Penetration Resistance of Offshore Skirted Foundations and Anchors in Dense Sand

Andersen, Knut H.; Jostad, Hans Petter; Dyvik, Rune

doi:10.1061/(asce)1090-0241(2008)134:1(106)

Cited by 109 publications

(57 citation statements)

References 7 publications

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“…Since the platforms were instrumented, it was possible to compare the observed penetration resistance with the cone resistance and to develop empirical factors for short skirts (e.g., Lunne and St. John 1979). Skirt penetration is also an important issue for suction anchors used for floating structures, and empirical CPT-based prediction methods have been developed, although there is a fairly wide range in the empirical factors (Andersen et al 2008 andAas andSaue 2009).…”

Section: Use Of Results For Direct Design Applicationmentioning

confidence: 99%

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

Lunne

2012

Geomechanics and Geoengineering

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For the last 40 years, the CPT has played a key role in offshore soil investigations, mainly in connection with oil and gas development, but also for other purposes. The offshore application of CPT has been an important factor with regards to development of equipment, data processing and interpretation. Each of the following aspects are discussed in terms of historic development, present status and future challenges:-Deployment method and equipment.-Penetrometer design and construction.-Data acquisition, processing and quality control.-Standards and guidelines.-Interpretation of results and application in foundation design. It is shown that these developments have greatly enhanced the reliability and applicability of the use of the CPT in soil investigations and design. However, there are still important challenges to be faced in the future

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Section: Use Of Results For Direct Design Applicationmentioning

confidence: 99%

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

Lunne

2012

Geomechanics and Geoengineering

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“…The specific weight of the solid grains is equal to 26·5 kN/m 3 , the porosity of the soil is 0·36 and its permeability is 5 Â 10 À12 m 2 (corresponding to 5 Â 10 À5 m/s) (Andersen et al, 2008).…”

Section: Numerical Model Geometrymentioning

confidence: 99%

Numerical modelling of transient cyclic vertical loading of suction caissons in sand

2016

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This paper presents numerical investigations of the monotonic and cyclic behaviours of suction caissons upon vertical transient loading. Both drained and partially drained conditions are investigated. Monotonic compression and traction simulations are carried out to qualitatively compare results with the literature and validate the model. They highlight the different modes of reaction of the caisson to both compression and traction loading. A sensitivity analysis points out the strong influence of some parameters on the resistance of the caisson but also on the failure mechanism. The transient behaviour of the caisson upon different kinds of cyclic load signals is analysed. Results reproduce the settlement and pore water pressure accumulations observed during experiments. The influence of the key design parameters on the settlement accumulation is also assessed. Finally a cyclic diagram is proposed to describe the evolution of the final settlement upon different magnitudes of loading.

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“…Abschließend sei noch die am Norwegian Geotechnical Institute (NGI) entwickelte, von A NDERSEN et al [9] beschriebene Methode erwähnt. Sie bietet gleich mehrere Berechnungsansätze an: CPT‐basiert, auf Grundlage effektiver Spannungen und eine Kombination beider Varianten.…”

Section: Analyse Des Installationsprozessesunclassified

“…Die Parameter der Berechnungsansätze sind an einer Vielzahl von Messergebnissen bei der Installation von Prototypen, Feld‐ und Laborversuchen kalibriert worden, wobei sich relativ große Wertebereiche für die kalibrierten Parameter ergaben. Zum Beispiel ergaben sich bei den Rückrechnungen der CPT‐basierten Verfahren Wertebereiche von 0,01 bis 0,6 für k p bei Ansatz von 0,001 bis 0,0015 für k f ([9]).…”

Section: Analyse Des Installationsprozessesunclassified

Installation und Tragverhalten von Bucketgründungen für Offshorebauwerke

Achmus

Schröder

2014

Bautechnik

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Eine Bucketgründung besteht aus einem oder bei aufgelösten Gründungsstrukturen aus mehreren oben geschlossenen Stahlzylindern, welche offshore mittels Abpumpen von Wasser und damit durch Realisierung eines Unterdrucks in den Baugrund bzw. Seeboden eingebracht werden. Diese Installationsmethode, derentwegen auch die Bezeichnung Suction Bucket für dieses Gründungselement verwendet wird, benötigt relativ wenig Aufwand und vermeidet Rammschallemissionen, weshalb die Bucketgründung eine interessante Alternative zu herkömmlichen Offshoregründungen mit Rammpfählen darstellt. Allerdings muss der Installationsvorgang genau berechnet und kontrolliert werden, um einen hydraulischen Grundbruch, Schalenbeulen oder unzulässige Schiefstellung zu vermeiden. Überdies bestehen hinsichtlich des Tragverhaltens von Bucketgründungen insbesondere unter transienten oder zyklischen Belastungen noch offene Fragen. In dem Aufsatz werden Methoden zur Prognose der Eindringwiderstände bei der Installation vorgestellt und beispielhaft für typische Baugrundverhältnisse in der deutschen Nordsee angewandt. Außerdem werden die spezifischen Anforderungen an das Tragverhalten von Bucketgründungen für Offshore‐Windenergieanlagen beschrieben und die diesbezüglichen Kenntnisse, aber auch die noch vorhandenen Kenntnislücken dargestellt. Abschließend werden die Grundzüge eines Dimensionierungskonzepts für Bucketgründungen von Offshore‐Windenergieanlagen vorgestellt und die diesbezüglich noch offenen Fragen diskutiert. Installation and bearing behaviour of bucket foundations for offshore structures A bucket foundation consists of one or, in case of a jacket or tripod structure, of three or four steel cylinders with a steel lid on top, which is installed offshore by pumping water and thus inducing underpressure below the lid. This installation method, which is the reason for the often used term 'suction bucket', is rather simple and avoids driving noise emissions. This makes it an interesting alternative to usual offshore foundations with driven piles instead of buckets. However, the installation process must be accurately calculated and controlled to avoid hydraulic failure, buckling and inadmissible rotations. Moreover, open questions regarding the bearing behavior of bucket foundations particularly under transient or cyclic loads exist. The paper firstly presents methods for the prediction of penetration resistances during installation and applies them exemplarily for typical soil conditions of the German North Sea. Secondly, the specific requirements on the behavior of buckets for offshore wind energy converter foundations are described and the respective state of knowledge is outlined. Finally, the basics of a general design concept for buckets as foundation elements of offshore wind energy converters are presented and open questions are discussed.

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Penetration Resistance of Offshore Skirted Foundations and Anchors in Dense Sand

Cited by 109 publications

References 7 publications

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

Numerical modelling of transient cyclic vertical loading of suction caissons in sand

Installation und Tragverhalten von Bucketgründungen für Offshorebauwerke

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