Wave-induced seabed instability in front of a breakwater

Jeng, Dong‐Sheng

doi:10.1016/s0029-8018(96)00046-7

Cited by 144 publications

(82 citation statements)

References 28 publications

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“…This type of soil response is similar to that induced by earthquakes, which resulted in the build-up of the excess pore pressure. The other is generated by transient or oscillatory excess pore pressure that is accompanied by the damping of amplitude and phase lag in the pore pressure [22,7,8].…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional poro-elasto-plastic model for wave-induced seabed response around submarine pipeline

Zhang

Han

2015

Soil Dynamics and Earthquake Engineering

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a b s t r a c tThe evaluation of the wave-induced excess pore pressure around a buried pipeline is particularly important for pipeline engineers involved in the design of offshore pipelines. Existing models for the wave-induced seabed response around submarine pipeline have been limited to poro-elastic soil behavior and de-coupled oscillatory and residual mechanisms for the rise in excess pore water pressure. To overcome the shortcoming of the existing models, in this study a three-dimensional poro-elastoplastic soil model with submarine pipeline is established, in which both oscillatory and residual mechanisms can be simulated simultaneously. With the proposed model, a parametric study is conducted to investigate the relative differences of the predictions of the wave-induced pore pressure with poro-elasto-plastic model. Based on numerical examples, it can be concluded that the poro-elastoplastic behaviors of soil have more significant influence on wave-induced pore pressure of seabed around submarine pipeline. As the seabed depth increases, the normalized pore pressures decrease rapidly at the upper part of seabed, and then change slightly at the lower part of the seabed. Soil permeability and wave period have obvious influence on the wave-induced normalized pore pressure.

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Section: Introductionmentioning

confidence: 99%

“…Among these, analytical approximations have been developed by various researchers such as Madsen [11], Yamamoto et al [22], Mei and Foda [14], and Jeng [7,8]. Numerical simulations also have been widely applied to examine such a problem in recent years.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional poro-elasto-plastic model for wave-induced seabed response around submarine pipeline

Zhang

Han

2015

Soil Dynamics and Earthquake Engineering

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“…Two significant mechanisms accounting for wave-induced soil response, including oscillatory pore pressure and residual pore pressure, have been observed in laboratory experiments and field measurements [4] , as shown in Figure 1. The first mechanism, termed as transient or oscillatory excess pore pressure, is accompanied by the attenuation of amplitude and the phase lag in pore pressure changes [5,6] . This mechanism is more important for unsaturated marine sediments and deeper water region.…”

mentioning

confidence: 99%

“…The first mechanism, termed as transient or oscillatory excess pore pressure, is accompanied by the attenuation of amplitude and the phase lag in pore pressure changes [5,6] . This mechanism is more important for unsaturated marine sediments and deeper water region.…”

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confidence: 99%

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Ocean waves propagating over a porous seabed: Residual and oscillatory mechanisms

et al. 2007

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Two mechanisms for the wave-induced pore pressures in a porous seabed, i.e. oscillatory and residual excess pore pressures, have been observed in laboratory experiments and field measurements. Most previous investigations have focused on one of the mechanisms individually. In this paper, an analytical solution for the wave-induced residual pore pressure, which is not available yet, is derived, and compared with the existing experimental data. With the new solution, a parametric analysis is performed to clarify the applicable ranges of two mechanisms. Then, a simplified approximation for the prediction of wave-induced liquefaction potential is proposed for engineering practice.seabed, pore pressure, residual, oscillatory, wave loading One of the important marine geotechnical engineering considerations for many engineering installations in oceanic environments, such as platform, pipeline and anchors, is the liquefaction potential of seabed due to ocean waves. Numerous examples of liquefaction have been reported in the literature, such as, floatation of pipeline during storm [1] , sinking of several measuring instructions in Mississippi Delta [2] and subsidence of offshore breakwaters at Niagata Coast, Japan [3] . Two significant mechanisms accounting for wave-induced soil response, including oscillatory pore pressure and residual pore pressure, have been observed in laboratory experiments and field measurements [4] , as shown in Figure 1. The first mechanism, termed as transient or oscillatory excess pore pressure, is accompanied by the attenuation of amplitude and the phase lag in pore pressure changes [5,6] . This mechanism is more important for unsaturated marine sediments and deeper water region. The second mechanism, termed as the residual pore pressure, is the build-up of excess pore pressure caused by contraction of the soil under the action of cyclic loading [7,8] . This mechanism is similar to the earthquake-induced pore pressure accumulation.Numerous investigations for ocean waves propagating over a porous seabed have been carried

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Non-Linear Wave-Induced Response of Porous Seabed: A Finite Element Analysis

Jeng

Lin

1997

Int. J. Numer. Anal. Meth. Geomech.

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SUMMARYConventional investigations of waves-seabed interaction problems have been only concerned with the soil response due to two-dimensional linear progressive waves over a uniform seabed. However, the effects of non-linear waves which have been reported in the literature may be significantly different. In this paper, a finite element model is developed to investigate the non-linear wave-induced seabed response with variable permeability and shear modulus in a three-dimensional domain. The finite element formulations are fully presented in this paper. The numerical model is verified with the previous investigations through the reduced form of the present solution. The numerical results indicate that the influence of non-linear wave components cannot always be ignored without substantial error. Furthermore, the wave-induced seabed response is affected significantly by variable permeability in coarser seabeds and variable shear modulus in finer seabeds.

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Wave-induced seabed instability in front of a breakwater

Cited by 144 publications

References 28 publications

Three-dimensional poro-elasto-plastic model for wave-induced seabed response around submarine pipeline

Three-dimensional poro-elasto-plastic model for wave-induced seabed response around submarine pipeline

Ocean waves propagating over a porous seabed: Residual and oscillatory mechanisms

Non-Linear Wave-Induced Response of Porous Seabed: A Finite Element Analysis

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