Vector form intrinsic finite element analysis of deepwater J-laying pipelines on sloping seabed

Xu, Peng; Du, Zhixin; Zhang, Ting; Chen, Baochun

doi:10.1016/j.oceaneng.2022.110709

Cited by 16 publications

(8 citation statements)

References 28 publications

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“…The responses of a sloping seabed to seismic or seawater wave loads are different from the responses of horizontal seabeds and need to be specifically studied. This issue has attracted increased interest in recent years in various applications, including studies on slope stability (Feng and Price 14 ; Dou et al 15 ), pipelines (Xu et al 16 ; Seyfipour and Walker 17 ; and Rafiei et al 18 ), breakwaters (Zhao and Jeng 19 ; Ni and Teng 20 ), and small marine structures (Rafiei et al 21 ). All of these studies focused on the seawater wave-induced responses of seabeds and structures.…”

Section: Introductionmentioning

confidence: 99%

An analytical solution for the dynamic response of a seawater‐sloping seabed‐bedrock system under an oblique incident P wave

Shan

Xie

Dong

et al. 2023

Num Anal Meth Geomechanics

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Many offshore marine structures are built on seabeds with slight or considerable slopes, while most analytical studies have focused on the dynamic responses of horizontal seabeds. Based on the theory of porous media, an analytical solution for the response of a sloping seabed to earthquakes is developed in this paper. Stress and displacement responses can be shown at any location of the seabed.Using numerical examples, we analyze the influence of the slope angle, frequency and angle of incident waves, and thicknesses of the seawater and sediment layers on the dynamic response of the seabed. The results show that the solid displacement amplification factor of the surface of the horizontal seabed is always constant, while that of the sloping seabed changes periodically along the seabed surface. Even at a small site, the difference between a horizontal seabed and a sloping seabed is still significant. The slope angle has different effects on the seabed at different depths, and the inclination plays an amplification role at some depths and a reduction role at other depths. With an increase in slope angle, the difference between a horizontal seabed and a sloping seabed becomes more significant. Especially at natural frequencies, the amplification factor becomes more significant with increasing slope angle. Therefore, even though the same seawater depth is used in the model, a horizontal seabed model cannot be used to analyze the dynamic response of a sloping seabed or significant errors will occur.

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Section: Introductionmentioning

confidence: 99%

An analytical solution for the dynamic response of a seawater‐sloping seabed‐bedrock system under an oblique incident P wave

Shan

Xie

Dong

et al. 2023

Num Anal Meth Geomechanics

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“…With the gradual increase in marine engineering, the hazards of seismic loads and seawater wave loads to the stability of sea infrastructure and seabed have also received increasing attention. The marine structures on the sloping seabed has attracted increasing attention, including research on pipelines (Xu et al 1 ; Seyfipour and Walker 2 ; Rafiei et al 3 ), wind turbines (Ti and Deng, 4 ), oscillating water column (OWC) devices (Khan and Behera, 5 ), embankments (Zhao and Jeng 6 ; Ni and Teng 7 ), small marine structures (Rafiei et al 8,9 ), and slope stability (Feng and Price 10 ; Dou et al 11 ). All of these studies have concentrated on the dynamic responses of the seabed and structures induced by seawater waves.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An analytical solution for the dynamic response of a seawater‐sloping seabed‐bedrock system under an oblique incident SV wave

Shan,

Xie,

et al. 2023

Num Anal Meth Geomechanics

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The characteristics of seabed ground motion are the theoretical basis for the study of seawater‐soil‐structure interactions and seismic‐induced geological hazards. There are numerous offshore marine structures located on sloping seabeds. Therefore, the sloping seabed's seismic response requires to be investigated. Engineers and scholars are more interested in the SV waves because they carry more energy than the P waves in earthquakes. An analytical solution for the steady‐state response of the inclined seafloor under an oblique incident SV wave is offered. The impacts of the seafloor angle on the fluid pressure and displacement of the saturated sediment layer are investigated under different incident wave frequencies, incident angles, and thicknesses of the seawater layer and sediment layer. By observing along the seabed surface, we discovered that the slope angle might cause considerable variances between different positions even at a small site. While examining the seabed at varying depths, we discovered that the incline angle has distinct impacts on different areas of the seabed. It has an amplifying effect at some depths and a reducing effect at other depths. Generally, as the slope angle increases, the distinction between the responses of the inclined and horizontal seabed becomes more prominent. Especially when the incidence angle of the SV waves is near the critical angle, the impacts of the slope angle become more significant. Even if the horizontal seabed model is employed with the same seawater depth, it is not suitable for analyzing the seismic response of a sloping seabed. Otherwise, significant errors would arise.

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“…The nite element method is widely used and effective technique to assess the stability of the slope [19,20,21,22,23] , however, the nite element method can not solve the large deformation and displacement discontinuity problem. Based on the nite element method, the adaptive nite element method is proposed [24,25] , by using this technique, the seepage dynamics problems can be solved in short time, which indicated the technique has a fast convergence rate. It should be noted that the adaptive nite element method still can not solve the displacement discontinuity problem, thereof, the distinct element method (DEM) was proposed by Cundall [26,27,28,29] , by using this techniques, the displacement between the rock blocks and be easily simulated, moreover, nonlinear deformation and dynamic problems can be solved quickly, and the method is widely used for stability analysis of rock slope.…”

Section: Introductionmentioning

confidence: 99%

Determination of optimal mining width for coal mining under the slope by of using numerical simulation

Zhou

Lai³

et al. 2023

Preprint

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The stability of slope is critical important topic in rock mass engineering. In Panzhihua #7 Coal Mine, the coal mining is occurred under the slope, to obtain the optimal mining width, 125 numerical simulations were conducted, and the corresponding FOS was calculated. From the analysis of the numerical simulation results, it can be found that FOS decrease and then increase with increasing of filling length, meanwhile, the FOS is minimum value when the filling length is within the ranges of 10m and 20m, which is under the toe of slope. Furthermore, the minimum FOS decrease with increasing of mining width. Considered the stability of the slope and mining economy, the mining width is set to 6m, and the numerical simulation results is applied to the engineering practice. To guarantee the safety of the slope, some monitoring points were distributed on the slope, the displacement from numerical simulation and engineering practice is quite close, indicating the numerical simulation results is reliable, and the mining width is reasonable.

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Vector form intrinsic finite element analysis of deepwater J-laying pipelines on sloping seabed

Cited by 16 publications

References 28 publications

An analytical solution for the dynamic response of a seawater‐sloping seabed‐bedrock system under an oblique incident P wave

An analytical solution for the dynamic response of a seawater‐sloping seabed‐bedrock system under an oblique incident P wave

An analytical solution for the dynamic response of a seawater‐sloping seabed‐bedrock system under an oblique incident SV wave

Determination of optimal mining width for coal mining under the slope by of using numerical simulation

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