Failure mechanisms of a spudcan penetrating next to an existing footprint

Kong, Vickie; Cassidy, Mark; Gaudin, Christophe

doi:10.1016/j.taml.2014.12.001

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…First, for penetration depths  the footprint toe level (i.e. dtip  20 mm), as expected, the vertical load resistance on a flat ground was consistently higher compared to that on a sloped ground (Figures 8a and 10a) due to lower spudcan base-soil contact area (Kong et al 2015;Zhang et al 2015). The difference was more obvious for the free sliding penetration (see Figure 8a).…”

Section: Typical Responsesupporting

confidence: 66%

“…Second, a somewhat S-shaped response profiles can be seen in Figures 10b and 10c for the spudcan penetration adjacent to an unperforated footprint (Test SF). This was perhaps partly because of the balancing of various mobilised failure mechanisms (as illustrated by Kong et al 2015 andZhang et al 2015) and corresponding leg splay along the penetration depths of this rigidly fixed (allowing no sliding) spudcan, and partly because of the existence of a profound drop in the corresponding undrained shear strength profile around 80 mm depth (see Figure 5). Perforation drilling ensured a somewhat vertical penetration and hence eliminated the former, leading to negligible M0 and H0 along the penetration depth.…”

Section: Typical Responsementioning

confidence: 96%

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Perforation drilling for easing spudcan–footprint interaction issues

Hossain

Stainforth

2016

Ocean Engineering

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Section: Typical Responsesupporting

confidence: 66%

Section: Typical Responsementioning

confidence: 96%

Perforation drilling for easing spudcan–footprint interaction issues

Hossain

Stainforth

2016

Ocean Engineering

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“…The capacity of the spudcans under combined loading needs to be carefully assessed. The problems of existing footprint, extraction of spudcans and skirted spudcan are not included in this review and can be found in recent publications [37][38][39][40][41].…”

Section: Spudcans For Jack-up Platformsmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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As the offshore engineering moving from shallow to deep waters, the foundation types for fixed and floating platforms have been gradually evolving to minimize engineering costs and structural risks in the harsh offshore environments. Particular focus of this paper is on the foundation instability and its failure mechanisms as well as the relevant theory advances for the prevailing foundation types in both shallow and deep water depths. Piles, spudcans, gravity bases, suction caissons, and plate anchors are detailed in this paper. The failure phenomena and mechanisms for each type of foundations are identified and summarized, respectively. The theoretical approaches along with sophisticated empirical solutions for the bearing capacity problems are then presented. The major challenges are from flow-structure-soil coupling processes, rigorous constitutive modeling of cyclic behaviors of marine sediments, and the spatial variability of soil properties for large-spreading structures. Further researches are suggested to reveal the instability mechanisms for underpinning the evolution of offshore foundations. Citation:Gao F P, Li J H, Qi W G, et al. On the instability of offshore foundations: theory and mechanism.

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“…Cassidy et al [3] used a 1:250 scale model of current Mod 'V 'jack-up in their centrifuge tests to simulate the interaction between real spudcan and soil. Kong et al [13,14] replaced real spudcan with flat base footing in their centrifuge tests to eliminate the variables related to spudcan geometry. Cassidy et al [3] used a 1:250 scale model of current Mod 'V 'jack-up in their centrifuge tests to simulate the interaction between real spudcan and soil.…”

Section: Previous Workmentioning

confidence: 99%

Finite Element Analysis and Parametric Study of Spudcan Footing Geometries Penetrating Clay Near Existing Footprints

Zhang

et al. 2019

JMSE

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Most existing research on the stability of spudcans during reinstallation nearing footprints is based on centrifuge tests and theoretical analyses. In this study, the reinstallation of the flat base footing, fusimform spudcan footing and skirted footing near existing footprints are simulated using the coupled Eulerian–Lagrangian (CEL) method. The effects of footprints’ geometry, reinstallation eccentricity (0.25D–2.0D) and the roughness between spudcan and soil on the profiles of the vertical force, horizontal force and bending moment are discussed. The results show that the friction condition of the soil–footing interface has a significant effect on H profile but much less effect on M profile. The eccentricity ratio is a key factor to evaluate the H and M. The results show that the geometry shape of the footing also has certain effects on the V, H, and M profiles. The flat base footing gives the lowest peak value in H but largest in M, and the performances of the fusiform spudcan footing and the skirted footing are similar. From the view of the resultant forces, the skirted footing shows a certain potential in resisting the damage during reinstallation near existing footprints by comparing with commonly used fusiform spudcan footings. The bending moments on the leg–hull connection section of different leg length at certain offset distances are discussed.

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Failure mechanisms of a spudcan penetrating next to an existing footprint

Cited by 20 publications

References 14 publications

Perforation drilling for easing spudcan–footprint interaction issues

Perforation drilling for easing spudcan–footprint interaction issues

On the instability of offshore foundations: theory and mechanism

Finite Element Analysis and Parametric Study of Spudcan Footing Geometries Penetrating Clay Near Existing Footprints

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