Spudcan Penetration Analysis for Case Histories in Clay

Hossain, Muhammad Shazzad; Zheng, Jingbin; Menzies, David; Meyer, L.V.; Randolph, Mark

doi:10.1061/(asce)gt.1943-5606.0001133

Cited by 30 publications

(14 citation statements)

References 18 publications

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“…This approach is further extended to account for strain-rate dependency and strain softening [50]. These methods were assessed by comparing the predictions with the field measurements at 16 sites in the Gulf of Mexico [51,52]. The comparison indicates that the method by Houlsby and Martin [47] provides the lower bound load-penetration predictions.…”

Section: Penetration Of Spudcans (1) Bearing Capacity Failure In Unifmentioning

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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Section: Penetration Of Spudcans (1) Bearing Capacity Failure In Unifmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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“…1500% shear strain; Randolph, 2004) was considered. Further details can be found in Hossain et al (2014).…”

Section: Numerical Modellingmentioning

confidence: 99%

“…Penetration resistance: field data Menzies & Roper (2008) and Hossain et al (2014) reported case histories from 14 different locations in the Gulf of Mexico. The soils were predominantly normally and lightly overconsolidated clay with undrained shear strength increasing with depth.…”

Section: Penetration Resistance: Ldfe Analysesmentioning

confidence: 99%

“…The effect of increasing L is counterbalanced by the increasing amount of trapped softer soil inside the skirt, leading to negligible resultant influence. Hossain et al (2014) used the same numerical model and performed analyses for several case histories (discussed in the following subsection 'Penetration resistance: field data') for simulating actual spudcan geometries with cutouts as well as idealised circular spudcans with (area) equivalent diameter, D eq . The results indicate minimal effect of this idealisation; an example is shown in Fig.…”

Section: Penetration Resistance: Ldfe Analysesmentioning

confidence: 99%

“…The details of numerical implementation of the CEL approach in Abaqus can be found in Qiu & Henke (2011), Qiu & Grabe (2012) and Hossain et al (2014). Only a quarter sector of the soil domain was represented in the analyses, accounting for the inherent symmetry.…”

Section: Numerical Modellingmentioning

confidence: 99%

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Effect of spudcan geometry on penetration and extraction resistance in clay

Hossain¹,

Zheng²,

Huston³

2015

Géotechnique

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Hossain, M. S. et al. Géotechnique [http://dx.Spudcan foundations of various geometries are commonly used in the field for supporting offshore oil and gas drilling (jack-up) rigs. This paper investigates the effect of the spudcan and its base geometry on the penetration and extraction resistance in soft normally and lightly overconsolidated clay. A series of centrifuge tests was undertaken on model spudcans of three different geometries typically used in the field. The spudcans were extracted from penetrations of 2 . 64,3 (area equivalent) diameters and after an operation period of ,19 months. Additional large-deformation finite-element analyses allowed for exploring a range of spudcan base geometries. Corresponding field data were accumulated. The results from this study have confirmed the accuracy of the assumption of a circular conical-based footing and the use of area equivalent diameter for assessing spudcan penetration resistance, as suggested by ISO guidelines 19905-1. Simulation of a flat-based circular plate resulted in 19% higher resistance compared to that of conical-based footings. For spudcans with cutouts and with a peripheral skirt, maximum penetration resistances were, respectively, 14 and 12% lower, and maximum extraction resistances were 20 and 14% lower compared to those for a general spudcan. The corresponding required jack-up leg length was 9 and 7% higher. The effect of peripheral skirt length was shown to be minimal (at least for length relative to spudcan diameter < 0 . 42).

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Encyclopedia of Maritime and Offshore Engineering

Talas¹,

Menachof

Harris³

2017

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Spudcan Penetration Analysis for Case Histories in Clay

Cited by 30 publications

References 18 publications

On the instability of offshore foundations: theory and mechanism

On the instability of offshore foundations: theory and mechanism

Effect of spudcan geometry on penetration and extraction resistance in clay

Encyclopedia of Maritime and Offshore Engineering

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