Wave‐induced pore pressure in relation to ocean floor stability of cohesionless soils

Seed, H. Bolton; Rahman, M.

doi:10.1080/10641197809379798

Cited by 268 publications

(144 citation statements)

References 6 publications

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“…However, all previous investigations [7,8] concerned with residual mechanism have been based on linear wave theory. It is well known that linear wave theory is insufficient from the aspect of ocean engineering, but it can provide some fundamental knowledge for engineers, since it is the leading order solution.…”

Section: Parametric Analysesmentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…Numerous investigations for ocean waves propagating over a porous seabed have been carried out since the 1970s [5][6][7][8][9][10] . Among these, both mechanisms have been considered individually.…”

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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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Section: Parametric Analysesmentioning

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confidence: 99%

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

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“…As noted in Section 4, Seed and his coworkers (e.g.. Seed and Rahman, 1978) introduced the concept of pore pressure generation under cycUc loading condition to investigate the response of seafloor sands subjected to storm wave loadings (see equation 4.1). Siddharthan (1987) combined this approach with that of Yamamoto and Madsen, to analyze the seafloor response to a storm wave group.…”

Section: Pomentioning

confidence: 99%

“…The concept of pore pressure generation under cycUc loading condition was first introduced by Seed and his coworkers in various publications (e.g., DeAlba et al, 1976;Martin et al, 1975; Seed and Brooker, 1977). Rahman et al, 1977;Seed et al, 1976;Seed and Rahman, 1978) and outUned in Seed and Idriss (1982). Such an approach is known as "effective stress method."…”

Section: Liquefaction Of Soilsmentioning

confidence: 99%

Chapter 5 Propagation of waves in porous media

Çorapçıoplu

Tuncay

1996

Advances in Porous Media

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Wave propagation in porous media is of interest in various diversified areas of science and engineer ing. The theory of the phenomenon has been studied extensively in soil mechanics, seismology, acoustics, earthquake engineering, ocean engineering, geophysics, and many other disciplines. This review presents a general survey of the Hterature within the context of porous media mechanics. Following a review of the Biot's theory of wave propagation in Unear, elastic, fluid saturated porous media which has been the basis of many analyses, we present various analytical and numerical solutions obtained by several researchers. Biot found that there are two dilatational waves and one rotational wave in a saturated porous medium. It has been noted that the second kind of dilatational wave is highly attenuated and is associated with a diffusion type process. The influence of couphng between two phases has a decreasing effect on the first kind wave and an increasing effect on the second wave. Procedures to predict the hquefaction of soils due to earthquakes have been reviewed in detail. Extension of Biot's theory to unsaturated soils has been discussed, and it was noted that, in general, equations developed for saturated media were employed for unsaturated media by replacing the density and compressibility terms with modified values for a water-air mixture. Various approaches to determine the permeabihty of porous media from attenuation of dilatational waves have been described in detail. Since the prediction of acoustic wave speeds and attenuations in marine sediments has been extensively studied in geophysics, these studies have been reviewed along with the studies on dissipation of water waves at ocean bottoms. The mixture theory which has been employed by various researchers in continuum mechanics is also discussed within the context of this review. Then, we present an alternative approach to obtain governing equations of wave propagation in porous media from macro scopic balance equations. Finally, we present an analysis of wave propagation in fractured porous media saturated by two immiscible fluids.

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Wave-induced pore pressure around a buried pipeline in Gibson soil: finite element analysis

Jeng

Lin

1999

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

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SUMMARYThe water wave}induced pore pressure on a pipeline buried in a porous seabed is investigated. Unlike conventional investigations, shear modulus of the seabed is considered to vary with soil depth in this study. The boundary value problem describing soil stresses as well as pore water pressure under periodical wave loading is solved numerically by using a Finite Element Method. Employing the principle of repeatability, the lateral boundary conditions are obtained "rst and veri"ed with previous analytical solutions. Then, the wave}sealed}pipe interaction problem can be solved to obtain the wave}induced soil response. The e!ects of variable shear modulus, geometry of the pipe and the degree of saturation on the wave}induced pore pressure are found to be signi"cant.

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Wave‐induced pore pressure in relation to ocean floor stability of cohesionless soils

Cited by 268 publications

References 6 publications

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

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

Chapter 5 Propagation of waves in porous media

Wave-induced pore pressure around a buried pipeline in Gibson soil: finite element analysis

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