DEM study of particle scale and penetration rate on the installation mechanisms of screw piles in sand

Cerfontaine, Benjamin; Ciantia, Matteo Oryem; Brown, Michael; Sharif, Yaseen

doi:10.1016/j.compgeo.2021.104380

Cited by 23 publications

(13 citation statements)

References 47 publications

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“…This behaviour is consistent with previous single helix pile behaviour (Cerfontaine et al, 2021a). It was shown numerically that helix overflighting forces sand particles to move upwards (Cerfontaine et al, 2021b). However, the surrounding soil opposes this upwards movement and the reaction force acting on the helix creates tension in the pile (pull-in force).…”

Section: Resultssupporting

confidence: 90%

“…This enhancement of capacity and stiffness can again be explained by the overflighting movement of the helix, which enhances soil density and the stress field above the helix and has the opposite effect underneath the helix. The effect on the pile shafts was not measured, but it could be expected that overflighting increases the radial stress magnitude, hence the shaft vertical resistance (Cerfontaine et al, 2021b;Sharif et al, 2021b). The pile behaviour only exhibits a well-defined peak in tension, hence the pile resistance (denoted 𝐹𝐹 𝑧𝑧,𝑟𝑟 ) was calculated as the maximum force measured within 0.1D h displacement.…”

Section: Resultsmentioning

confidence: 99%

“…The prediction of pile axial capacity is depicted in Figure 5 (Cerfontaine et al, 2021b) or loading (Sharif et al, 2021b(Sharif et al, , 2021a of screw piles can be used to enrich experimental findings and develop physically-based prediction methods. Finally, installation in the field will be undertaken at constant vertical force (pile and tool weight), with the AR adapting to maintain the vertical equilibrium.…”

Section: Resultsmentioning

confidence: 99%

“…The proposed method gives an estimate for pile resistance, but more results are necessary to determine accurate AR correction factors. Firstly, pile jacking or helical pile embedment leads to different mechanisms during installation (seeCerfontaine et al (2021b)). Secondly, the AR effect on the helix or the shaft resistances are probably different and function of many parameters, such as the embedment depth and pile and helix geometric properties.…”

mentioning

confidence: 99%

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Optimised screw pile design for offshore jacket foundations in medium–dense sand

Cerfontaine

Brown

Davidson

et al. 2022

Géotechnique Letters

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Screw piles are well suited foundations for offshore jacket structures, as they can be installed without significant underwater noise and have a large axial capacity. However, installation requirements for such large piles must be reduced to enable their installation in the field. This work combines geometry and installation optimisation to lower force and torque installation requirements. An original pile geometry, composed of a large diameter upper section connected to a smaller diameter lower section by a transition piece, was tested in a geotechnical beam centrifuge. The advancement ratio (AR), describing the relative vertical movement per pile rotation, was varied below the threshold usually recommended. Results show that a low AR reduces the pile penetration resistance and even generates some pull-in, while the torque remains almost unaffected. The torque is mainly associated with the upper section of the pile, which has a greater diameter to resist lateral loading in service. The pile capacity in tension generally increases as AR is reduced and reaches a maximum for AR = 0.5, while the compressive capacity reduces. It was shown that a simplified method can be used to estimate pile capacity, providing that some AR dependent reduction factors can be calculated or assumed.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Optimised screw pile design for offshore jacket foundations in medium–dense sand

Cerfontaine

Brown

Davidson

et al. 2022

Géotechnique Letters

Self Cite

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“…The Distinct Element Method (DEM) is capable of changing the particle-scale properties and is therefore suitable for the investigation of scale effects (e.g. Athani et al, 2017;Cerfontaine et al, 2021). However, in general, there exists a limitation on the total number of particles for obtaining DEM simulation results within a reasonable computational time.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical study of potential scale effects in small-scale modelling of sinker tree roots

Zhang¹,

Ciantia²,

Knappett³

et al. 2021

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When testing an 1:N geotechnical structure in the centrifuge, it is desirable to choose a large scale factor (N) that can fit the small-scale model in a model container and avoid unwanted boundary effects, however, this in turn may cause scale effects when the structure is overscaled. This is more significant when it comes to small-scale modelling of sinker root-soil interaction, where root-particle size ratio is much lower. In this study the Distinct Element Method (DEM) is used to investigate this problem. The sinker root of a model root system under axial loading was analysed, with both upward and downward behaviour compared with the Finite Element Method (FEM), where the soil is modelled as a continuum in which case particle-size effects are not taken into consideration. Based on the scaling law, with the same prototype scale and particle size distribution, different scale factors/g-levels were applied to quantify effects of the ratio of root diameter (𝑑𝑟) to mean particle size (𝐷50) on the root rootsoil interaction.

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Development and Application of Static Load Test System for Pile Foundation Based on Steel Screw Anchor Piles

Zhou,

Yang,

Sun

et al. 2024

KSCE J Civ Eng

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DEM study of particle scale and penetration rate on the installation mechanisms of screw piles in sand

Cited by 23 publications

References 47 publications

Optimised screw pile design for offshore jacket foundations in medium–dense sand

Optimised screw pile design for offshore jacket foundations in medium–dense sand

Micromechanical study of potential scale effects in small-scale modelling of sinker tree roots

Development and Application of Static Load Test System for Pile Foundation Based on Steel Screw Anchor Piles

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