 ) is equal to about one-fifth of the wave length (L/5). Analysis of the seabed reformation in relation to engineering practice shows that replacing or adding a layer onto the original seabed can both prevent liquefaction effectively, and the approach of adding a layer has the better potential to prevent liquefaction, but those treatments have a lesser effect on the maximum depth of shear failure in the original seabed.ADDITIONAL INDEX WORDS: Porous seabed, wave and current interaction, liquefaction, shear failure, seabed protection.

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Section: Introductionmentioning

confidence: 92%

Response of Layered Seabed under Wave and Current Loading

Feng

Wang

2015

Journal of Coastal Research

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“…While considering the nonlinearity of the distribution of seabed parameters, Zhou et al [37] studied the wave-induced seabed response around a pipeline buried in a multilayered seabed and the numerical results showed that pore pressure generation and liquefaction were significantly affected by the permeability of the multilayered seabed. However, the investigations that treated the vertical heterogeneous seabed as a multilayered seabed medium are valid only for uniform materials in each sublayer [38][39][40][41]. In addition, the boundary conditions used at the interface of two sublayers lead to discontinuity in some seabed responses, such as horizontal effective normal stresses, which is inconsistent with the fact that the seabed response varies continuously with depth in a natural seabed.…”

Section: Introductionmentioning

confidence: 99%

Wave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed

Chen

Jeng

Liao

et al. 2019

JMSE

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Cofferdams are frequently used to assist in the construction of offshore structures that are built on a natural non-homogeneous anisotropic seabed. In this study, a three-dimensional (3D) integrated numerical model consisting of a wave submodel and seabed submodel was adopted to investigate the wave–structure–seabed interaction. Reynolds-Averaged Navier–Stokes (RANS) equations were employed to simulate the wave-induced fluid motion and Biot’s poroelastic theory was adopted to control the wave-induced seabed response. The present model was validated with available laboratory experimental data and previous analytical results. The hydrodynamic process and seabed response around the dumbbell cofferdam are discussed in detail, with particular attention paid to the influence of the depth functions of the permeability K i and shear modulus G j . Numerical results indicate that to avoid the misestimation of the liquefaction depth, a steady-state analysis should be carried out prior to the transient seabed response analysis to first determine the equilibrium state caused by seabed consolidation. The depth function G j markedly affects the vertical distribution of the pore pressure and the seabed liquefaction around the dumbbell cofferdam. The depth function K i has a mild effect on the vertical distribution of the pore pressure within a coarse sand seabed, with the influence concentrated in the range defined by 0.1 times the seabed thickness above and below the embedded depth. The depth function K i has little effect on seabed liquefaction. In addition, the traditional assumption that treats the seabed parameters as constants may result in the overestimation of the seabed liquefaction depth and the liquefaction area around the cofferdam will be miscalculated if consolidation is not considered. Moreover, parametric studies reveal that the shear modulus at the seabed surface G z 0 has a significant influence on the vertical distribution of the pore pressure. However, the effect of the permeability at the seabed surface K z 0 on the vertical distribution of the pore pressure is mainly concentrated on the seabed above the embedded depth in front and to the side of the cofferdam. Furthermore, the amplitude of pore pressure decreases as Poisson’s ratio μ s increases.

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“…Among these ( Zhou et al 2010;2011;Jeng and Seymour 1997;Thomas 1989;Raman-Nair and Sabin 1991), analytical, numerical and experimental studies have been used to investigate the wave-induced liquefaction potential. The response of porous seabed is usually formulated in the frame work of the theory proposed by Biot(1941), who then extended them to include dynamics (Biot 1956;1962).…”

Section: Introductionmentioning

confidence: 99%

Wave-Induced Response of Submarine Pipeline Embedded in Porous Seabed

Zhou¹,

Zhang²,

Yan³

et al. 2014

Soil Behavior and Geomechanics

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Submarine pipeline have been used extensively to transport natural oil and gas. The design of pipeline is a challenge for coastal engineers. In the past decades, many researches had focused particularly on solving wave-induced pipeline instability problem. However, this problem has not been fully understood because of the complicated soil behavior. It has been well known that when water waves propagate over a porous seabed, the dynamic pressure on the sea floor fluctuates with the passing waves. Such fluctuations induce variations of the pore pressure and effective stress within the marine sediments, and cause the deformation or even failure of the seabed skeleton. Wave-induced pore pressure and resultant liquefaction in a porous seabed has been recognized as a key factor for pipeline failure.To explore the mechanism of the pipeline instability, the partly dynamic (u-p) for the wave-induced response of the seabed is adopted. In partly dynamic analysis, the u-p formulation in which both displacement and pore pressure are the field variables, is adopted considering the acceleration of soil skeleton. A parametric study is carried out and the resulting response from the partly dynamic are presented for various representative seabed and wave parameters.

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An analytical solution for wave-induced seabed response in a multi-layered poro-elastic seabed

Cited by 47 publications

References 35 publications

Response of Layered Seabed under Wave and Current Loading

Response of Layered Seabed under Wave and Current Loading

Wave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed

Wave-Induced Response of Submarine Pipeline Embedded in Porous Seabed

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