Stress-path laboratory tests to characterise the cyclic behaviour of piles driven in sands

AghaKouchak, Amir; Sim, W.W.; Jardine, Richard J.

doi:10.1016/j.sandf.2015.08.001

Cited by 32 publications

(30 citation statements)

References 17 publications

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“…The calibration process is lengthy as several parameters employed by the model lack clear physical meaning and have to be estimated indirectly.As in the Cowden case, the model was calibrated from the available field (Chow 1997) and laboratory experiments (Sim et al 2013, Aghakouchak 2015.…”

Section: Soil At Dunkirkmentioning

confidence: 99%

Numerical modelling of large diameter piles under lateral loading for offshore wind applications

Zdravković

Taborda

Potts

et al. 2015

Frontiers in Offshore Geotechnics III

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There is currently a significant focus on developing offshore wind power in the UK and Europe. The most common foundation type for wind turbines is a single large diameter pile, termed a monopile, on which the turbine is located. As the diameter of such piles is envisaged to increase in future installations, there are concerns that current design methods are not applicable. To explore this problem, the joint industry project PISA has been established, with the aim to develop a new design framework for laterally loaded piles utilised in the offshore wind industry, based on new theoretical developments, numerical modelling and large scale field pile testing. This paper presents an overview of numerical modelling undertaken as part of the project.

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Section: Soil At Dunkirkmentioning

confidence: 99%

Numerical modelling of large diameter piles under lateral loading for offshore wind applications

Zdravković

Taborda

Potts

et al. 2015

Frontiers in Offshore Geotechnics III

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“…Aghakouchak et al (2015) show that applying larger ageing, overconsolidation and/or drained pre-cycling can improve the behaviour of soils under any subsequent cyclic loading. Highway construction procedures that apply any such measures may be effective in reducing the in-service settlement performance problems described in this paper's introduction.…”

Section: Vertical Permanent Deformationsmentioning

confidence: 91%

Stress–strain response of soft clay to traffic loading

et al. 2017

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Approximately 25% of China's 120 000 km of expressway, as well as many new metro lines and airports, rest on soft clay deposits. However, service settlements are proving larger than expected, especially in southeast China. This note describes laboratory experiments on K 0 -consolidated intact samples of soft clay taken near Wenzhou, south-east China, that explore whether cyclic traffic wheel loading contributes significantly to the observed settlement trends. Cyclic triaxial (CT) tests are reported together with cyclic hollow cylinder (CHCA) experiments that imposed cardioid-shaped 2τ zθ À (Δσ z À Δσ θ ) stress paths. Cyclic principal stress axis rotation is shown to have an important influence on vertical straining. Once a certain threshold has been exceeded, the resilient and permanent strains developed in the CHCA tests become progressively larger than their counterparts in CT tests conducted at the same vertical cyclic stress ratio, with trends that diverge progressively as vertical cyclic stress ratio increases. Critical cyclic stress ratios can be defined that divide the response into (a) stable, (b) metastable and (c) unstable cyclic ranges. The novel experimental approach and high-quality data reported should aid practitioners and modellers in developing new analyses to address this economically significant geotechnical problem.

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“…Many authors observed that shaft friction degradation phenomenon increased as the constant normal stiffness increased (Poulos, 1988;Tabucanon et al, 1995;Fakharian and Evgin, 1997;Mortara et al, 2007;Liu et al, 2012;Pra-ai and Boulon, 2016). For achieving practical results, cyclic interface shear tests should be conducted under a confinement condition that match the field condition (Jardine et al, 2005;Aghakouchak et al, 2015).…”

Section: Constant Normal Stiffness Conditionmentioning

confidence: 99%

“…However, these authors concluded that grouted piles are more susceptible to shaft friction degradation Poulos, 1991, 1992). Many studies pointed out that the installation procedure is a key point to understand the pile behavior under cyclic loading Poulos, 1991, 1992;Aghakouchak et al, 2015;Blanc and Thorel, 2016). Figure 3.9: Effect of normalized roughness on the interface cyclic response.…”

Section: Surface Structural Characteristicsmentioning

confidence: 99%

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The shaft friction degradation of piles under cyclic axial loading in wind turbine foundations.

Nardelli¹

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Catalogação-na-publicação ACKNOWLEDGMENT I would like to express my deepest gratitude to my supervisor, Professor Marcos Massao Futai, for his encouragement and guidance during the past two years. I would like to acknowledge the committee members of this dissertation, Professor Cristina de Hollanda Cavalcanti Tsuha and Professor Marcio de Souza Soares de Almeida for their contributions. I am also very thankful to the Geotechnical Engineering Research Group (GeoInfraUSP) whose support has enabled me to grow professionally and overcome several challenges. I would like to thank all my GeoInfraUSP colleagues for their assistance and friendship. I would like to express my thanks to the Brazilian Association of Wind Energy for sharing the Brazilian wind farm statistics database. I am also very grateful to all the wind energy companies and foundation designers who actively participated in this research: Alupar,

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Stress-path laboratory tests to characterise the cyclic behaviour of piles driven in sands

Cited by 32 publications

References 17 publications

Numerical modelling of large diameter piles under lateral loading for offshore wind applications

Numerical modelling of large diameter piles under lateral loading for offshore wind applications

Stress–strain response of soft clay to traffic loading

The shaft friction degradation of piles under cyclic axial loading in wind turbine foundations.

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