Numerical modelling of laterally loaded piles driven in low-to-medium density fractured chalk

Pedone, Giuseppe; Kontoe, Stavroula; Zdravković, Lidija; Jardine, Richard J.; Vinck, Ken; Liu, T.

doi:10.1016/j.compgeo.2023.105252

Cited by 12 publications

(12 citation statements)

References 34 publications

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“…Buckley et al (2020) suggested a site-specific correlation between 𝑉 𝑠 measurements and CPT cone resistances 𝑞 𝑡 for low-to-medium density offshore chalk at a Baltic Sea site. However, Matthews et al (2000), Jardine et al (2023a) and Pedone et al (2023) found that stiffnesses inferred from shear wave velocities greatly overestimate the operational stiffnesses developed in field loading tests under even under very low loads. As stated earlier, the operational elastic shear modulus of intact chalk 𝐺 𝑜,𝑖𝑛𝑡𝑎𝑐𝑡 are taken here as one quarter of the geophysical smallstrain shear modulus 𝐺 𝑚𝑎𝑥 to capture the effect of micro-to-macro fissures within the chalk mass.…”

Section: Stiffness Response Of Intact Chalkmentioning

confidence: 96%

“…(2) The shear moduli in the transition Zone B are the most difficult to gauge due to the uncertainty of fissures spacing in this zone. However, parametric studies, employing a preliminary version of the model with explicit treatment of Zone B, showed that ignoring the extra fracturing in this zone makes only minor differences to the prediction of axial pile displacement, even though modelling this feature is crucial to the realistic modelling of laterally loaded piles (see Pedone et al, 2023). The deployment of the operational shear modulus mentioned earlier for the chalk mass is considered to partially cover the effects of fissures in Zone B.…”

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confidence: 99%

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An Axial Load Transfer Model for Piles Driven in Chalk

Wen,

Kontoe,

Jardine

et al. 2023

J. Geotech. Geoenviron. Eng.

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A wide range of onshore and offshore structures are founded on piles driven in chalk, which is encountered under large areas of Northern Europe and other locations worldwide. Their safe and economical design is made difficult by current uncertainties regarding their axial capacity and loaddisplacement behaviour. This paper builds on recent research into the axial capacity of open-ended driven piles by proposing new shaft and base load transfer models for chalk that employ geotechnical properties measured directly in laboratory and in-situ tests. After setting out a new closed-form elastic analysis of the initial tension loading response, a new non-linear shaft model is proposed that captures the radial variation in properties induced by pile installation in chalk and uncouples the piles' stiffness responses from their ultimate local shaft resistances, which are predicted independently. A new base model is also outlined that predicts the loading response based on the chalk's small-strain stiffness and CPT cone resistances. The models are shown to offer good load-displacement predictions for 0.139 m to 1.8 m diameter piles tested between 20 days and 600 days after driving at several sites. Improved reliability and accuracy are demonstrated through comparison with existing load-transfer methods.

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Section: Stiffness Response Of Intact Chalkmentioning

confidence: 96%

mentioning

confidence: 99%

An Axial Load Transfer Model for Piles Driven in Chalk

Wen,

Kontoe,

Jardine

et al. 2023

J. Geotech. Geoenviron. Eng.

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“…Basack et al [22] studied the pile degradation factor with an increasing number of cycles and proposed a 2D finite element model. Other studies have focused on the lateral loads of pile foundations of close-end piles [2,[26][27][28][29][30]. Nevertheless, few studies have focused on the specific behavior of thin-walled open-ended pile foundations under lateral loads [8,31].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Flexural–Torsional Performance of Thin-Walled Open-Ended Steel Vertical Pile Foundations Subjected to Lateral Loads

et al. 2023

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This research investigates the effects of torsional moments on the mechanical behavior of thin-walled open-ended vertical pile foundations subjected to lateral wind loads. The aim of this research is to determine and quantify the errors using traditional design methods and provide more effective alternatives. The warping and torsion effect generated over the piles due to the resultant lateral load impact outside the shear center is analyzed in field tests. Complementarily, a two-dimensional finite element model based on the simple bending stress–strain state, as well as a three-dimensional finite element model considering torsional effects, were implemented and their results analyzed. Finally, a comparative analysis between the in-field lateral loading tests and the finite element model approaches was established by comparing load–displacement curves and using a non-linear Wrinkle model of the soil. Additionally, correlations between the experimental and finite element model errors for the cross-sections pile with a different torsional constant and torsional susceptibility index are shown. From the results, it has been ascertained that the slender thin-walled open-ended pile foundations are particularly sensitive to small load deviations from their center of gravity; this leads to the fact that the slenderer the load and the greater its eccentricity, the more it affects the torsion and warping of the pile. Calculation methodologies usually consider a simple in-plane bending behavior, which leads to errors between 44 and 58% in comparison with the experimental results obtained.

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“…The JIPs advanced five main streams of research: (i) characterising, through advanced testing, the properties of SNW chalk, (ii) driving 43 piles manufactured to a wide range of scales from various steels and reinforced concrete, (iii) conducting systematic and tightly controlled axial-and-lateral, static-and-cyclic load tests, (iv) analysing the results and (v) developing improved practical design procedures. The research was supported by parallel 3D-FE numerical modelling by Pedone et al (2023). Figure 1 gives a plan of the ALPACA and ALPACA Plus testing layout.…”

Section: The Alpaca Jipsmentioning

confidence: 99%

“…High-pressure triaxial testing identified the SNW chalk's highly curved failure envelope, shown in Figure 4, as well as its gradual transition under increasing p′ levels from brittle towards ductile behaviour; Liu et al (2023a). Both features are critically important to numerical modelling of the piles' axial and lateral loading responses, as are (i) the impact of fissures in reducing mass stiffness and (ii) the damage imposed around pile shafts during driving; Pedone et al (2023) and Wen et al (2023a, b).…”

Section: Snw Test Site Conditions and Chalk Characterization Studiesmentioning

confidence: 99%

Driven pile behaviour in low-to-medium density chalk: the ALPACA JIP outcomes

Jardine,

Liu,

Kontoe

et al.

9th International SUT Offshore Site Investigation Geotechnics Conference Proceedings “Innovative Geotechnologies for Energy Tra

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Numerical modelling of laterally loaded piles driven in low-to-medium density fractured chalk

Cited by 12 publications

References 34 publications

An Axial Load Transfer Model for Piles Driven in Chalk

An Axial Load Transfer Model for Piles Driven in Chalk

Experimental and Numerical Flexural–Torsional Performance of Thin-Walled Open-Ended Steel Vertical Pile Foundations Subjected to Lateral Loads

Driven pile behaviour in low-to-medium density chalk: the ALPACA JIP outcomes

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