Momentary liquefaction of porous seabed under vertical seismic action

Chen, Weiyun; Jeng, Dong‐Sheng; Chen, Guoxing; Zhao, Hongyi; He, Rui; Gao, Hongmei

doi:10.1016/j.apor.2018.02.005

Cited by 16 publications

(5 citation statements)

References 29 publications

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“…presented analytical solutions to study the surface motions of gassy ocean sediment induced by oblique incident SV waves and P waves. Chen et al 12 . presented an analytical solution to evaluate the momentary liquefaction of porous seabeds under vertical seismic action.…”

Section: Introductionmentioning

confidence: 99%

“…Chen et al 10,11 presented analytical solutions to study the surface motions of gassy ocean sediment induced by oblique incident SV waves and P waves. Chen et al 12 presented an analytical solution to evaluate the momentary liquefaction of porous seabeds under vertical seismic action. Chen et al 13 researched vertical seismically induced responses and instantaneous liquefaction in a two-layer porous seabed.…”

Section: Introductionmentioning

confidence: 99%

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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%

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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show abstract

“…Engineers usually adopt the ratio between residual pore pressure and initial mean normal effective stress of the seabed to assess the liquefaction level (Liu et al., 2009; Sumer, 2014). Depending on the EPP level, there are two bed states, incomplete and complete liquefaction (or surface liquefaction and massive liquefaction), to amplify the erosion (Chen et al., 2018). The former is associated with a low‐level EPP that causes surface sediment liquefaction (Tzang et al., 2011) and an upward pore water flow, which exerts a drag force to promote dislodgement and entrainment of surface sediment aggregates.…”

Section: Introductionmentioning

confidence: 99%

Importance of Bed Liquefaction‐Induced Erosion During the Winter Wind Storm in the Yellow River Delta, China

Niu,

Xie,

Lin

et al. 2023

JGR Oceans

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Data obtained during a 5‐month field observation of the Yellow River Delta show that the storm wave‐related oscillatory flows are mainly in an intermittently turbulent regime (400 < ReΔ < 1,200). Wave‐induced seabed liquefaction causes changes to the bed erodibility and increases the sediment entrainment rate, resulting in the formation of fluid mud layer (FML) during winter wind events. The strong NE winter winds lead to most of the wave‐induced liquefaction events in the study area. It was found the sediment erosion rate is underestimated when we solely focus on the wave‐induced bottom shear stress. To parameterize wave‐induced excess pore pressure buildup and sediment liquefaction, a series of experiments were conducted in a large wave flume and a new liquefaction‐erosion method is proposed to calculate the sediment erosion flux. Analysis of model results shows that the FML thickness is about 2–12 cm at the storm‐arrival stage during the entire observation period. The thickness of FML significantly increases with the increase of wave height and decrease of water depth. Once the FML is formed, strong currents can remove fluid mud 10 hr after the storm‐arrival stage, while the background currents on calm days can hardly cause suspension. The erosion rate in liquefaction zones can increase 5–10 times compared with the erosion rate in nonliquefaction conditions. The whole Bohai Sea is highly turbid after intense NE winter wind, and the liquefaction zones during winter winds would be the major sediment source. Enhanced sediment erosion can cause the subsequent degradation of the subaqueous Yellow River Delta.

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“…The study of seismic characteristics of seabed sediment layers is the basis for research on the seismic interaction between seawater, soil, and structures, and it is necessary to carry out research on this topic. Many researchers have studied horizontal fluid‐saturated sediment and gassy‐ocean sediment (Wang et al., 14,15 Wang et al., 16 Chen et al 17–20 …”

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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Momentary liquefaction of porous seabed under vertical seismic action

Cited by 16 publications

References 29 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

Importance of Bed Liquefaction‐Induced Erosion During the Winter Wind Storm in the Yellow River Delta, China

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

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