Behavior of Pile Subject to Negative Skin Friction and Axial Load

Leung, C.F.; Liao, Baochen; Chow, Y. K.; Shen, Rui; Kog, Yue Choong

doi:10.3208/sandf.44.6_17

Cited by 59 publications

(31 citation statements)

References 3 publications

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“…15 postulated that for end bearing piles the neutral plan is located very close to the bottom boundary of clay layer, while in floating piles the neutral plan is located at depth about 80% of pile length below the top clay surface. This finding is in agreement with Ng et al [41] and Leung et al [38], Ng et al [42], and in contrary with Lv et al [39]. The figure shows that the long term dragload decreased as the pile head load increased due to the decrease in relative displacement between pile and soil.…”

Section: Effect Of Pile Tip Location On the Dragloadsupporting

confidence: 74%

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Behaviour of single pile in consolidating soil

Abdrabbo

Ali

2015

Alexandria Engineering Journal

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Piles located in consolidating soil are subjected to indirect loading resulted from the settlement of adjacent soil. Both pile and soil undergo downward movements caused by the axial pile load and surcharge loading on surrounding area. Both dragload and downdrag imposed on the pile are time dependent. The purpose of this research was to analyse and quantify the dragload and down drag imposed on single pile. Effect of pile head load was considered. Shielded and unshielded piles are analysed. Three dimensional nonlinear analyses using ABAQUS 6.12 have been utilised. The research investigates the size of the surcharge loaded area, location of the pile tip and pile head load on the dragload and down drag imposed on the pile. Based on numerical results the study revealed that sacrificing piles, which are unloaded piles, ''hang up'' the soil between the piles in the group and, thus, the vertical effective stress around the shielded pile is reduced. Numerical results proved that an average value of the shear stress mobilisation factor b mobilised along unloaded shielded central pile varies between zero at neutral plane (NP) and 0.27. The long term dragload of the shielded floating pile is about 67% of the long term dragload of unshielded floating single pile. ª 2015 Production and hosting by Elsevier B.V. on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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Section: Effect Of Pile Tip Location On the Dragloadsupporting

confidence: 74%

“…Several centrifuge model tests have been carried out to investigate the response of endbearing and socketed piles subjected to NSF, Lee and Chen [32], Thomas et al. [51], Lee and Chen [33], Shen et al [47], Leung et al [38].…”

Section: Introductionmentioning

confidence: 99%

Behaviour of single pile in consolidating soil

Abdrabbo

Ali

2015

Alexandria Engineering Journal

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“…It has been found that the dragload induced by NSF opposes and is gradually eliminated by the applied axial load (Bozuzuk 1981). Once completely eliminated, the dragload need not be considered in pile design (Leung et al 2004). The axial load required to completely eliminate the induced dragload is approximately 1.25 to 3.25 times the maximum dragload (Jeong et al 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Although a number of studies have been carried out to investigate the behavior of piles subjected to NSF (Thomas et al 1998;Lee and Chen 2002;Leung et al 2004;Lam et al 2013), they examined the pile behavior under dragload only without considering axial loads.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of Y-shaped and circular floating piles in consolidating clay

Lam

et al. 2016

Can. Geotech. J.

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Although engineers often make use of pile geometry to improve the axial load capacity of piles, geometrical effects on floating piles in consolidating clay are still not fully understood. This paper reports two centrifuge model tests to investigate the responses of a Y-shaped pile and a circular pile subjected to an induced dragload and applied axial loads. Three-dimensional numerical back-analyses were performed considering the elasto-plastic slip. The Y-shaped and circular piles developed similar downdrag but the dragload induced on the Y-shaped pile was larger than that induced on the circular pile. As the axial load increased, the neutral plane shifted upward along a nonlinear path which gradient of the Y-shaped pile was gentler. The ultimate bearing capacity of the Y-shaped pile was 1.73 times that of the circular pile. The dragload on the Y-shaped and circular piles was eventually eliminated at approximately 0.56 and 0.83 times the corresponding ultimate pile capacities, respectively. Three flanges of the Y-shaped pile "hung-up" adjacent soil which settled together with the pile shaft. The lateral extent of vertically non-uniform trapped soil decreased with increasing axial load. Even though the Y-shaped and circular piles encountered a similar serviceability limit state, Y-shaped pile had advantages in bearing capacity.

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Negative Skin Friction on Piles: State of the Art

Rituraj

Rajesh

2021

Lecture Notes in Civil Engineering

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Behavior of Pile Subject to Negative Skin Friction and Axial Load

Cited by 59 publications

References 3 publications

Behaviour of single pile in consolidating soil

Behaviour of single pile in consolidating soil

Comparative study of Y-shaped and circular floating piles in consolidating clay

Negative Skin Friction on Piles: State of the Art

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