Axial Capacity of Offshore Piles in Dense North Sea Sands

Jardine, Richard J.; Overy, Robert; Chow, Fiona

doi:10.1061/(asce)1090-0241(1998)124:2(171)

Cited by 49 publications

(27 citation statements)

References 16 publications

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“…The capacity reported by Jardine et al (1998), for this test performed 80 days after driving, is close to that predicted by the ICP approach advocated by Jardine et al (2005), whereas our paper indicates that, on average, ICP calculations match shaft capacities developed at an earlier stage (around 10 days). Our reply considers whether this single observation calls into question our paper's conclusions.…”

Section: Authors' Replysupporting

confidence: 90%

“…The Leman test remains valuable as our sole North Sea sand offshore test, and it is worthwhile considering whether any additional factors might have applied that were not recognised in the earlier interpretation offered by Jardine et al (1998) All 12 conductors are recorded as extending down to about 38 m penetration around one month later when gas well drilling operations commenced. Unfortunately, it is not clear when this was done, or whether 10 ten 'refusing' conductors had been driven on to their final depths using a more powerful hammer, or whether a drill-drive technique had been applied.…”

Section: Authors' Replymentioning

confidence: 99%

“…17. CPT q c profile for Leman BD site and design profile (Jardine et al, 1998) unique intact ageing characteristic (IAC), even for similar sand types and pile characteristics. ( j) The ICP procedures tend to match well at Dunkirk at 10 days, but for Leman BD at 80 days.…”

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Discussion: Some observations of the effects of time on the capacity of piles driven in sand

2007

Géotechnique

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Section: Authors' Replysupporting

confidence: 90%

Section: Authors' Replymentioning

confidence: 99%

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Discussion: Some observations of the effects of time on the capacity of piles driven in sand

2007

Géotechnique

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“…[25,26]) or consider the effect indirectly by expressing K as a decreasing function of the distance from the pile tip (e.g. [4,27,28]). The soil at the pile tip elevation experiences only one cycle.…”

Section: Friction Fatigue For Jacked Pilesmentioning

confidence: 99%

Analysis of shaft resistance of jacked piles in sands

Basu

Loukidis

Prezzi

et al. 2010

Num Anal Meth Geomechanics

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SUMMARYIn recent years, pile jacking has become a viable alternative installation method for displacement piles. Pile jacking produces minimal noise, vibration and air pollution during installation. In addition, it is possible, at the end of jacking, to have a good estimate of the ultimate static capacity of the pile. In this paper, the shaft resistance of piles jacked into sand is studied using one-dimensional finite element analysis. The finite element simulations, using a two-surface plasticity model, demonstrate the effects of relative density and confinement on the unit shaft resistance of piles jacked in sand. The impact of the number of jacking strokes on the unit shaft capacity is also assessed. Based on the numerical results, we developed equations for shaft resistance quantifying the effects of relative density, initial confinement and number of jacking strokes. Predictions using these equations are compared with data obtained from centrifuge tests and field tests.

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“…The background research and design methods developed from it are summarized by Jardine et al (2005), who cite multiple earlier references including Jardine et al (1998), Saldivar and Jardine (2005) and Jardine et al (2006) which present full details of the methods. Further investigations of the effects of time on the axial capacity of piles driven in sand are described by Jardine et al (2006) and those concerning cyclic loading effects by Jardine & Standing (2012).…”

Section: Research Programmesmentioning

confidence: 99%

The ICP Design Method and Application to a North Sea Offshore Wind Farm

Jardine

Merritt²,

Schroeder³

2015

Ifcee 2015

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This paper outlines the Imperial College Pile (ICP) approach for developing reliable predictions for the axial capacity of driven piles. The ICP's advantages over traditional design methods have led to widespread use in offshore oil and gas developments. The methods are now playing a critical role in major Northern European offshore wind projects. Hundreds of large steel tubular piles are being driven in the North and Baltic seas and improving design efficiency is crucial to the industry's economic success. This paper provides an overview of the development of the ICP design methods and summarizes their key features, together with experience-based guidance on their application. Their application is illustrated by reference to the North Sea Borkum West II wind farm, where 40 turbines have been installed on steel tripods founded on large diameter steel piles driven in very dense sands. The paper reports how the significant effects of axial and lateral cyclic loading were addressed for Borkum West II through the ICP design methodology.

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Axial Capacity of Offshore Piles in Dense North Sea Sands

Cited by 49 publications

References 16 publications

Discussion: Some observations of the effects of time on the capacity of piles driven in sand

Discussion: Some observations of the effects of time on the capacity of piles driven in sand

Analysis of shaft resistance of jacked piles in sands

The ICP Design Method and Application to a North Sea Offshore Wind Farm

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