Database Assessment of CPT-Based Design Methods for Axial Capacity of Driven Piles in Siliceous Sands

Schneider, James; Xu, X.; Lehane, Barry

doi:10.1061/(asce)1090-0241(2008)134:9(1227)

Cited by 78 publications

(22 citation statements)

References 24 publications

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“…The ICP set reported by Jardine et al (2005) added a significant number of new case histories to those assembled by Lehane & Jardine (1994) and Chow (1997), and offered a total of 83 tests in sand. Schneider et al (2008) augmented the ICP tests, adding 26 previously unrecognised entries. The UWA team also applied further quality filters, such as excluding any tests without full CPT profiles.…”

Section: Databases For Piles Driven In Sandsmentioning

confidence: 99%

“…Rigorous database studies have become key tools to assess the potential efficacy of these new design procedures. Lehane & Jardine (1994), Chow (1997), Clausen et al (2005), Jardine et al (2005), Kolk et al (2005) and Schneider et al (2008) all assembled databases to test their new CPT-based design procedures in comparison with the offshore industry-standard 'Main Text' American Petroleum Institute RP2GEO (API, 2014) approach and its forebears. They found that the Main Text approach was subject to surprisingly high overall coefficients of variance (CoVs) in Q c /Q m (up to 0?88) when predicting compression capacity in sand and that the new procedures led to lower CoVs and less bias with respect to pile geometry (diameter (D) and L/D ratio (L 5 embedded length)), loading sense (tension or compression) and sand relative density (D r ).…”

Section: Introductionmentioning

confidence: 99%

“…The most comprehensive sets appear to be those assembled by Chow (1997) and later updated by Jardine et al (2005), termed here the ICP database, and that published by Schneider et al (2008), which is here referred to as the UWA database. Taken together, these include over 100 different piles driven in silica sand and tested to failure.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new and openly accessible database of tests on piles driven in sands

Yang

Jardine

Guo³

et al. 2015

Géotechnique Letters

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This paper reviews the critical need to develop better load test databases for piles driven in sand before reporting on the significantly augmented, openly accessible, Zhejiang University/Imperial College London (ZJU-ICL) database. Key quality parameters, the population of current entries and the reporting format are described before offering preliminary results obtained from comparisons between axial capacities calculated by various predictive approaches and site measurements. The results confirm that the offshore industry-standard 'Main Text' American Petroleum Institute RP2GEO procedures are less reliable and have larger coefficients of variation than alternative cone penetration test (CPT) methods, among which the ICP (Imperial College piles) and UWA (University of Western Australia) procedures appear to give the least bias and scatter. It is also shown that the 'simplified' ICP variant proposed by some practitioners is over-conservative and that its use could be discontinued. The new pile capacity and stiffness database offers broad scope for evaluating potential prediction biases relating to a wide range of soil and pile parameters. The submission of further high-quality tests for inclusion in regularly updated versions of the ZJU-ICL database is encouraged.

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Section: Databases For Piles Driven In Sandsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new and openly accessible database of tests on piles driven in sands

Yang

Jardine

Guo³

et al. 2015

Géotechnique Letters

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show abstract

“…Despite the simplicity of the lateral earth pressure approach, the use of a constant K f value implies a linear relationship between local shear stress and vertical effective stress, which is in contrast with observations of shaft resistance during loading of instrumented displacement piles in the field (Randolph et al 1994). Furthermore, reviews of pile design methods over the years have highlighted the relatively poor performance of earth pressure methods in predicting displacement pile capacity (Briaud and Tucker 1988;Toolan et al 1991;Schneider et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The various high-quality studies of displacement pile behaviour in sand conducted in recent years have led to the development of several CPT-based design methods which have been shown to provide improved predictions of shaft capacity for displacement piles in sand in comparison to traditional design methods (Jardine et al, 2005;Schneider et al 2008). For example, the University of Western Australia UWA-05 method (Lehane et al 2005b) recommends the use of Equations 2, 3 and 4 to estimate the shaft resistance of closed-ended displacement piles in siliceous sand.…”

Section: Introductionmentioning

confidence: 99%

Shaft resistance of driven cast-in-situ piles in sand

Flynn

McCabe

2016

Can. Geotech. J.

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Driven cast-in-situ (DCIS) piles are classified as a large displacement pile, despite sharing certain aspects of their construction with replacement pile types. However, there are relatively few case histories of load tests on DCIS piles in the literature to verify the assumption that they behave as large displacement piles. In particular, the shaft resistance of DCIS piles in sand is uncertain due to the complex interaction between the freshly cast concrete and surrounding displaced soil after extraction of the steel installation tube. This paper describes the installation, curing, and maintained compression load testing of three temporary-cased DCIS test piles at a uniform sand site near Coventry, United Kingdom. The piles were instrumented with vibrating wire strain gauges to enable accurate measurement of the local shear stress generated on the pile shaft during maintained compression loading. The tests showed that the peak average and local shear stresses tended to mobilize at greater shaft displacements than traditional preformed displacement piles during loading. A clear reduction in normalized local shear stresses (and hence radial effective stress) at failure with distance from the pile base, i.e., friction fatigue, was evident for all piles, implying that radial stresses generated during driven installation of the steel tube are not erased upon concreting and tube withdrawal. Furthermore, the inferred normalized radial effective stresses at failure were remarkably similar to those reported for traditional preformed displacement piles in the literature.

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Pile Foundations: Design for Axial and Lateral Loading

Randolph

Schneider

2018

Encyclopedia of Maritime and Offshore Engineering

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This article summarizes design methods for pile foundations subjected to axial and lateral loading. It addresses the main factors that need to be considered in a basis of design, focusing on driven steel pipe piles, which are almost universally used in offshore practice. The response of less frequently used piles grouted into stronger sediments, such as calcarenite and other weak rock, is also considered. Modern design approaches based on data from cone penetration testing are outlined. For lateral response, the main focus is on load transfer methods. Reference is also made to elastic solutions that can provide a useful approach for operational loading, particularly for large diameter monopiles such as are used in the offshore wind industry. Just as for axial loading, the potential use of cone penetration data as the basis for deriving lateral load transfer curves is also discussed. Underlying principles of the effects of cyclic loading are presented. The article concludes with brief comments on scour and seismic design, two other considerations for the design of offshore piles.

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Database Assessment of CPT-Based Design Methods for Axial Capacity of Driven Piles in Siliceous Sands

Cited by 78 publications

References 24 publications

A new and openly accessible database of tests on piles driven in sands

A new and openly accessible database of tests on piles driven in sands

Shaft resistance of driven cast-in-situ piles in sand

Pile Foundations: Design for Axial and Lateral Loading

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