Two-Dimensional Numerical Study of Seabed Response around a Buried Pipeline under Wave and Current Loading

Foo, Cynthia Su Xin; Liao, Chencong; Chen, Jin-Jian

doi:10.3390/jmse7030066

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…Numerical examples demonstrated the capacity of their new meshfree model in the prediction of the wave-induced soil response. Foo et al [7] adopted the FLOW-3D model together with poro-elastoplastic seabed model (within COMSOL) to examine the soil response around a fully buried pipeline under combined wave and current loading. They considered the residual soil response.…”

Section: Foundations Of Marine Infrastructuresmentioning

confidence: 99%

“…(2) evaluation of stability of marine infrastructures, including pipelines [6][7][8], piled foundation and bridge piers [9][10][11][12], submarine tunnel [13], and other supported foundations [14]; and (3) coastal geohazard, including submarine landslide and slope stability [15,16] and other geohazard issue [17,18]. More details of each contribution are summarized in the following subsections.…”

Section: Introductionmentioning

confidence: 99%

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Coastal Geohazard and Offshore Geotechnics

Jeng

Zhang

Kirca

2020

JMSE

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Section: Foundations Of Marine Infrastructuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coastal Geohazard and Offshore Geotechnics

Jeng

Zhang

Kirca

2020

JMSE

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“…The method is simple, which is suitable for the analysis of the oscillatory pore pressure response induced by waves acting on the sandy seabed. The second method is to apply Biot's poro-elastic theory for soil models to describe the pore pressure response [17][18][19][20][21]. Based on Biot's poro-elastic theory, Shen et al [22] first explored the pore-pressure response in the soil around the suction anchor under cyclic loading conditions, but this was limited to the sandy seabed.…”

Section: Introductionmentioning

confidence: 99%

Accumulation of Pore Pressure in a Soft Clay Seabed around a Suction Anchor Subjected to Cyclic Loads

Chen

et al. 2019

JMSE

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A suction anchor is an appealing anchoring solution for floating production. However, the possible effects of residual pore pressure can be rarely found any report so far in term of the research and design. In this study, the residual pore pressure distribution characteristics around the suction anchor subjected to vertical cyclic loads are investigated in a soft clay seabed, and a three-dimensional damage-dependent bounding surface model is also proposed. This model adopts the combined isotropic-kinematic hardening rule to achieve isotropic hardening and kinematic hardening of the boundary surface. The proposed model is validated against triaxial tests on anisotropically consolidated saturated clays and normally consolidated saturated clays. The analytical results show that the excess pore water pressure accumulates primarily on the outside of the suction anchor, whereas negative pore water pressure mainly on the inside. The maximum values of both sides appear in the lower part of the seabed. According to the distribution characteristics of the residual pore pressure, a perforated anchor is proposed to reduce the accumulation of excess pore water pressure. A comparative study generally shows that the perforated anchor can effectively reduce the accumulation of excess pore water pressure.

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“…These investigations have focused on the mechanism of the onset of scour [3,4], the equilibrium scour depth [5][6][7], the time scale of tunnel erosion [8][9][10], and field observations and tests [11,12]. Numerical simulation is also widely adopted in researches on the two-dimensional scour hole development process [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Visualization Tests on Variation of Scour Front under a Pipeline in Steady Currents

Xie

Zhu

2019

JMSE

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The intersection of the span shoulder and the scour hole under a pipeline, also called the scour front, can affect the scour hole extension rate and the bearing capacity of the span shoulder, which is associated with pipeline spanning and failure. Studies on scour front evolution are limited due to technical restrictions. In this study, visualization experiments on three-dimensional scour under a pipeline in steady currents were performed to reveal the evolution of the scour front at the beginning of scour process, and the parametric effects on the scour front pattern. The angle of scour front witnessed a steady drop at the start of the scour development process and fluctuated gently thereafter. This can be attributed to the decrease in the blockage effect over time. A gravitational movement was observed on the downstream end of the scour front, which is associated with the variation of fluid pressure along the scour front. The scour front pattern was described by the angle between the scour front and the streamwise direction. Parametric analysis showed that the averaged scour front angle climbs as the Froude number increases and the pipeline embedment drops. This phenomenon can be expounded by the intensified flow deflection near the span shoulder due to the enhancement of the pipeline blockage effect, caused by the ascending Froude number and descending pipeline embedment. The results of this study can be adopted in future mechanism investigations on the scour hole propagation rate and the failure analysis on the span shoulder.

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Two-Dimensional Numerical Study of Seabed Response around a Buried Pipeline under Wave and Current Loading

Cited by 9 publications

References 35 publications

Coastal Geohazard and Offshore Geotechnics

Coastal Geohazard and Offshore Geotechnics

Accumulation of Pore Pressure in a Soft Clay Seabed around a Suction Anchor Subjected to Cyclic Loads

Visualization Tests on Variation of Scour Front under a Pipeline in Steady Currents

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