Numerical modelling of liquefaction in loose sand deposits subjected to ocean waves

Zhao, Hongyi; Jeng, Dong‐Sheng; Liao, Chencong; Zhang, Jiachao; Guo, Zhen; Chen, W.-Y.

doi:10.1016/j.apor.2018.01.011

Cited by 10 publications

(4 citation statements)

References 36 publications

(68 reference statements)

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“…The primary focus is on time-matching schemes, nonmatching mesh strategies, and ensuring the continuity of the interface pressure. The one-way coupling technique has been utilized in previous studies for wave-seabed-structure interactions [50][51][52], yielding notable results in achieving a balance between computation cost and accuracy. Figure 2 provides the schematic representation of the one-way coupling process between the two models.…”

Section: Integration Of Sub-modelsmentioning

confidence: 99%

Numerical Modeling of Composite Load-Induced Seabed Response around a Suction Anchor

Ma,

Zhao,

Jeng

2024

JMSE

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Suction anchors play a crucial role as marine supporting infrastructure within mooring systems. In engineering practice, the composite load comprising nonlinear waves and cyclic pull-out loads can have adverse effects on the seabed soil, posing a threat to the pull-out bearing capacity of the suction anchor. While existing research predominantly focuses on cyclic pull-out loads, the influence of nonlinear wave actions at the seabed surface remains overlooked. This study employs a two-dimensional integrated numerical model to investigate the dynamic soil response around a suction anchor under the influence of both nonlinear waves and cyclic pull-out loads, focusing on the mechanisms that lead to liquefaction and the deterioration of the interfacial friction due to the excess pore pressure buildup. The numerical results reveal that the cyclic pull-out load is the primary factor in the deterioration of the frictional resistance at the suction–soil interface, especially when the pull-out load is inclined with the suction anchor. Parametric studies indicate that the relative difference in frictional resistance deterioration between cases considering and excluding surface water waves becomes more pronounced in soils characterized by a small consolidation coefficient (Cv) and relative density (Dr).

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Section: Integration Of Sub-modelsmentioning

confidence: 99%

Numerical Modeling of Composite Load-Induced Seabed Response around a Suction Anchor

Ma,

Zhao,

Jeng

2024

JMSE

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“…Based on Biot’s consolidation theory [ 2 ], several researchers have proposed analytical solutions for wave-induced pore pressure on both finite and infinite seabeds [ 3 , 4 ]. Over time, more complex conditions have been investigated, including multi-layered seabeds [ 5 ], cross-anisotropic soil behavior [ 6 ], non-homogenous seabeds [ 7 ], fully dynamic soil behavior [ 8 ], combined wave and current loadings [ 9 ], and, more recently, the spatial variability of soil properties [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Pore Pressure on Sandy Seabed around Submarine Pipeline under Irregular Wave Loading

Fu,

Wang,

Zhao

2024

Sensors

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The propagation of shallow-water waves may cause liquefaction of the seabed, thereby reducing its support capacity for pipelines and potentially leading to pipeline settlement or deformation. To ensure the stability of buried pipelines, it is crucial to consider the excess pore pressure induced by irregular waves thoroughly. This paper presents the findings of an experimental study on excess pore pressure caused by irregular waves on a sandy seabed. A series of two-dimensional wave flume experiments investigated the excess pore pressure generated by irregular waves. Based on the experimental results, this study examined the influences of irregular wave characteristics and pipeline proximity on excess pore pressure. Using test data, the signal analysis method was employed to categorize different modes of excess pore-water pressure growth into two types and explore the mechanism underlying pore pressure development under the influence of irregular waves.

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“…At present, there are three primary methods for assessing soil liquefaction: in-situ tests (Fergany and Omar, 2017), laboratory tests (Kumar et al, 2020), and numerical simulation (Ye et al, 2016;Zhao et al, 2018). These methods have been maturely applied in the study of liquefaction in sandy soils due to their safety and reliability (Amini and Qi, 2000;Dobry and Abdoun, 2017;Ye et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Assessing the liquefaction potential of seabed soils based on ocean ambient noise in the Yellow River Delta

Meng

Wang

et al. 2023

Front. Mar. Sci.

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Seabed soils can undergo liquefaction under cyclic loading, resulting in a rapid decrease in strength and stiffness, which may lead to the destruction of offshore structures. Therefore, the assessment of seabed soil liquefaction will become an important factor in disaster prevention and risk analysis in coastal and offshore engineering construction. In this study, the ocean ambient noise with low-frequency, long-wavelength, and wide-band characteristics was used to conduct and analysis noise based on the horizontal-to-vertical spectral ratio method. The shear wave velocity of the seabed soil was obtained by inverting the ocean ambient noise dataset. Then, we proposed a shear wave velocity threshold that can be used for liquefaction assessment of Holocene unconsolidated fine-grained soils by statistical analysis, and the liquefaction potential of the soils was evaluated according to 1-D shear wave velocity structures and 2-D shear wave velocity profiles. The results showed that the distribution of the shear wave velocity obtained by inverting ocean ambient noise was generally consistent with the measured shear wave velocity in the field, indicating that the inversion results have a certain degree of accuracy. A shear wave velocity threshold of 200 m/s was proposed for liquefaction assessment, determining that the soils within 0-10 m depth in the coastal area of Yellow River Delta have liquefaction potential. This result is in accordance with the assessment based on the critical shear wave velocity, indicating that this threshold is applicable to the assessment of seabed soil liquefaction in the Yellow River Delta. The in-situ observations of ocean ambient noise provide a more convenient, economical, and environmentally friendly method, which can help to investigate marine geology disasters and serve marine engineering construction.

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Numerical modelling of liquefaction in loose sand deposits subjected to ocean waves

Cited by 10 publications

References 36 publications

Numerical Modeling of Composite Load-Induced Seabed Response around a Suction Anchor

Numerical Modeling of Composite Load-Induced Seabed Response around a Suction Anchor

Experimental Investigation of Pore Pressure on Sandy Seabed around Submarine Pipeline under Irregular Wave Loading

Assessing the liquefaction potential of seabed soils based on ocean ambient noise in the Yellow River Delta

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