Experimental investigation on the effect of spudcan shape on spudcan-footprint interaction

Hossain, Muhammad Shazzad; Stainforth, R.; Ngo, Vinh Triet; Cassidy, Mark; Kim, Y. H.; Jun, Min

doi:10.1016/j.apor.2017.10.003

Cited by 16 publications

(9 citation statements)

References 12 publications

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“…2,[6][7][8] Gan et al conducted a series of centrifuge model tests to investigate the changes in the shear strength of soils in a footprint with time. 12 The effect of these changes on the spudcan-footprint interaction in normally and over-consolidated clays was analyzed. It was found that the footprint with remold soil has a diameter of 1.5D.…”

Section: Previous Literaturesmentioning

confidence: 99%

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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:

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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.

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Section: Previous Literaturesmentioning

confidence: 99%

“…Hossain et al conducted the 1 g experimental investigation on the effect of spudcan’s shape on the spudcan–footprint interaction. Results showed that spudcans with slots 12 and perforation drilling 13 can be effective at reducing horizontal and moment loads, and the sliding for free sliding legs.…”

Section: Introductionmentioning

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:

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“…Mitigation measures to alleviate the sliding risk during the spudcan installation close to footprints can be divided into two categories, namely, footing modifications and seabed modifications [15]. For the first category, Hossian et al [16] laid a foundation by experimental studies of the effect of spudcan's shape on spudcan-footprint interaction. Jun et al [17][18][19] proposed some novel spudcan shapes for easing spudcan-footprint interaction and optimized the shapes through experimental and numerical investigations.…”

Section: Introductionmentioning

confidence: 99%

Mitigation Effect of Perforation Drilling on the Sliding Risk during Spudcan Installation Close to Footprints

Gao

Liu

Shi

et al. 2020

JMSE

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Perforation drilling is a promising technique to mitigate the sliding risk of jack-up units installed around footprints. Based on the coupled Eulerian–Lagrangian (CEL) method, a 1/2 finite element model, including a rigid Lagrangian spudcan and a Eulerian soil part, was established, and the contact interface was modelled with the Coulomb friction model. Validated against an indoor perforation test, the model was adopted to investigate the mitigation mechanism and effects of the borehole diameter, number, depth, and the drilling range. The simulations reveal that the mitigation efficiency increases with the borehole diameter, number, and depth. However, it shows little improvement if the borehole depth increases beyond double footprint depth. The semi-drilling at the outer side of the footprint is a little more effective than the full-drilling at both the inner and outer sides of the footprint. The present work emphasizes the effects of perforation drilling parameters on the mitigation efficiency, which are of great significance to guide the engineering practice and guarantee the safe operation of the jack-up reinstallation close to existing footprints.

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“…To alleviate this issue, the first step was to investigate the performance of a spudcan installation next to a footprint. Due to both physical testing and numerical simulation challenges, the problem was simplified by considering a single cylindrical leg attached to a flat plate or generic spudcan and either a fixed head condition at the top of the leg [4][5][6][7][8][9][10] or a free head condition that allows sliding of the leg [11][12][13]. The soil failure mechanisms were exposed, the underlying behaviour was elucidated, and the critical offset ratio  (defined as  = D, where  is the distance between the footprint centre and the spudcan centre, and D is the spudcan diameter) was identified as 0.5~1.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, Hossain et al and Jun et al [13,23,24] have focused on adjusting spudcan shapes to ease spudcan-footprint interactions. These studies have led to the establishment of a novel spudcan shape with a flat base and 4 holes [24]; the flat base reduces the induced horizontal force on the bottom slope of the spudcan and the holes provide a preferential soil flow path and force the spudcan to penetrate vertically.…”

Section: Introductionmentioning

confidence: 99%

Global jack-up rig behaviour next to a footprint

et al. 2019

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Experimental investigation on the effect of spudcan shape on spudcan-footprint interaction

Cited by 16 publications

References 12 publications

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

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

Mitigation Effect of Perforation Drilling on the Sliding Risk during Spudcan Installation Close to Footprints

Global jack-up rig behaviour next to a footprint

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