Numerical Investigation of Novel Spudcan Shapes for Easing Spudcan-Footprint Interactions

Jun, Min; Kim, Y. H.; Hossain, Muhammad Shazzad; Cassidy, Mark; Hu, Yuxia; Sim, Jae-Uk

doi:10.1061/(asce)gt.1943-5606.0001925

Cited by 23 publications

(19 citation statements)

References 27 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the symmetry of the problem, half spudcan and soil were modelled. As obtained from preliminary convergence studies [26,[28][29][30], the lateral extension of the soil domain was 2.5D and 4.5D from the centre of the footprint on the left and right sides, respectively.…”

Section: Numerical Analysis Detailsmentioning

confidence: 85%

“…3D LDFE analyses were carried out using the coupled Eulerian-Lagrangian (CEL) approach in the commercial FE package ABAQUS/Explicit [21]. Qiu et al [22][23][24], Tho et al [25,27], Hu et al [26,28], Zheng et al [29] and Jun et al [30] investigated various spudcan penetrating behaviours using the CEL approach and provided confidence to its applicability to solve problems involving large deformations.…”

Section: Numerical Analysis Detailsmentioning

confidence: 99%

See 1 more Smart Citation

Optimising spudcan shape for mitigating horizontal and moment loads induced on a spudcan penetrating near a conical footprint

Jun

Kim

Hossain

et al. 2018

Applied Ocean Research

Self Cite

View full text Add to dashboard Cite

The horizontal force and moment induced on a spudcan as it penetrates next to an existing seabed footprint have been identified as one of the key challenges in the offshore oil and gas industry. This paper assesses the potential of changing and then optimising the spudcan foundation shape to mitigate the spudcan-footprint interaction. Large-deformation finiteelement (LDFE) analyses are performed using the Coupled Eulerian-Lagrangian (CEL) approach with the simple elastic-perfectly plastic Tresca soil model modified to enable strain softening and to incorporate strain-rate dependency of the shear strength. The spudcan shape was optimised by parametric analyses varying the spudcan's skirt length, underside profile, and number of holes through the spudcan periphery. A spudcan with a flatter (or even concave) underside profile and with holes was shown to significantly reduce the induced horizontal force and moment during reinstallation next to an existing footprint. However, use of skirts has an adverse influence. Based on the results, an optimised spudcan shape is proposed.

show abstract

Section: Numerical Analysis Detailsmentioning

confidence: 85%

Section: Numerical Analysis Detailsmentioning

confidence: 99%

Optimising spudcan shape for mitigating horizontal and moment loads induced on a spudcan penetrating near a conical footprint

Jun

Kim

Hossain

et al. 2018

Applied Ocean Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…A mature and robust numerical modeling technique is urgently needed in investigating the spudcan-footprint interaction. 16 Therefore, the Coupled Eulerian-Lagrangian (CEL) technique is adopted to simulate the spudcan reinstallation next to a footprint. Using CEL method, we put the main emphasis on the reinstallation of spudcan near the footprint, which was left in site after the extraction of the spudcan.…”

Section: Aims Of the Present Studymentioning

confidence: 99%

Study on spudcan reinstallation next to a footprint using large deformation finite element method

Yin

Zhai

Dong

2020

Proceedings of the Institution of Mechanical Engineers, Part M:

View full text Add to dashboard Cite

Safety problems may occur to the jack-up rig when it is installed near the old footprint. In this study, three-dimensional large deformation finite element simulations using the Coupled Eulerian–Lagrangian (CEL) method have been carried out on the spudcan–footprint interaction problem. The correctness of the CEL method is verified through comparison with existing centrifuge tests. Uniform and non-uniform clays with different shear strength profiles encompassing the typical strength range of practical interest are considered as the subsea soil. The principle of thermo-mechanical coupled analysis is provided, after which this method is used to realize the updating of clay strength profiles in non-uniform clays. The influences of initial penetration depth, offset distance and shear strength profile on horizontal and moment loads are investigated. Distributions of soil load on the spudcan are presented, and their effect on the resulted inclined loads during spudcan reinstallation is analyzed. In both uniform and non-uniform clays, two peak values are obtained on the horizontal and moment load profiles during the reinstallation near the footprint. The relationship between the normalized maximum value of the horizontal load and initial penetration depth is described as a combination of linear and quadratic equations. While for the peak moment load, the offset distance is the main influencing factor. Finally, failure mechanisms of the surrounding soil during the penetration influenced by the footprint are discussed by defining four failure mechanism stages.

show abstract

“…Their research showed that the soil is obviously disturbed during the initial penetration and will recover with time. To simplify the problem, many of the following studies assumed an artificial footprint, such as Kong [13], Zhang et al [15], Jun et al [16][17][18][19]. The assumption of an artificial reverse cone footprint may respond to a fully recovered 'real' footprint after a long period from the initial penetration.…”

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

View full text Add to dashboard Cite

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.

show abstract

Numerical Investigation of Novel Spudcan Shapes for Easing Spudcan-Footprint Interactions

Cited by 23 publications

References 27 publications

Optimising spudcan shape for mitigating horizontal and moment loads induced on a spudcan penetrating near a conical footprint

Optimising spudcan shape for mitigating horizontal and moment loads induced on a spudcan penetrating near a conical footprint

Study on spudcan reinstallation next to a footprint using large deformation finite element method

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

Contact Info

Product

Resources

About