Ocean waves propagating over a porous seabed: Residual and oscillatory mechanisms

Jeng, Dong‐Sheng; Seymour, Brian; Gao, Fu‐Ping; Wu, Ying

doi:10.1007/s11431-007-2018-5

Cited by 20 publications

(21 citation statements)

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“…As such, soil scour (general and local scour) should be taken into account when evaluating the foundation instability [31]. In the shallow waters, the waves and currents are always coexisting; the wave-induced soil liquefaction [115] would be coupled with the local scouring process, which further complicates the failure mechanism of foundations.…”

Section: Discussionmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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As the offshore engineering moving from shallow to deep waters, the foundation types for fixed and floating platforms have been gradually evolving to minimize engineering costs and structural risks in the harsh offshore environments. Particular focus of this paper is on the foundation instability and its failure mechanisms as well as the relevant theory advances for the prevailing foundation types in both shallow and deep water depths. Piles, spudcans, gravity bases, suction caissons, and plate anchors are detailed in this paper. The failure phenomena and mechanisms for each type of foundations are identified and summarized, respectively. The theoretical approaches along with sophisticated empirical solutions for the bearing capacity problems are then presented. The major challenges are from flow-structure-soil coupling processes, rigorous constitutive modeling of cyclic behaviors of marine sediments, and the spatial variability of soil properties for large-spreading structures. Further researches are suggested to reveal the instability mechanisms for underpinning the evolution of offshore foundations. Citation:Gao F P, Li J H, Qi W G, et al. On the instability of offshore foundations: theory and mechanism.

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Section: Discussionmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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“…They found that the accumulated pore pressure and liquefaction were important for large waves and became apparent with increases in the relative water depth (d/L) and wave steepness (H/L). In this article, the soil in the seabed was sand, and the permeability was much larger than it was in the Jeng et al (2007) study. Also, the water depth was not greater than 20 m in liquefied cases, and the steepness of most waves (H/L) was small.…”

Section: Introductionmentioning

confidence: 73%

“…It generally increases at the initial period of wave loading until accumulating to a certain value at which it primarily remains. Jeng et al (2007) analyzed the effects of residual mechanism on pore pressure and liquefaction in the seabed by analytical methods. They found that the accumulated pore pressure and liquefaction were important for large waves and became apparent with increases in the relative water depth (d/L) and wave steepness (H/L).…”

Section: Introductionmentioning

confidence: 99%

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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“…Jeng et al [8] discussed two mechanisms for wave-induced pore pressures in a porous seabed, i.e., oscillatory, residual excess pore pressures, and an analytical solution for the waveinduced residual pore pressure was derived. Using the residual pore-pressure analytical solution [8], the process of wave-induced soil erosion was investigated. Then, the parametric studies were In this paper, a three-phase soil model (soil skeleton, pore fluid, and fluidized soil particles) was established to study the soil erosion process induced by waves in the silty sand seabed.…”

Section: Introductionmentioning

confidence: 99%

“…COMSOL Multiphysics is a kind of finite element method (FEM) software which is developed by COMSOL INC found in Stockholm, Sweden. Jeng et al [8] discussed two mechanisms for wave-induced pore pressures in a porous seabed, i.e., oscillatory, residual excess pore pressures, and an analytical solution for the wave-induced residual pore pressure was derived. Using the residual pore-pressure analytical solution [8], the process of wave-induced soil erosion was investigated.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

Guo

Zhou

Zhu

et al. 2019

JMSE

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Silty sand is a kind of typical marine sediment that is widely distributed in the offshore areas of East China. It has been found that under continuous actions of wave pressure, a mass of fine particles will gradually rise up to the surface of silty sand seabeds, i.e., the phenomenon called wave-induced soil erosion. This is thought to be due to the seepage flow caused by the pore-pressure accumulation within the seabed. In this paper, a kind of three-phase soil model (soil skeleton, pore fluid, and fluidized soil particles) is established to simulate the process of wave-induced soil erosion. In the simulations, the analytical solution for wave-induced pore-pressure accumulation was used, and Darcy flow law, mass conservation, and generation equations were coupled. Then, the time characteristics of wave-induced soil erosion in the seabed were studied, especially for the effects of wave height, wave period, and critical concentration of fluidized particles. It can be concluded that the most significant soil erosion under wave actions appears at the shallow seabed. With the increases of wave height and critical concentration of fluidized particles, the soil erosion rate and erosion degree increase obviously, and there exists a particular wave period that will lead to the most severe and the fastest rate of soil erosion in the seabed.

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Ocean waves propagating over a porous seabed: Residual and oscillatory mechanisms

Cited by 20 publications

References 10 publications

On the instability of offshore foundations: theory and mechanism

On the instability of offshore foundations: theory and mechanism

Response of Layered Seabed under Wave and Current Loading

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

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