Study of Strain Wedge Parameters for Laterally Loaded Piles

Hajialilue-Bonab, Masoud; Sojoudi, Yones; Puppala, Anand J.

doi:10.1061/(asce)gm.1943-5622.0000186

Cited by 51 publications

(9 citation statements)

References 16 publications

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“…20 presents a three-dimensional illustration of the stiffness degradation predicted by the HSsmall model. Interestingly, the HSsmall-predicted stiffness degradation contours are conical in shape; this is consistent with the 'cone-shaped' shear strain contours for a model pile (in loose sand) based on PIV measurements documented by Hajialilue-Bonab et al (2013). Moreover, it can be seen from Fig.…”

Section: Soil Densificationsupporting

confidence: 87%

Biaxial Loading of Offshore Monopiles: Numerical Modeling

Sheil

McCabe

2017

Int. J. Geomech.

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In this paper, the FE software package PLAXIS 3D (2013) is used to examine the influence of biaxial lateral loading of a monopile foundation. Two different soil models are adopted to investigate the influence of state-dependent and anisotropic behaviour of soil on monopile response. A series of analyses were carried out where both cyclic and static lateral loads were applied to the pile. Results show that the consideration of biaxial loading significantly influences the pile head load-displacement response in addition to the development of significant accumulated displacements and co-existent soil loosening and densification. Moreover, predictions determined using a state-independent soil model are shown to be significantly non-conservative; these findings have important implications for environmental loading of offshore monopiles.

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Section: Soil Densificationsupporting

confidence: 87%

Biaxial Loading of Offshore Monopiles: Numerical Modeling

Sheil

McCabe

2017

Int. J. Geomech.

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“…The results indicated that the displacement field of the soil above the mud surface, in the direction of loading, approximates a circular shape. Furthermore, Hajialilue-Bonab et al [13] and Zhang et al [14] respectively utilized PIV technology and three-dimensional FEM to study the failure modes of shallow soil. The results showed that, unlike the tetrahedral wedge failure mode proposed by Reese et al [11], the failure mode of shallow soil manifests as a conical, which may introduce errors in the results.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that, unlike the tetrahedral wedge failure mode proposed by Reese et al [11], the failure mode of shallow soil manifests as a conical, which may introduce errors in the results. Numerous scholars [13,14,15,16] have developed calculation methods for horizontally loaded piles based on this observed failure mode. However, these methods involve complex calculation processes, which hinder their widespread application Based on the above reasons, this paper assumes that the failure mode of the soil in front of the pile is conical, establishes a modified strain wedge model of the shallow soil, and obtains the ultimate soil resistance expression through the limit equilibrium theory.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Lateral Resistance of Single Piles in Sand

Mu,

Wang,

Huang

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The p-y curve method is currently the most widely utilized analytical approach for horizontally loaded piles. Precisely determining the ultimate soil resistance is essential to enhance the accuracy of the p-y curve. Despite various scholars proposing methods to establish the law governing ultimate soil resistance with soil depth in the sand, significant discrepancies exist among these approaches. This paper posits that the three-dimensional failure mode of the shallow soil in front of the pile manifests as a cone when it reaches the limit state. The expression for the ultimate soil resistance of a single pile in shallow soil is derived through limit equilibrium theory, and subsequently, the modified p-y curve is obtained. The accuracy was validated through a comparison between the corrected p-y curve and results obtained from centrifugation experiments and field studies. In contrast to the API specification method, the refined hyperbolic function p-y curve demonstrates enhanced precision, facilitating precise predictions of pile head displacement and pile bending moments under horizontal loads.

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“…The results are mainly presented as the p-multipliers for various pile groups. Recently, improvement of CT (computer tomography) and PIV (particle image velocimetry) technologies led to the experimental studies [41][42][43][44][45] of soil deformation patterns under lateral loading, with the main conclusions regarding the three-dimensional (almost conical) shape of the soil deformation zone, as well as the progressive soil failure. The magnitude of the pile group interaction can be described by comparing the pile group response with the response of equivalent single pile for the same mean loading.…”

Section: Introductionmentioning

confidence: 99%

Flexible Pile Group Interaction Factors under Arbitrary Lateral Loading in Sand

Marjanović

Vukićević

König

2020

JMSE

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Marine and harbor structures, wind turbines, bridges, offshore platforms, industrial chimneys, retaining structures etc. can be subjected to significant lateral loads from various sources. Appropriate assessment of the foundations capacity of these structures is thus necessary, especially when these structures are supported by pile groups. The pile group interaction effects under lateral loading have been investigated intensively in past decades, and the most of the conducted studies have considered lateral loading that acts along one of the two orthogonal directions, parallel to the edge of pile group. However, because of the stochastic nature of its source, the horizontal loading on the pile group may have arbitrary direction. The number of studies dealing with the pile groups under arbitrary loading is very limited. The aim of this paper is to investigate the influence of the arbitrary lateral loading on the pile group response, in order to improve (extend) the current design approach for laterally loaded pile groups. Free head, flexible bored piles in sand were analyzed through the extensive numerical study. The main hypothesis of the research is that some critical pile group configurations, loading directions, and soil conditions exist, which can lead to the unsafe structural design. Critical pile positions inside the commonly used pile group configurations are identified with respect to loading directions. The influence of different soil conditions was discussed.

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Study of Strain Wedge Parameters for Laterally Loaded Piles

Cited by 51 publications

References 16 publications

Biaxial Loading of Offshore Monopiles: Numerical Modeling

Biaxial Loading of Offshore Monopiles: Numerical Modeling

Ultimate Lateral Resistance of Single Piles in Sand

Flexible Pile Group Interaction Factors under Arbitrary Lateral Loading in Sand

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