Ultimate lateral resistance of tripod pile foundation in clay

Zhao, Zihao; Kouretzis, George; Sloan, Scott W.; Gao, Yufeng

doi:10.1016/j.compgeo.2017.08.012

Cited by 19 publications

(4 citation statements)

References 21 publications

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“…Using three-dimensional finite element (FE) modelling, Georgiadis (2014) reported that group effects on the ultimate soil pressure acting on a pile row were depthdependent: pile interaction was negligible close to the soil surface and tended to a higher limiting value at greater depths. Georgiadis et al (2013aGeorgiadis et al ( ,2013b, Zhao et al (2017a) and Zhao et al (2017b) used two-dimensional FE modelling to derive expressions for the ultimate bearing capacity for a group of two, three and four piles respectively, considering pile spacing, pile-soil adhesion and load direction. More recently, Sheil (2020) used two-dimensional FE to develop closed-form equations for the determination of the limiting pressure acting on square groups of 4 to 25 piles.…”

Section: Introductionmentioning

confidence: 99%

Group shape effects on the lateral capacity of pile groups in undrained soil

Swallow

Sheil

2023

Géotechnique

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In this paper, the lateral limiting pressure on rectangular pile groups in undrained soil is explored using two-dimensional finite-element (FE) modelling. The primary aim of the study is to assess the influence of pile group shape effects on the soil limiting pressure offered by the deep ‘flow-around’ failure mechanism, and associated soil failure mechanisms, considering both a small (four piles) and large (36 piles) group. Additional parameters considered in the modelling include pile spacing and pile–soil interface roughness. The FE results show that group shape has a significant influence on the behaviour of closely spaced pile groups. In particular, the number of piles parallel to the direction of loading is shown to dominate the lateral bearing capacity factor such that significant increases in capacity efficiency can be achieved by slight modifications to the group shape for a given number of piles. The load-sharing across the group, traditionally defined using p-multipliers, was also shown to be highly non-uniform and dependent on group size, pile–soil roughness and group geometry in addition to the pile spacing. The FE output is presented in the form of design charts for the determination of group p-multipliers, whereas a library of existing design solutions is presented for the calculation of the overall group response.

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Section: Introductionmentioning

confidence: 99%

Group shape effects on the lateral capacity of pile groups in undrained soil

Swallow

Sheil

2023

Géotechnique

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“…Martin & Randolph (2006). Using 3D finite element (FE) analysis Georgiadis (2014) showed that the deep failure mechanism for an infinitely long pile row also corresponds to a 2-D 'flow-around' mechanism; this prompted more recent extensions to two side-by-side piles (Georgiadis et al 2013a(Georgiadis et al , 2013b, tripod groups (Zhao et al 2017a), tetrapod groups (Zhao et al 2017b), square groups (Sheil 2021) and rectangular groups (Swallow & Sheil 2021). Application in engineering practice involves incorporating these limiting pressures within existing design methods capable of describing the overall loaddisplacement of the group, such as those proposed by Comodromos and Pitilakis (2005) and Papadopoulou (2012, 2013).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the deep soil failure mechanism for perimeter pile groups

Watford¹,

Templeman²,

Orazalin³

et al. 2022

Géotechnique Letters

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In this paper, the lateral limiting pressure offered by the deep ‘flow-around’ soil failure mechanism for perimeter (ring) pile groups in undrained soil is explored using two−dimensional finite element modelling. A parametric study investigates the role of group configuration, pile−soil adhesion, group size, pile spacing and load direction on group capacity and corresponding soil failure mechanisms. The finite element output show that the plan group configuration (square or circular) has a negligible influence on lateral capacity for closely spaced perimeter pile groups. When compared to ‘full’ square pile groups with the same number of piles, the present results suggest that for practical pile spacing (≳ two pile diameters), perimeter groups do not necessarily increase capacity efficiency, particularly if the piles are smooth. Nevertheless, perimeter groups are shown to be characterized by both the invariance of their capacity to the direction of loading and their highly uniform load-sharing between piles, which are beneficial features to optimize design.

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“…For a triangular composite foundation [22], a wide pile spacing can realize the best combination of pile groups, thus improving ULC. Modifying the single-pile p-y curve was also used in the analysis of the lateral loading behavior of pile groups [23,24].…”

Section: Introductionmentioning

confidence: 99%

Bearing Characteristics of Multi-Wing Pile Foundations under Lateral Loads in Dapeng Bay Silty Clay

Wang

Tang

et al. 2022

JMSE

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This study provides a theoretical basis for reinforcement of the soil around multi-wing piles. Limit analysis was used to determine the ultimate lateral capacity (ULC) of three- and four-wing piles in Dapeng Bay silty clay. The effects of the pile–soil interaction coefficient α, wing width Bw, and lateral-load direction β on the ULC of the pile and the shear plastic zone range of the surrounding soil were analyzed. The normalized ULC of the three-wing pile decreased when the wing–diameter ratio increased. When Bw was 0.15 m and α was 0.4, the ULC of the four-wing pile was 19% higher than that of the three-wing pile. As β increased, the normalized ULC of the four-wing pile decreased, whereas that of the three-wing pile went through a minimum at 30°. The size of the soil shear plastic ring did not depend on α for either pile type; it increased around the three-wing (but not the four-wing) pile with changes in β. However, there was also a double plastic ring of broken soil around the four-wing pile. The four-wing pile had a more symmetrical influence on the soil around the pile than the three-wing pile.

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Ultimate lateral resistance of tripod pile foundation in clay

Cited by 19 publications

References 21 publications

Group shape effects on the lateral capacity of pile groups in undrained soil

Group shape effects on the lateral capacity of pile groups in undrained soil

Numerical analysis of the deep soil failure mechanism for perimeter pile groups

Bearing Characteristics of Multi-Wing Pile Foundations under Lateral Loads in Dapeng Bay Silty Clay

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