Theoretical
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            -
            <i>z</i>
            Curves

Kraft, Leland M.; Ray, Richard P.; Kagawa, Takaaki

doi:10.1061/ajgeb6.0001207

Cited by 191 publications

(10 citation statements)

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“…Hou et al researched the negative friction resistance of the side caused by water i mersion in expansive soil and considered that the pile-soil interface model proposed Kraft [40] (as demonstrated in Figure 2) can adequately reflect the negative frictional sistance characteristics [41]. Huang et al considered that the nonlinear behavior of a sin friction pile is described here by a nonlinear model which was proposed by Kraft [4 Although the pile side resistance to friction is negative in the self-balanced upper pile, pile-soil interaction is the same as in the positive friction resistance model.…”

Section: Analytical Conversion's Theoretical Basis Of Self-balanced T...mentioning

confidence: 99%

Research on the Analytical Conversion Method of Q-s Curves for Self-Balanced Test Piles in Layered Soils

Huang

Bai

et al. 2022

Applied Sciences

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An analytical conversion method was developed for the self-balanced test results of monopile bearing capacity in layered soils to realize the better applicability of the self-balanced test theory for the bearing capacity test of foundation piles. To the additional settlement of the lower pile bottom brought on by the negative friction of the upper pile soil during the loading process in layered soils, the interaction effect between the upper piles and lower piles is first taken into account. To accurately convert the results of the self-balanced test pile into the traditional static load test curve form and solve the ultimate bearing capacity, the displacements and internal forces at micro-segment piles in each layer of soil were obtained using the finite difference method. Then, for verification, conventional static test piles and indoor model tests were conducted in a multi-layered ground foundation. The outcome demonstrates that the simplified conversion method’s bearing capacity of the test pile is greater than that of the traditional static pressure test, the analytical conversion method’s Q-s curve is relatively similar to the results of the conventional static load test, and the accuracy of the analytical conversion results is increased by about 9.3 percent. At the same time, the analytical conversion method was applied to the self-balanced test project of bored cast-in-place piles in Wutong Garden, Laibin, Guangxi, China, and the accurate bearing capacity and internal force deformation characteristics were obtained. The accuracy of the calculation result is improved by 12% compared with that of the simple conversion calculation result. Therefore, it can be widely promoted and applied in self-balanced pile bearing capacity test projects.

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Section: Analytical Conversion's Theoretical Basis Of Self-balanced T...mentioning

confidence: 99%

Research on the Analytical Conversion Method of Q-s Curves for Self-Balanced Test Piles in Layered Soils

Huang

Bai

et al. 2022

Applied Sciences

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“…For the calculation and analysis of this bored pile using the load-transfer method, the load-transfer function Equations ( 2) and ( 8) should be determined first. Since Seed proposed the load-transfer method, many scholars have also proposed many transfer function models on this basis [9][10][11][12], and these models have laid the foundation for loadtransfer analysis of pile. The calculations in this paper use the Kezdi ideal elastic-plastic model with the load-transfer functions of the pile tip on the pile side as follows, respectively…”

Section: Pile Calculation Analysismentioning

confidence: 99%

Study on Vertical Load-Carrying Capacity of Post-Grouting Bored Piles

Kong

Gan

2022

Applied Sciences

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The relationship between pile side frictional resistance and pile tip resistance and settlement is assumed to be ideal elastic–plastic. The load-transfer method is used to analyze the load-bearing characteristics of bored pile in actual projects, and the results are compared with static load test results to prove the reliability of the analysis method and its parameters, on the basis of which the bored piles are reinforced with grouting, namely, pile tip grouting, pile side grouting, and pile tip pile–side composite grouting, are analyzed. The results show that the pile tip grouting mainly improves pile tip resistance and has almost no effect on pile side frictional resistance; the pile side grouting improves pile tip resistance and pile side frictional resistance more significantly; and pile tip–pile side composite grouting improves pile tip resistance and pile side frictional resistance more significantly than the first two. The ultimate load-carrying capacity of the pile is increased by 19%, 49%, and 53% after the use of pile tip grouting, pile side grouting, and composite grouting respectively.

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“…1,2 One of the simplest and arguably the most widely used one is the so-called Winkler method. [3][4][5][6][7][8][9][10] Models based on the Winkler method rely on a series of independent springs that are uniformly distributed along the pile shaft to quantify the reaction from soil to pile movements. Winkler-based models are not, strictly speaking, self-standing, as spring parameters must be independently estimated by approximate formulas, and less commonly, by fitting results of experimental measurements or numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

“…A wide range of analytical and numerical methods, of varying complexity, have been developed over the past decades to predict settlement of piles subjected to axial serviceability loads 1,2 . One of the simplest and arguably the most widely used one is the so‐called Winkler method 3–10 . Models based on the Winkler method rely on a series of independent springs that are uniformly distributed along the pile shaft to quantify the reaction from soil to pile movements.…”

Section: Introductionmentioning

confidence: 99%

Closed‐form solution for axially loaded end‐bearing piles in two‐layered soil

Zheng,

Chen,

Kouretzis

2023

Num Anal Meth Geomechanics

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This paper presents a mathematical model for the analysis of axially‐loaded end‐bearing piles embedded in a two‐layer elastic soil deposit. The governing equations of the soil layers surrounding the pile are cast by means of a Tajimi‐type continuum formulation, and this allows deriving a closed‐form expression that provides the frictional stresses that develop at the soil‐pile interface. The pile is treated as two virtual one‐dimensional elastic rods, and pile displacements are obtained by solving a system of linear equations that results from considering the boundary and continuity conditions. This results in improved efficiency compared to existing Tajimi‐based solutions for piles in layered soil, at no expense of accuracy. The model is used to study the effect of the relative stiffness of the soil layers on the serviceability behavior of axially‐loaded piles, and drawn conclusions of practical importance.

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Theoretical t - z Curves

Cited by 191 publications

References 0 publications

Research on the Analytical Conversion Method of Q-s Curves for Self-Balanced Test Piles in Layered Soils

Research on the Analytical Conversion Method of Q-s Curves for Self-Balanced Test Piles in Layered Soils

Study on Vertical Load-Carrying Capacity of Post-Grouting Bored Piles

Closed‐form solution for axially loaded end‐bearing piles in two‐layered soil

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