Predicting impact forces on pipelines from deep-sea fluidized slides: A comprehensive review of key factors

Guo, Xingsen; Fan, Ning; Zheng, Defeng; Fu, Cuiwei; Wu, Hao; Zhang, Yanjun; Song, Xiaolong; Nian, Tingkai

doi:10.1016/j.ijmst.2024.02.001

Cited by 21 publications

(8 citation statements)

References 91 publications

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“…Waves are one of the most common marine environmental loads acting on floating bodies [38,39]. In the experiment, the whole model is towed in waves, producing the current-wave load.…”

Section: Coupling Effects Of Wave Loadmentioning

confidence: 99%

Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves

Yu,

Zhang,

Zhang

2024

JMSE

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In order to investigate the effects of the top-end dynamic boundary of risers caused by floater motions on their vortex-induced vibration (VIV) characteristics, a combined model comprising a buoyancy can with a relatively simple structural form and a riser is taken as the research object in the present study. The aspect ratios of the buoyancy can and the riser model are 5.37 and 250, respectively. A set of experimental devices is designed to support the VIV test of the riser with a dynamic boundary stimulating the vortex-induced motion (VIM) of the buoyancy can under different uniform flow and regular wave conditions. Several data processing methods are applied in the model test, i.e., mode superposition, Euler angle conversion, band pass filter, fast Fourier transform, and wavelet transform. Based on the testing results, the effect of low-frequency VIM on the high-frequency VIV of the riser is discussed in relation to a single current, a single wave, and a combined wave and current. It is found that the coupling effect of VIM on the riser VIV presents certain orthogonal features at low current velocities. The effect of the cross-flow VIM component on VIV is far more prominent than that of its counterpart, the in-line VIM, with increasing flow velocity. The VIM in the combined wave–current condition significantly enhances the modulation of vibration amplitude and frequency, resulting in larger fluctuation peaks of vibration response and further increasing the risk of VIV fatigue.

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“…Waves are one of the most common marine environmental loads acting on floating bodies [38,39]. In the experiment, the whole model is towed in waves, producing the current-wave load.…”

Section: Coupling Effects Of Wave Loadmentioning

confidence: 99%

Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves

Yu,

Zhang,

Zhang

2024

JMSE

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“…However, failure of the composite bucket foundation often occurs due to large displacements and excessive pore pressures when subjected to severe storm wave loads. Guo et al [13][14][15][16] have conducted a comprehensive study about severe storm wave loads. Guo et al [13][14][15][16] have conducted a comprehensive study about the structure and pipelines in the seabed.…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al [13][14][15][16] have conducted a comprehensive study about severe storm wave loads. Guo et al [13][14][15][16] have conducted a comprehensive study about the structure and pipelines in the seabed. Therefore, understanding the performance of composite bucket foundation breakwater under storm wave loading conditions becomes considerably crucial for its design and construction in practice.…”

Section: Introductionmentioning

confidence: 99%

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Centrifuge Modelling of Composite Bucket Foundation Breakwater in Clay under Monotonic and Cyclic Loads

Jiang,

Lu,

Cai

et al. 2024

JMSE

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This study investigates the monotonic and cyclic performance of composite bucket foundation breakwater in clay through centrifuge modeling. The application of monotonic loads simulates extreme wave conditions, and cyclic load corresponds to long-term serviceability conditions. In centrifuge tests, three typical soil strengths were tested, and two load eccentricities were simulated to check the influence of wave force height. Multiple measurements were conducted, including rotation angle, horizontal displacement, vertical settlement, and pore pressure variation. When soil strength increases in monotonic centrifuge tests, the ultimate bearing capacity of the bucket foundation experiences significant growth, and the foundation failure pattern varies. In responding to the monotonic test, the foundation’s rotation center constantly moved downward during the loading process, indicating that the deeper soil would be activated to resist the horizontal loading. In contrast, the rotation center movement in the symmetric centrifuge test was opposed to the non-symmetric test because the deeper soil was required to provide resistance to balance the more severe load under the non-symmetric loading condition. It should be noted that non-symmetric loading does not impact the bucket foundation as seriously as symmetric loading. The utilization of deep-soil resistance in non-symmetric tests is beneficial in controlling deformation.

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“…The distribution of soft soils, which have physical and mechanical properties such as high water content, high thixotropy, low strength, and low permeability, is very common in deep-sea areas, according to survey and analysis results (Nian et al, 2018;Huang et al, 2021). Deep-sea soft soils are highly susceptible to destabilization and sliding due to external disturbances (Ren et al, 2018a;Fan et al, 2023;Guo et al, 2023b;Guo et al, 2024), especially for cyclic loading disturbances with high frequencies and load levels (usually caused by frequent seaquakes or earthquakes; for example, Figure 1 shows the seismic distribution situation around the Pacific Ocean). The low permeability of deep-sea soft soils results in the inability of water to drain out of the soils (i.e., in the undrained state) under cyclic loading, which generates excess pore water pressure and reduces the strength and bearing capacity of deep-sea seabed soils, threatening the safety and stability of deep-sea engineering structures (Andersen, 2009).…”

Section: Introductionmentioning

confidence: 99%

An undrained dynamic strain-pore pressure model for deep-water soft clays from the South China Sea

Jiao,

Guo,

Fan

et al. 2024

Front. Mar. Sci.

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With the increasing use of oceans for engineering purposes, such as the installation of suction anchors and pipelines, the stability of seabed structures has become a pivotal concern and is intricately linked to the characteristics of seabed soils. This study focuses specifically on deep-sea soft clay, a predominant seabed soil type distinguished by its high water content, thixotropy, and low permeability. These clays are vulnerable to destabilization and damage when disturbed, thereby posing threats to seabed installations. While the existing literature extensively examines the cyclic behavior of clay, considering factors such as the pore pressure response and strain and deformation characteristics, there is a notable gap in research addressing the behavior of deep-sea soft clay under comprehensive stress levels and prolonged cyclic loading. In this study, cyclic shear tests of the natural marine clay of the South China Sea were conducted, and the cyclic stress ratio (CSR), overpressure consolidation ratio (OCR), consolidation ratio (Kc), and loading frequency were varied. It was found that the CSR, OCR, and Kc significantly impact the cumulative dynamic strain in deep-sea soft clay during undrained cyclic dynamic tests. Higher CSR values lead to increased dynamic strain and structural failure risk. Subsequently, a dynamic strain-dynamic pore pressure development model was proposed. This model effectively captures the cumulative plastic deformation and dynamic pore pressure development, showing correlations with the CSR, OCR, and Kc, thus providing insights into the deformation and pore pressure trends in deep-sea clay under high cyclic dynamic loading conditions. This research not only furnishes essential background information but also addresses a critical gap in understanding the behavior of deep-sea soft clay under cyclic loading, thereby enhancing the safety and stability of seabed structures.

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Predicting impact forces on pipelines from deep-sea fluidized slides: A comprehensive review of key factors

Cited by 21 publications

References 91 publications

Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves

Coupling Effects of a Top-Hinged Buoyancy Can on the Vortex-Induced Vibration of a Riser Model in Currents and Waves

Centrifuge Modelling of Composite Bucket Foundation Breakwater in Clay under Monotonic and Cyclic Loads

An undrained dynamic strain-pore pressure model for deep-water soft clays from the South China Sea

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