Numerical Modeling of Wave-Induced Liquefaction around Pipelines

Dunn, Scott; Vun, P. L.; Chan, A. H. C.; Damgaard, Jesper

doi:10.1061/(asce)0733-950x(2006)132:4(276)

Cited by 75 publications

(27 citation statements)

References 13 publications

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“…The presence of the pipeline was found to have significant influence on the pore pressure buildup, particularly on the bottom of the pipe. Dunn et al [15] presented a numerical study on the same process, which answered some questions raised in the physical simulations of Sumer et al [34]. In summary, recent studies have contributed to advancing the understanding of liquefaction around marine structures, but more research is needed, particularly in the near-shore region, where critical structures and ports are located.…”

Section: Previous Work On Wave-seabed Interactionsmentioning

confidence: 89%

“…The MC model cannot capture the necessary volumetric compaction in order to model this process. See, for example, Sassa and Sekiguchi [30], Dunn et al [15], and Ou et al [28] for the numerical studies of this cyclic liquefaction behavior using more sophisticated elastoplastic models. In the current study, however, the primary liquefaction mechanism is instantaneous rather than cyclic.…”

Section: Subsurface Pore Water Pressure Simulatormentioning

confidence: 99%

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Liquefaction potential of coastal slopes induced by solitary waves

et al. 2009

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Tsunami runup and drawdown can cause liquefaction failure of coastal fine sand slopes due to the generation of high excess pore pressure and the reduction of the effective over burden pressure during the drawdown. The region immediately seaward of the initial shoreline is the most susceptible to tsunami-induced liquefaction failure because the water level drops significantly below the still water level during the set down phase of the drawdown. The objective of this work is to develop and validate a numerical model to assess the potential for tsunamiinduced liquefaction failure of coastal sandy slopes. The transient pressure distribution acting on the slope due to wave runup and drawdown is computed by solving for the hybrid Boussinesq-nonlinear shallow water equations using a finite volume method. The subsurface pore water pressure and deformation fields are solved simultaneously using a finite element method. Two different soil constitutive models have been examined: a linear elastic model and a non-associative Mohr-Coulomb model. The numerical methods are validated by comparing the results with analytical models, and with experimental measurements from a large-scale laboratory study of breaking solitary waves over a planar fine sand beach. Good comparisons were observed from both the analytical and experimental validation studies. Numerical case studies are shown for a full-scale simulation of a 10-m solitary wave over a 1:15 and 1:5 sloped fine sand beach. The results show that the soil near the bed surface, particularly along the seepage face, is at risk to liquefaction failure. The depth of the seepage face increases and the width of the seepage face decreases with increasing bed slope. The rate of bed surface loading and unloading due to wave runup and drawdown, respectively, also increases with increasing bed slope. Consequently, the case with the steeper slope is more susceptible to liquefaction failure due to the higher hydraulic gradient. The analysis also suggests that the results are strongly influenced by the soil permeability and relative compressibility between the pore fluid and solid skeleton, and that a coupled solid/fluid formulation is needed for the soil solver. Finally, the results show the drawdown pore pressure response is strongly influenced by nonlinear material behavior for the full-scale simulation.

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Section: Previous Work On Wave-seabed Interactionsmentioning

confidence: 89%

Section: Subsurface Pore Water Pressure Simulatormentioning

confidence: 99%

Liquefaction potential of coastal slopes induced by solitary waves

et al. 2009

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“…Only a few studies can be found in Dunn et al [4], Li and Jeng [9], and Liu et al [10]. One of the best known researches in this topic was the finite element simulation conducted by Sassa and Sekiguchi [14].…”

Section: Introductionmentioning

confidence: 99%

Effects of principal stress rotation on the wave–seabed interactions

Wang

Yang

2016

Acta Geotech.

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This paper simulates the wave-seabed interactions considering the principal stress rotation (PSR) by using the finite element method. The soil model is developed within the framework of kinematic hardening and the bounding surface concept, and it can properly consider the impact of PSR by treating the PSR generating stress rate independently. The simulation results are compared with centrifuge test results. The comparison indicates that the simulation with the soil model considering the PSR can better reproduce the test results on the development of pore water pressure and liquefaction than the soil model without considering the PSR. It indicates that it is important to consider the PSR impact in simulation of wave-seabed soil interactions.

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“…Soil stresses, in relations (8) to (13), can be substituted into the equilibrium equations (5) to (7). This provides a system of partial differential equations for soil equilibrium in terms of soil displacements and the pore pressure:…”

Section: Governing Equationsmentioning

confidence: 99%

“…Numerous studies have concentrated on the evaluation of seabed responses under wave loading [5][6][7]. However, the majority of them considered a two-dimensional wave-soilpipeline interaction problem.…”

Section: Introductionmentioning

confidence: 99%

3D Modeling of Wave-Seabed-Pipeline in Marine Environments

Shabani¹,

Jeng²

2008

TOCIEJ

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Abstract:In this study, a three-dimensional numerical model is developed, based on the Finite Element Method, to analyse the behaviour of soil under the wave loading. The pipeline is assumed to be rigid and anchored within a trench. The influence of wave obliquity on seabed responses, the pore pressure and soil stresses, are studied, which cannot be handled by the existing 2D models. It is revealed that three-dimensional characteristics systematically affect the distribution of soil response around the circumference of the underwater pipeline. Based on new 3D model, the effects of wave and soil characteristics and trench configuration on the wave-induced seabed instability are discussed in detail.

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Numerical Modeling of Wave-Induced Liquefaction around Pipelines

Cited by 75 publications

References 13 publications

Liquefaction potential of coastal slopes induced by solitary waves

Liquefaction potential of coastal slopes induced by solitary waves

Effects of principal stress rotation on the wave–seabed interactions

3D Modeling of Wave-Seabed-Pipeline in Marine Environments

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