Field axial cyclic loading experiments on piles driven in sand

Jardine, Richard J.; Standing, J. R.

doi:10.1016/j.sandf.2012.07.012

Cited by 95 publications

(59 citation statements)

References 6 publications

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“…Poulos, 1988;Jardine & Standing, 2012). For offshore structures, which are invariably subjected to cyclic motion induced by wind and wave loading, the assessment of the piled foundation performances under cyclic loading is often the leading aspect of the design process.…”

Section: Introductionmentioning

confidence: 99%

Performance of cyclic cone penetration tests in chalk

Diambra¹,

Ciavaglia²,

Harman³

et al. 2014

Géotechnique Letters

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This paper presents results from a preliminary testing campaign to explore the feasibility and benefits of performing cyclic cone penetration tests with measurement of pore pressure (CPTu) in chalk. The CPTu's cone is a miniature driven pile and this technique permits the monitoring of degradation of sleeve friction and pore pressure development during cyclic loading. It was found that while consistent degradation of measured sleeve friction takes place within a few cycles, this was not associated with an observed pore pressure build up. However, uncertainties about the pore pressure measurements arose because the remoulded chalk next to the cone was probably unsaturated and also the pore pressure transducer was positioned close to the tip of the cone. Analysis of the results suggests that the technique may have promising potential to increase understanding of the underlying mechanisms and aid the design of axially loaded driven piles in chalk. Nevertheless further validation and development would be necessary in the future.

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Section: Introductionmentioning

confidence: 99%

Performance of cyclic cone penetration tests in chalk

Diambra¹,

Ciavaglia²,

Harman³

et al. 2014

Géotechnique Letters

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“…They also provided insights into the interface shear behaviour and sand mass response to cyclic pile loading. Jardine and Standing (2012) applied a similar scheme in interpretation of their field tests at Dunkerque (Figure 2 …”

Section: Introductionmentioning

confidence: 99%

“…A first-stage screening process for axial cyclic design is described in Figure 3 by plotting on the Dunkerque cyclic interaction diagram (Jardine and Standing, 2012) the most critically loaded piles from the range of storm conditions on the platforms listed in Table 1. In this simplified treatment it is assumed that all the piles were designed to give working stress design (WSD) factors of safety (FoS) of 1 .…”

Section: Introductionmentioning

confidence: 99%

Displacement response to axial cycling of piles driven in sand

Rimoy

Jardine

Standing

2013

Proceedings of the Institution of Civil Engineers - Geotechnica

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A review of the load applied to multi-pile offshore wind turbine foundations is presented, from which the need to consider the response to axial cyclic loading is emphasised. The paucity of available data on field tests on driven piles in sand is noted. A comprehensive data set of multiple axial cyclic and static tests conducted on seven industrial-scale steel pipe-piles at a marine sand site in Dunkerque, France, is re-examined in this paper. The effects of cycling on axial capacity are interpreted by reference to stable, metastable or unstable zones defined in a normalised cyclic stability interaction diagram. A detailed analysis is made of the load-displacement and stiffness response associated with each mode of cycling. It is shown that in all cases the piles' cyclic stiffnesses show only minor changes until cyclic failure is approached. The patterns of permanent cyclic strain accumulation are sensitive to the applied mean and cyclic loading levels. Whereas displacements accumulate rapidly over just a few cycles in the unstable zone, extended cycling in the stable zone leads to minimal accumulated displacements and constant transient cyclic displacements.

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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). The main considerations in sands and clays are summarized below.…”

Section: Research Programmesmentioning

confidence: 99%

“…The impact on axial pile capacity was assessed using a simplified global approach based on field tests at Dunkirk in North Sea sands. Following Jardine and Standing (2012), only cycles with amplitudes greater than a defined cyclic damage limit were considered in the analysis and an 'equivalent number' approach applied with Equation 2. Cyclic axial loading was found to reduce the static axial pile capacity by up to 25% at the locations with the lowest shaft capacities.…”

Section: Fig 4 Measured and Design Cpt Profiles For Two Turbine Locmentioning

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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Field axial cyclic loading experiments on piles driven in sand

Abstract: 09.01.15 KB. Ok to add accepted version to spiral, embargo period expired

Cited by 95 publications

References 6 publications

Performance of cyclic cone penetration tests in chalk

Performance of cyclic cone penetration tests in chalk

Displacement response to axial cycling of piles driven in sand

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

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