Wave-induced multi-layered seabed response around a buried pipeline

Zhou, Xi‐Lang; Jeng, Dong‐Sheng; Yan, Yu-guang; Wang, Jianhua

doi:10.1016/j.oceaneng.2013.06.031

Cited by 43 publications

(9 citation statements)

References 29 publications

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“…Both lateral boundaries of the seabed are considered to be impermeable without horizontal displacement or flow motion [11]:…”

Section: Experimental Conditions and Proceduresmentioning

confidence: 99%

“…Cheng and Liu [8] used a boundary integral equation method to investigate the effects of wave and seabed parameters on the uplift seepage force and pore pressure around a pipeline, that was buried in a rectangular region with impermeable walls. There were a number of numerical analyses considering the effects of a cover layer with full backfilled conditions on the wave-induced seabed dynamic response around a buried pipeline [9][10][11][12]. However, these models may not be able to predict the seabed response in the neighbourhood of a pipeline when a wave is propagating over a partially backfilled pipeline, as opposed to fully backfilled.…”

Section: Introductionmentioning

confidence: 99%

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Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Zhai

Zhao

et al. 2018

Applied Ocean Research

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The phenomenon of wave-seabed-pipeline interactions is one of the primary concerns of coastal engineers and researchers, as it could greatly affect the seabed instability and pipeline safety. Numerous researchers have expended great effort in studying wave-seabed-pipeline interactions in the past. However, the majority of them focussed on the wave-induced response around a submarine pipeline, in buried conditions, by numerical models and laboratory experiments. Unlike the previous studies, a series of regular wave experiments and numerical model analyses were conducted to investigate the wave-induced pore pressure in the sandy seabed, around a pipeline with different backfilled depths. The model pipeline with three diameters (D = 6 cm, 8 cm, and 10 cm) is buried in three sizes of sand, d50=0.15 mm, d 50 =0.3 mm, and d 50 =0.5 mm, with different backfilled depths. The results show that the pore pressure amplitude in the seabed is a minimum with a backfilled depth D, and a maximum with full backfill or a backfilled depth of zero. The pore-pressure amplitude increases as the backfill sand median diameter increases. The effects of the pipeline diameter on pore-water pressure are also analysed and discussed.

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“…Both lateral boundaries of the seabed are considered to be impermeable without horizontal displacement or flow motion [11]:…”

Section: Experimental Conditions and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Zhai

Zhao

et al. 2018

Applied Ocean Research

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“…When the vertical effective stress becomes zero, instantaneous liquefaction will happen. The phenomenon of instantaneous liquefaction in the porous seabed under ocean waves has been widely discussed [21,22,34]. Jeng [35] reviewed and compared three existing criteria of liquefaction, indicating that the two criteria based on the concept of effective normal stresses are not adequate in the examined cases.…”

Section: Instantaneous Liquefaction Of the Seabedmentioning

confidence: 99%

Effect of vertical seismic motion on the dynamic response and instantaneous liquefaction in a two-layer porous seabed

Chen

Wang

Chen

et al. 2018

Computers and Geotechnics

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The evaluation of seismic-induced response in the porous seabed is a fundamental problem in geotechnical and coastal engineering. Although the ground motions generally include both horizontal and vertical components, most previous theoretical investigations assumed vertically propagating shear waves in a horizontally layered soil-rock system and simply ignored the effect of site response to vertical earthquake motion. In this paper, the dynamic response and instantaneous liquefaction of porous seabed, induced by vertical earthquake loading, is studied using an analytical method. The seabed is treated as a two-layer poro-elastic medium and characterized by the fully dynamic formulation of Biot theory. The analytical solutions for the response variables, such as induced displacement, pore pressure and vertical effective stress, are respectively derived and the mechanism of instantaneous liquefaction in the liquefiable sediment is investigated based on the excess pore pressure criterion. A set of parametric analysis is carried out to discuss the effects of seawater, seabed and earthquake parameters on the seismic response and maximum liquefaction depth. It is worth noting that the properties of surface seabed layer have significant influence on the seismic response and consequently the potential stability of the seabed, which is important in the analysis of foundations for offshore structures.

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“…Later, the effect of nonlinear wave as well as soil-pipeline contact effects on pipeline dynamics were studied [12][13][14]. Recently, the dynamics of a pipeline buried in a single-layer or multi-layer seabed applied by conodal wave or linear wave were studied by Zhou et al [15] and Zhou et al [16]. Previous studies were basically limited to two dimensions.…”

Section: Introductionmentioning

confidence: 99%

Seismic Dynamics of Pipeline Buried in Dense Seabed Foundation

Zhang

et al. 2019

JMSE

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Submarine pipeline is a type of important infrastructure in petroleum industry used for transporting crude oil or natural gas. However, submarine pipelines constructed in high seismic intensity zones are vulnerable of attacks from seismic waves. It is important and meaningful in engineering design to comprehensively understand the seismic wave-induced dynamics characteristics of submarine pipelines. In this study, taking the coupled numerical model FSSI-CAS 2D as the tool, the seismic dynamics of a submarine steel pipeline buried in dense soil is investigated. Computational results indicate that submarine pipeline buried in dense seabed soil strongly responds to seismic wave. The peak acceleration could be double of that of input seismic wave. There is no residual pore pressure in the dense seabed. Significant resonance of the pipeline is observed in horizontal direction. Comparative study shows that the lateral boundary condition which can avoid wave reflection on it, such as laminar boundary and absorbing boundary should be used for seabed foundation domain in computation. Finally, it is proven that the coupled numerical model FSSI-CAS 2D is applicable to evaluate the seismic dynamics of submarine pipeline.

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Wave-induced multi-layered seabed response around a buried pipeline

Cited by 43 publications

References 29 publications

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Physical Model of wave-induced seabed response around trenched pipeline in sandy seabed

Effect of vertical seismic motion on the dynamic response and instantaneous liquefaction in a two-layer porous seabed

Seismic Dynamics of Pipeline Buried in Dense Seabed Foundation

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