Semi-analytical approach for time-dependent load–settlement response of a jacked pile in clay strata

Li, Lin; Li, Jingpei; Sun, Deqing; Gong, Weiming

doi:10.1139/cgj-2016-0561

Cited by 44 publications

(10 citation statements)

References 36 publications

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“…Xu et al [86] proposed a simplified solution to calculate time-dependent settlement for rigid composite foundations with multiple piles subjected to surface loads. Li et al [87] presented a semi-analytical approach to predict the time-dependent bearing performance of an axially loaded jacked pile in saturated clay strata.…”

Section: ) Rigid Composite Foundationmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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Construction issues of high-speed rail infrastructures have been increasingly concerned worldwide, of which the subgrade settlement in soft soil area becomes a particularly critical problem. Due to the high compressibility and low permeability of soft soil, the post-construction settlement of the subgrade is extremely difficult to control in these regions, which seriously threatens the operation safety of high-speed trains. In this work, the significant issues of high-speed railway subgrades in soft soil regions are discussed. The theoretical and experimental studies on foundation treatment methods for ballasted and ballastless tracks are reviewed. The settlement evolution and the settlement control effect of different treatment methods are highlighted. Control technologies of subgrade differential settlement are subsequently briefly presented. Settlement calculation algorithms of foundations reinforced by different treatment methods are discussed in detail. The defects of existing prediction methods and the challenges faced in their practical applications are analyzed. Furthermore, the guidance on future improvement in control theories and technologies of subgrade settlement for high-speed railway lines and the corresponding challenges are provided.

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Section: ) Rigid Composite Foundationmentioning

confidence: 99%

Review of research on high-speed railway subgrade settlement in soft soil area

2020

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“…Solutions for piles in a homogeneous soil 33 Taking into account perfect bonding at the soil-pile interface, ie, w(z) = u(d∕2, z), pile displacement can be determined from Equation 15:…”

Section: Pile Analysismentioning

confidence: 99%

“…The analysis of pile settlement is a classical problem in geotechnical and piling engineering, which has attracted research interest for a long time. Relevant numerical approaches include finite elements, [1][2][3][4][5] Green's functions and boundary element solutions, [6][7][8][9][10][11] simplified t-z models, [12][13][14][15] various hybrid formulations, [16][17][18][19][20][21] and various reviews. [22][23][24][25][26][27][28][29][30] Despite the research and the publications, important aspects of the problem such as the effect of soil inhomogeneity, pile slenderness, and pile-soil stiffness contrast on load transfer remain poorly understood, mainly because of the lack of pertinent analytical tools, which can provide insight into the physics of pile-soil interaction.…”

Section: Introductionmentioning

confidence: 99%

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An analytical continuum model for axially loaded end‐bearing piles in inhomogeneous soil

Anoyatis

Mylonakis

Tsikas³

2019

Num Anal Meth Geomechanics

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Summary An approximate static solution is derived for the elastic settlement and load‐transfer mechanism in axially loaded end‐bearing piles in inhomogeneous soil obeying a power law variation in shear modulus with depth. The proposed generalised formulation can handle different types of soil inhomogeneity by employing pertinent eigenexpansions of the dependent variables over the vertical coordinate, in the form of static soil “modes”, analogous to those used in structural dynamics. Contrary to available models for homogeneous soil, the associated Fourier coefficients are coupled, obtained as solutions to a set of simultaneous algebraic equations of equal rank to the number of modes considered. Closed‐form solutions are derived for the (1) pile head stiffness; (2) pile settlement, axial stress, and side friction profiles leading to actual, depth‐dependent Winkler moduli, (3) displacement and stress fields in the soil; and (4) average, depth‐independent Winkler moduli to match pile head settlement. The predictive power of the model is verified via comparisons against finite element analyses. The applicability to inhomogeneous soil of an existing regression formula for the average Winkler modulus is explored.

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“…Li and Gong [16] presented a method for predicting the load carrying behavior of pile groups consisting of new and existing displacement piles by combining the load-transfer method and shear displacement method and explored the stiffness efficiency and the loadsettlement behavior of pile groups with different layouts of new and existing piles. Li et al [17] presented a semianalytical approach to predict the time-dependent bearing performance of an axially loaded jacked pile in saturated clay strata and provided an incremental algorithm and a corresponding computational code to assess the time-dependent load-settlement response of a jacked pile.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Bearing Capacity and Deformation of Composite Pile Foundation with Long and Short Piles in Loess Areas

Yan-peng

Yang

2020

Advances in Civil Engineering

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In order to calculate the bearing capacity and settlement deformation of composite pile foundations with long and short piles in collapsible loess areas, the theoretical approximate solution was used to obtain the location of the neutral point of single piles. Additionally, based on the equation to calculate the bearing capacity of multielement composite foundations, a method considering the negative frictional resistance was proposed for calculating the bearing capacity of composite pile foundations with long and short piles. Based on the shear displacement method and the principle of deformation control, an equation to calculate the displacement and deformation of a composite pile foundation was presented. A model test with different operating conditions, i.e., a single pile, four piles, and eight piles, was designed to verify the proposed calculation methods. The results show that the location of the neutral point has a significant influence on the single-pile negative frictional resistance, and the neutral point ratio of the calculation meets the value range of the practical project. When the load at the top of the pile is relatively small, the experimental curve is consistent with the theoretical calculation curve, whereas when the load is comparatively large, the theoretically calculated displacement increase at the top of the pile is greater than the measured one. Under the premise that the theoretical calculation is in good agreement with the results, the theoretical value is larger than the actual value. And it contributes to strengthening engineering safety.

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Semi-analytical approach for time-dependent load–settlement response of a jacked pile in clay strata

Cited by 44 publications

References 36 publications

Review of research on high-speed railway subgrade settlement in soft soil area

Review of research on high-speed railway subgrade settlement in soft soil area

An analytical continuum model for axially loaded end‐bearing piles in inhomogeneous soil

Calculation of Bearing Capacity and Deformation of Composite Pile Foundation with Long and Short Piles in Loess Areas

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