Shear Strength Along Inside of Suction Anchor Skirt Wall in Clay

Andersen, Knut H.; Jostad, Hans Petter

doi:10.4043/16844-ms

Cited by 58 publications

(45 citation statements)

References 3 publications

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“…The skin friction term is thus very dependent on the interface roughness term, a, which is di‹cult to calculate (e.g., Anderson and Jostad, 2004). It will become an increasing proportion of the total foundation capacity as the embedment ratio increases and hence is a key research topic for suction caisson foundations (e.g., Anderson and Jostad, 2004).…”

Section: Results: Embedded Foundation In Uniform Soilmentioning

confidence: 99%

“…If the above information was not available, design practice (e.g., Anderson and Jostad, 2004) is to use a＝1 W St during installation, but a larger a value after set-up time because of consolidation and thixotropic issues. For kaolin, sensitivity, St＝2 to 2.5, again suggesting the use of a＝0.4 to 0.5 for the centrifuge bearing capacity test calculations.…”

Section: Test Resultsmentioning

confidence: 99%

“…It will become an increasing proportion of the total foundation capacity as the embedment ratio increases and hence is a key research topic for suction caisson foundations (e.g., Anderson and Jostad, 2004).…”

Section: Results: Embedded Foundation In Uniform Soilmentioning

confidence: 99%

See 2 more Smart Citations

The Undrained Vertical Bearing Capacity of Skirted Foundations

Yun

Bransby

2007

Soils and Foundations

101

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Section: Results: Embedded Foundation In Uniform Soilmentioning

confidence: 99%

Section: Test Resultsmentioning

confidence: 99%

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The Undrained Vertical Bearing Capacity of Skirted Foundations

Yun

Bransby

2007

Soils and Foundations

101

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“…Kaolin clay has successfully been used in centrifuge testing for studying various offshore geotechnical engineering settings and processes in the GoM seabed soils (e.g. Andersen & Jostad, 2004;Jeanjean et al, 2006;Oliviera & Almeida, 2010;Clukey et al, 2011). Although GoM clay and kaolin clay differ in predominant clay mineral, kaolin clay requires significantly shorter in-flight consolidation time and is more homogeneous in nature, making it more attractive for research purposes.…”

Section: Centrifuge Testing Programme Model Scaling Considerationsmentioning

confidence: 99%

Long-term axial capacity of deepwater jetted piles

Zakeri¹,

Liedtke²,

Clukey³

et al. 2014

Géotechnique

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Jetting is a technique commonly used to install well conductors, which is faster than the conventional drill and cement method. Conductors are designed to support the buoyed weight of the first string of casings (typically, 3-5 days after jetting) and later to provide the lateral stability for the well system against cyclic loading from environmental elements. The axial bearing capacity of a jetted conductor increases with time due to consolidation and thixotropy effects; however, the field data for set-up only extend to about 10 days. Installation of jetted conductors as piles and anchors may be an economic solution for offshore developments. The long-term axial capacity of jetted conductors was investigated through a series of centrifuge modelling and laboratory thixotropy testing. The centrifuge tests simulated jetting installation of four model conductors and measured capacities at set-up times ranging between 10 and 1000 days in a kaolin clay seabed with an undrained shear strength profile similar to that encountered in deepwater Gulf of Mexico. The centrifuge test results were compared to the field data in the Gulf of Mexico. The implications of the centrifuge test results for deepwater Gulf of Mexico conditions are discussed. A method is presented for estimating the long-term axial capacity of jetted conductors in Gulf of Mexico seabed conditions with recommendations for additional studies.

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“…The soil-structure interfaces allow for full tension and an interface shear strength reduction factor α = 0·65 was used in all analyses. Reference is made to Andersen & Jostad (2002) and Chen & Randolph (2007) for details on the topic of interface strength. Fig.…”

Section: Three-dimensional Fe Model and Analysesmentioning

confidence: 99%

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

2018

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Skirted foundations have been widely applied as offshore foundations for several decades. In design, the use of failure envelopes is convenient for assessing stability under combined loading. A large number of studies on failure envelopes exist in the literature based on experiments and numerical analyses. Most of these studies focus on ultimate capacity and static loading. This paper presents a numerical study focusing on cyclic degradation and failure envelopes for skirted foundations subjected to combined cyclic and static loading. It was found that the shapes of the failure envelopes are little affected by degradation expressed by the number of equivalent cycles. In addition to failure envelopes, contours of displacements were computed in the three-dimensional load space (vertical, horizontal and moment load) for a more complete description of the response. As an example, the well-defined cyclic contour diagrams of Drammen clay were utilised to demonstrate how foundation response diagrams can be established. The database is accompanied by a simplified procedure to account for cyclic degradation through equivalent number of cycles, different normalised load-displacement response and variation in foundation geometry. The framework of procedures can be used to estimate foundation stiffness and capacity and the results can serve as a basis for the development of foundation macro-element models.

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Shear Strength Along Inside of Suction Anchor Skirt Wall in Clay

Cited by 58 publications

References 3 publications

The Undrained Vertical Bearing Capacity of Skirted Foundations

The Undrained Vertical Bearing Capacity of Skirted Foundations

Long-term axial capacity of deepwater jetted piles

A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading

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