Settlement analysis of pile groups in layered soils

Cairo, Roberto; Conte, Enrico

doi:10.1139/t06-038

Cited by 29 publications

(16 citation statements)

References 30 publications

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“…Settlement characteristic is a common parameter in group pile foundation design, which plays a crucial role in engineering applications [1]. Several analytical [2], numerical [3], and experimental studies [4] have been made on the group piles that can predict immediate settlements with good accuracy. Mishra and Patra [5] investigated the creep settlement of group piles for line group piles, square group piles, and rectangular group piles undergoing creep settlements over a period of time and the fuctuations of interaction factors on parameters such as pile length to diameter ratio, pile spacing, Poisson's ratio, and modulus ratio.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Settlement of Group Pile Foundation in Linear Viscoelastic Soil

You-sheng

2023

Advances in Civil Engineering

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The settlement of a group pile foundation is the result of elastic-plastic settlement of the pile and rheological settlement of the soil. Unfortunately, most research only considers elasto-plasticity settlement of piles or rheological settlement of soils. Classical theories like the Poynting-Thompson model only provide some prediction for the elasto-plasticity behavior of pile groups, which cannot satisfactorily reflect the total settlement characteristics of pile group foundation. In the current paper, we presented a method to study settlement behaviors of pile group foundation in linear viscoelastic soil based on the pile-pile interaction factors, the calculated equation of settlement of single piles and pile groups under vertical loads that are derived, the influence law of pile end resistance, pile spacing, slenderness ratio, elastic modulus ratio, and Poisson ratio on pile end load ratio, and the interaction factors that have been presented. Finally, some typical predictive examples have been presented for a 2 × 2, 3 × 3 group pile showing settlement from a field test. It is found that the pile-pile interaction factors increase with the increase of the pile-soil elastic modulus ratio and length-to-diameter ratio but decrease with the increase of the ratio of distance to diameter, and the ratio of distance to diameter has little effect on the interaction factor when pile spacing is more than 10 d (d is the diameter of the pile). The error between the field test results and computed data is 14.9%, the settlement calculated by the present method shows good agreement with the reported results, and the correlativity coefficients R2 are greater than 0.9223, which signifies that the present method is suitable for the theoretical calculation and prediction of the composite foundation settlement of linear viscoelastic soil when piles are used to strengthen the foundation. The method would provide a unique view to quantitative prediction of the settlement characteristic of group pile foundation.

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Section: Introductionmentioning

confidence: 99%

Analysis of Settlement of Group Pile Foundation in Linear Viscoelastic Soil

You-sheng

2023

Advances in Civil Engineering

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“…Konagai et al [12] described the interaction characteristics of pile groups and soil in the form of a single pile analogy, which produced the nonlinear characteristics of the settlement of the pile groups under loading. Combined with the stiffness matrix theory and the integral interaction factors of pile groups, Roberto and Enrico [13] proposed a nonlinear analysis method of the soil settlement of the vertical load under the pile groups. Based on the sedimentation characteristics of the single pile and the pile groups under loading in layered soil, a simple method of analysis of the soil-settlement characteristics of the pile groups was proposed by Zhang et al [14].…”

Section: Introductionmentioning

confidence: 99%

Load-Settlement Behaviour Analysis Based on the Characteristics of the Vertical Loads under a Pile Group

2022

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The nonlinear load-settlement behaviours of vertically loaded pile groups containing various numbers of piles (up to a few hundred piles in a group) are analysed using the method proposed by Lee and Xiao. This back-analysis method assumes the “local shear displacement” of a thin layer of disturbed soil along the pile–soil interface and the soil outside the interface is assumed to be linear elastic. Parametric studies are conducted to examine the load-displacement behaviours of the rigidly capped pile groups. Factors such as the number of piles in a group, pile slenderness (L/D), and pile spacing (S/D) are examined to study the effects on the performance of pile groups up to the failure state. Some phenomenological features of large pile groups under nonlinear conditions, which are difficult to obtain through an elastic analysis, are revealed in the present analysis.

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“…Several analytical, numerical, and experimental studies have been made on the immediate settlement of single piles and pile groups that are capable of predicting immediate settlements with good accuracy. However, studies on time‐dependent settlements have been limited owing to its complexity and the assumption that it accounts for only an insignificant proportion of the total settlement.…”

Section: Introductionmentioning

confidence: 99%

Analysis of creep settlement of pile groups in linear viscoelastic soil

Mishra

Patra

2019

Num Anal Meth Geomechanics

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Summary This paper presents the analysis of creep settlement of pile groups for line pile groups, square pile groups, and rectangular pile groups undergoing creep settlements over a period of time. The soil is treated as a viscoelastic material and is modeled using a three‐parameter viscoelastic model. The damping component (dashpot) takes care of the permanent time‐dependent deformations in three‐parameter viscoelastic model. An approach suggested by Mindlin has been employed to calculate the stress distribution along the pile length in a group. The viscoelastic problem is converted into an elastic problem by the application of Laplace transform. Results in the form of variation of interaction factors for parameters such as pile length to diameter ratio, pile spacing, Poisson's ratio, and modulus ratio have been presented. Comparison has been made between interaction factors for piles groups undergoing immediate settlements and creep settlements. Finally, a typical predictive example has been presented for a 3 × 3 pile group showing creep settlement. The load rearrangement due to creep settlements causes about 5% to 35% increase in base resistance over time. Interaction factors for pile groups (2 × 1, 3 × 1, 2 × 2, and 3 × 2) undergoing creep settlement is about 15% to 55% higher than the interaction factors considering only the immediate settlements for pile group spacing less than or equal to 5d.

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Settlement analysis of pile groups in layered soils

Cited by 29 publications

References 30 publications

Analysis of Settlement of Group Pile Foundation in Linear Viscoelastic Soil

Analysis of Settlement of Group Pile Foundation in Linear Viscoelastic Soil

Load-Settlement Behaviour Analysis Based on the Characteristics of the Vertical Loads under a Pile Group

Analysis of creep settlement of pile groups in linear viscoelastic soil

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