Accumulation of pore water pressure in a homogeneous sandy seabed around a rocking mono-pile subjected to wave loads

Liao, Chencong; Chen, Jin-Jian; Zhang, Yizhou

doi:10.1016/j.oceaneng.2018.12.072

Cited by 35 publications

(15 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…P res is the residual pore-pressure that is period-averaged, and is the result of accumulated plastic deformation of the soil skeleton. It has been acknowledged recently that with the accumulation of pore-pressure, continuous seepage flow appears near the seabed surface and may lead to obvious particle migration [16][17][18]. Many studies have been performed for the accumulation of excess pore-pressure in the seabed induced by waves [8,[19][20][21][22].…”

Section: Analytical Solution For Wave-induced Pore-pressure Accumulationmentioning

confidence: 99%

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

Guo

Zhou

Zhu

et al. 2019

JMSE

View full text Add to dashboard Cite

Silty sand is a kind of typical marine sediment that is widely distributed in the offshore areas of East China. It has been found that under continuous actions of wave pressure, a mass of fine particles will gradually rise up to the surface of silty sand seabeds, i.e., the phenomenon called wave-induced soil erosion. This is thought to be due to the seepage flow caused by the pore-pressure accumulation within the seabed. In this paper, a kind of three-phase soil model (soil skeleton, pore fluid, and fluidized soil particles) is established to simulate the process of wave-induced soil erosion. In the simulations, the analytical solution for wave-induced pore-pressure accumulation was used, and Darcy flow law, mass conservation, and generation equations were coupled. Then, the time characteristics of wave-induced soil erosion in the seabed were studied, especially for the effects of wave height, wave period, and critical concentration of fluidized particles. It can be concluded that the most significant soil erosion under wave actions appears at the shallow seabed. With the increases of wave height and critical concentration of fluidized particles, the soil erosion rate and erosion degree increase obviously, and there exists a particular wave period that will lead to the most severe and the fastest rate of soil erosion in the seabed.

show abstract

Section: Analytical Solution For Wave-induced Pore-pressure Accumulationmentioning

confidence: 99%

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

Guo

Zhou

Zhu

et al. 2019

JMSE

View full text Add to dashboard Cite

show abstract

“…An integrated numerical model proposed by Liao [23] is set up to calculate the wave-induced seabed response around a mat foundation numerically. This numerical model has been employed and verified repeatedly in previous researches [3,[23][24][25], and it consists of two sub-models: The flow sub-model and the seabed sub-model. For the flow sub-model, the finite volume method (FVM) is employed to solve the Reynolds-averaged Navier-Stokes (RANS) equation in FLOW3D ® .…”

Section: Numerical Verificationmentioning

confidence: 99%

Experimental Study on the Distribution of Wave-Induced Excess Pore Pressure in a Sandy Seabed around a Mat Foundation

Yuan

Liao

Zhou

2019

JMSE

View full text Add to dashboard Cite

Mat foundations are widely used in jack-up offshore platforms to support and transfer loads. Regarding mat foundations working on the seabed, the excess wave-induced pore pressure is critical to seabed stability, which may finally cause structural failure. Therefore, it is important to investigate the distribution of the excess pore pressure in the seabed around the mat foundation. In this study, experiments were performed to study the excess pore pressure distribution around a mat foundation in scale considering the true load state by recording wave profiles and pore pressures inside a sandy seabed. To guarantee the reliability of experiments, a numerical study was conducted and compared with the experimental results. Experimental results indicate that with the existence of the mat foundation, the excess pore pressure is higher at the region, the range of which is the width of the model mat (Wm) before the structure. The maximum pore pressure appears at 0.55 Wm in front of the center of the mat foundation. In addition, the current significantly increases the range of high pore pressure area and the amplitude of the excess pore pressure. As the mat orientation changes, the position of the maximum pore pressure changes from the front to the edge of the mat.

show abstract

“…To date, considerable effort has been devoted to investigating the pore pressure response within the seabed around the offshore foundation by numerical methods [13,14]. The first method is the semi-empirical method, which is based on the simplified elastic-plastic model and predicts the pore pressure response around the offshore foundation subjected to cyclic loads [15,16].…”

Section: Introductionmentioning

confidence: 99%

Accumulation of Pore Pressure in a Soft Clay Seabed around a Suction Anchor Subjected to Cyclic Loads

Chen

et al. 2019

JMSE

View full text Add to dashboard Cite

A suction anchor is an appealing anchoring solution for floating production. However, the possible effects of residual pore pressure can be rarely found any report so far in term of the research and design. In this study, the residual pore pressure distribution characteristics around the suction anchor subjected to vertical cyclic loads are investigated in a soft clay seabed, and a three-dimensional damage-dependent bounding surface model is also proposed. This model adopts the combined isotropic-kinematic hardening rule to achieve isotropic hardening and kinematic hardening of the boundary surface. The proposed model is validated against triaxial tests on anisotropically consolidated saturated clays and normally consolidated saturated clays. The analytical results show that the excess pore water pressure accumulates primarily on the outside of the suction anchor, whereas negative pore water pressure mainly on the inside. The maximum values of both sides appear in the lower part of the seabed. According to the distribution characteristics of the residual pore pressure, a perforated anchor is proposed to reduce the accumulation of excess pore water pressure. A comparative study generally shows that the perforated anchor can effectively reduce the accumulation of excess pore water pressure.

show abstract

Accumulation of pore water pressure in a homogeneous sandy seabed around a rocking mono-pile subjected to wave loads

Cited by 35 publications

References 30 publications

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

Experimental Study on the Distribution of Wave-Induced Excess Pore Pressure in a Sandy Seabed around a Mat Foundation

Accumulation of Pore Pressure in a Soft Clay Seabed around a Suction Anchor Subjected to Cyclic Loads

Contact Info

Product

Resources

About