Negative Skin Friction on Piles: State of the Art

Rituraj, Sujawat Singh; Rajesh, B. Giridhar

doi:10.1007/978-981-16-1993-9_34

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…The development of negative skin friction requires small relative movements (about 5 mm) between the soil and pile (Rituraj and Rajesh 2022). The medium shaking events (EQM 2 and EQM 4 ), even though they did not fully liquefy the loose sand layer (r u ≈ 50%), resulted in the development of negative skin friction and thus drag load on piles (Figs.…”

Section: Discussion On Drag Loadsmentioning

confidence: 99%

Centrifuge Model Tests of Liquefaction-Induced Downdrag on Piles in Uniform Liquefiable Deposits

Sinha

Ziotopoulou

Kutter

2022

J. Geotech. Geoenviron. Eng.

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Earthquake-induced soil liquefaction can cause settlement around piles, which can translate to negative skin friction and the development of drag load and settlement of the piles. A series of centrifuge model tests were performed to assess liquefaction-induced downdrag and understand the interplay and effects of (1) pile embedment and pile-head load, (2) excess pore pressure generation and dissipation, and (3) reconsolidation and ground settlement on pile response during and postshaking. The model included a layered soil profile (clay, liquefiable sand, and dense sand) with two 635-mm-diameter instrumented piles. One pile was placed with its tip at the bottom of the liquefiable deposit; the other pile was embedded five diameters into the dense sand layer. The model was shaken with multiple earthquake motions with their peak horizontal accelerations ranging from 0.025 to 0.4 g. For each shaking event, the drag load on the piles first decreased during shaking and then increased during reconsolidation, exceeding its preshaking value. With multiple shaking events, the net drag load on the piles increased. The maximum observed drag load was found equal to the drained interface shear strength calculated from the interface friction angle of δ ¼ 30°and a lateral stress coefficient of K ¼ 1. Larger drag loads and smaller settlements were observed for the pile embedded deep in the dense sand layer. Most of the pile settlements occurred during shaking; postshaking pile settlement was less than 2% of the pile's diameter. The mechanisms behind the development of liquefaction-induced drag load on piles and settlements are described. Select ramifications concerning the design of piles in liquefiable soils are also described.

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Section: Discussion On Drag Loadsmentioning

confidence: 99%

Centrifuge Model Tests of Liquefaction-Induced Downdrag on Piles in Uniform Liquefiable Deposits

Sinha

Ziotopoulou

Kutter

2022

J. Geotech. Geoenviron. Eng.

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“…Several methods are currently available for predicting NSF, such as the empirical method [9,10], the finite element method (FEM) [11,12], the elastic continuum theory [13,14] and the load transfer method [15,16]. Field and model tests have shown that skin friction is determined by the relative displacement of the pile-soil interface [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for Negative Skin Friction in Offshore Wind Power Pile Foundations on Artificial Islands under the Influence of Soil Consolidation

Chong

Shi

Pang

2023

JMSE

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The construction of offshore wind power pile foundations on artificial islands is a challenging task due to soil consolidation and additional loads that result in negative skin friction (NSF). In this study, a comprehensive pile–soil interaction model is established to investigate the development of NSF in artificial islands under the action of self-weight consolidation of fill soil and surcharge load. The one-dimensional consolidation theory and an ideal elastoplastic load transfer model are employed to obtain the analytical solution for skin friction and axial force of the pile with respect to time and depth. The predicted results are in good agreement with the field tests and finite element methods. Finally, a parametric study is conducted to investigate the effect of pile installation time, surcharge load, and pile head load on the development of NSF.

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Liquefaction-Induced Downdrag on Piles: Insights from a Centrifuge and Numerical Modeling Program

Ziotopoulou

Sinha

Kutter

2022

Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 202

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Negative Skin Friction on Piles: State of the Art

Cited by 4 publications

References 27 publications

Centrifuge Model Tests of Liquefaction-Induced Downdrag on Piles in Uniform Liquefiable Deposits

Centrifuge Model Tests of Liquefaction-Induced Downdrag on Piles in Uniform Liquefiable Deposits

Analytical Solution for Negative Skin Friction in Offshore Wind Power Pile Foundations on Artificial Islands under the Influence of Soil Consolidation

Liquefaction-Induced Downdrag on Piles: Insights from a Centrifuge and Numerical Modeling Program

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