A non-Darcy flow model for a non-cohesive seabed involving wave-induced instantaneous liquefaction

Zhou, Mingchao; Qi, Wen-Gang; Jeng, Dong‐Sheng; Gao, Fuping

doi:10.1016/j.oceaneng.2021.109807

Cited by 8 publications

(10 citation statements)

References 87 publications

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“…The equations described above are shown in Figure 2 in the wz z v i space, which appears as the non-Darcy flow model. After discretization, linearization, and other derivation steps (the specific derivation process has been provided by Zhou [63] and is omitted here), the finite element formulation using the non-Darcy flow model is obtained as follows:…”

Section: Numerical Implementation Of the Non-darcy Flow Modelmentioning

confidence: 99%

“…, After discretization, linearization, and other derivation steps (the specific derivation process has been provided by Zhou [63] and is omitted here), the finite element formulation using the non-Darcy flow model is obtained as follows:…”

Section: Onset Of Liquefactionmentioning

confidence: 99%

“…Recently, Zhou et al [63] proposed a new KKT condition for wave-induced instantaneous liquefaction through the variational equivalence principle; thus, a non-Darcy flow model was proposed for instantaneous liquefaction. This model not only eliminates the phenomenon of tensile stress in the liquefied zone but also provides significant convenience for numerical implementations, because only the formulation of a seepage constitutive equation is required to be incorporated into finite element codes.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we further took into account a pipeline fully buried in a non-cohesive seabed under wave loadings in order to investigate wave-seabed-structure interactions with the use of our non-Darcy flow model [63]. First, we extended our previous finite element code to a scenario that can consider a structure fully buried in the seabed.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Wave-Induced Instantaneous Liquefaction of a Non-Cohesive Seabed around Buried Pipelines: A Liquefaction-Associated Non-Darcy Flow Model Approach

Han,

Zhou,

Zhang

et al. 2024

JMSE

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In complex marine environments, the wave-induced instantaneous liquefaction of the seabed is a key issue for the long-term safety control of marine structures. Existing computational frameworks for instantaneous liquefaction result in unreasonable tensile stresses in a non-cohesive seabed. To address this issue, a liquefaction-associated non-Darcy flow model has been proposed, but it has only been applied to the scenario of a pure seabed without a structure. In this study, we applied the previously proposed non-Darcy flow model to investigate the mechanism of wave–seabed–structure interactions under extreme wave loading considering a pipeline fully buried in a non-cohesive seabed. By comparing the liquefaction depths in the presence and absence of structures, it was found that the existence of structures weakens the attenuation of the pore pressure amplitude and influences the overall pore pressure distribution. Parametric studies were conducted. It was found that the liquefaction depth from the non-Darcy model is approximately 0.73 times that from the traditional Darcy model, regardless of whether or not a pipeline is involved. A quantitative relationship between the wave loading and structural size was established. The liquefied zone above the buried pipeline was found to be smaller than that in a pure seabed without a structure. A tentative explanation is provided for this phenomenon.

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Section: Numerical Implementation Of the Non-darcy Flow Modelmentioning

confidence: 99%

Section: Onset Of Liquefactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wave-Induced Instantaneous Liquefaction of a Non-Cohesive Seabed around Buried Pipelines: A Liquefaction-Associated Non-Darcy Flow Model Approach

Han,

Zhou,

Zhang

et al. 2024

JMSE

View full text Add to dashboard Cite

show abstract

“…In the natural near‐shore environment, waves often coexist with currents, which can induce excess pore pressure in the porous marine sediments and weaken the stability of the seabed. The dynamic interaction of waves, currents, and the seabed has been considered critical in the studies of sediment transport and local scour (e.g., Anderson et al., 2017; Li, Ong, Fuhrman, & Larsen, 2020; Qi & Gao, 2014), seabed liquefaction (e.g., Klammler et al., 2021; Li, Ong, & Tang, 2020; Zhou, Liu, et al., 2021; Zhou, Qi, et al., 2021), and instability of offshore foundations (e.g., Cuéllar et al., 2012; De Groot et al., 2006; Oumeraci, 1994). Nevertheless, existing laboratory experiments for combined wave‐current induced pore pressure have been limited to small wave periods, and most previous theoretical research did not consider the wave‐current coupling effects adequately.…”

Section: Introductionmentioning

confidence: 99%