The undrained bearing capacity of a spudcan foundation under combined loading in soft clay

Zhang, Youhu; Bienen, Britta; Cassidy, Mark; Gourvenec, Susan

doi:10.1016/j.marstruc.2011.06.002

Cited by 122 publications

(39 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is commonly perceived that the backflow will increase the foundation's bearing capacity, especially the horizontal and moment capacities. This is indeed indicated in the work by Templeton et al (2005), Templeton (2009) and Zhang et al (2011Zhang et al ( , 2012a, though the soil disturbance caused by spudcan installation was neglected in these numerical studies. The backflow also potentially acts as a "seal" on top of the spudcan, allowing suction to be developed, as observed in centrifuge experiments (Cassidy et al, 2004a;Purwana et al, 2005;Gaudin et al, 2011).…”

Section: Introductionmentioning

confidence: 55%

“…To expand the experimental database for wider ranges of soil properties and embedment depths, a numerical approach with a large deformation finite element (LDFE) simulation of the spudcan installation and subsequent small strain finite element analyses to define the VHM bearing capacity surface was proposed (Zhang et al, 2014b). In contrast to previous numerical analyses assuming a "wished-in-place" spudcan (Zhang et al, 2011), the installation effects (large soil displacement and remolding) were captured by the combined use of LDFE and a strain softening soil model in simulation of spudcan penetration. The post installation shear strength profile is then used to calculate the combined VHM capacity surface.…”

Section: Yield Surfacementioning

confidence: 99%

See 1 more Smart Citation

Jack-up push-over analyses featuring a new force resultant model for spudcans in soft clay

Bienen

Cassidy

2014

Ocean Engineering

Self Cite

View full text Add to dashboard Cite

a b s t r a c tWith the development of the offshore oil and gas industry, mobile jack-up drilling platforms are increasingly utilized in deeper waters and harsher environments. Excessive conservatism in jack-up site specific assessment may result in undue rejection of a unit. In soft clayey seabeds, the spudcan foundations of the jack-up platform penetrate deeply into the soil with partial or complete backflow. Although the deep penetration and associated backflow are widely perceived to increase horizontal and moment foundation bearing capacities in particular, the problem is not well understood. In this paper therefore, a plasticity foundation model is proposed that accounts for the effects of backflow. It has been developed through a combined numerical and experimental study. The model is suitable for performing integrated soil-structure analyses. Results of such analyses of a jackup under quasi-static push-over load are discussed to highlight the impact of the model in the context of site specific assessment of jack-up rigs in soft clay.

show abstract

Section: Introductionmentioning

confidence: 55%

Section: Yield Surfacementioning

confidence: 99%

Jack-up push-over analyses featuring a new force resultant model for spudcans in soft clay

Bienen

Cassidy

2014

Ocean Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…At the sides of the model, no horizontal movements are permitted while the base of the model is fixed in all three directions. The foundation-soil interaction is assumed to be bonded to simulate fully rough spudcan soil interaction (Zhang et al, 2011(Zhang et al, , 2012.…”

Section: Random Finite Element Methodsmentioning

confidence: 99%

Bearing capacity of spudcan foundations in a spatially varying clayey seabed

Huang³

et al. 2017

Ocean Engineering

View full text Add to dashboard Cite

A B S T R A C TSpudcan foundations are often pushed into a spatially varying non-homogeneous seabed to provide bearing capacity for a mobile jack-up platform. The natural variability of soil properties coupled with the complexity of loading conditions make determining the bearing capacity of spudcan foundations a challenging problem. A random finite element method is established to investigate the bearing capacity of a spudcan foundation embedded in a spatially varying clayey seabed when subjected to vertical, horizontal and moment loadings. A criterion is proposed for determining the characteristic value of the shear strength for the random seabed. Results indicate that the spatial variability in the clayey seabed significantly reduces the bearing capacity of a spudcan foundation. This reduction is more significant in the vertical bearing capacity than in the horizontal and moment bearing capacities. The mean bearing capacity is smaller for the clay with larger coefficient of variation of undrained shear strength. A characteristic value of mean minus a standard deviation of the undrained shear strength is capable to ensure the probability of failure is not greater than 5%. This study provide an evaluation method for the spatial variability effect of a clayey seabed, paving the way for a costeffective design of spudcan foundations.

show abstract

“…The spudcans are between 10 m to 20 m in diameter [1] [2]. Jack-ups often return to sites were previous operations have left footprints in the seabed.…”

mentioning

confidence: 99%