Bearing capacity and simplified calculation approach for large-diameter plain-concrete piles

Lijuan, Wang; Zhao, Qihua; Mao, Jianqiang; Wu, Jiujiang; Guo, Fengshuang

doi:10.1007/s12517-021-07845-2

Cited by 4 publications

(5 citation statements)

References 26 publications

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“…As a result, these piles h lost their initial bearing capacity, highlighting significant environmental disturbance the insufficient strength of the pile. The characteristics of the pile-soil system in the composite foundation are closely related to the external loads applied during the foundation treatment [29]. Concrete piles are prone to brittle fracture.…”

Section: Project Overviewmentioning

confidence: 99%

See 1 more Smart Citation

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Li,

Yi,

et al. 2024

Buildings

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The intricacies of foundation pit engineering often result in alterations to the surrounding environment, posing potential threats to the safe operation of nearby buildings and pile foundations. This study employs finite element numerical simulation to scrutinize the influence of vacuum preloading pressure, preloading duration, excavation slope ratio, excavation duration, and retaining pile wall depth on the stress and deformation of existing plain concrete pile foundations. The findings reveal that the impacts of excavation are primarily absorbed by both proximal and distal piles in relation to the pit. Moreover, elevating vacuum preloading pressure and extending the preloading duration during dewatering can lead to increased internal forces and displacement of the piles. Changes in excavation slope ratio exhibit minimal effects, while prolonged excavation duration can shift internal forces from predominantly positive to negative, with negligible impact on horizontal displacement. Importantly, augmenting the depth of the retaining pile wall embedding effectively mitigates the effects of pit excavation.

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Section: Project Overviewmentioning

confidence: 99%

“…The characteristics of the pile-soil system in the composite foundation are closely related to the external loads applied during the foundation treatment [29]. Concrete piles are prone to brittle fracture.…”

Section: Basic Information Of Numerical Modelmentioning

confidence: 99%

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Li,

Yi,

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

“…Then, according to the principle of the self-balance accurate conversion method and the relationship between the side friction resistance and the variable displacement, the self-balanced test results are converted into an equivalent pile top load-displacement (Q-s) curve. Using the equivalent load method to convert the load loading value of the upper and lower piles into the Q-s curve of the traditional static pressure pile, the ultimate bearing capacity of the single pile can be calculated, which can be expressed as Equation ( 34) (34) where Q u t up is the upper pile's maximum bearing capacity; where Q u l down is the lower pile's maximum bearing capacity.…”

Section: Conversion To Traditional Static Pressure Test Pilementioning

confidence: 99%

“…Currently, in engineering, the test results of self-balanced test piles are converted to conventional static load test Q-s curves by the exact conversion method and the simplified conversion method. With the simple conversion method, it is difficult to determine the exact value of the conversion coefficient in different soil layers [23,24,32], and it lacks of some theoretical support [33][34][35]. The precise conversion method also increases the burden on the test pile, since each micro-segment's displacement and internal force need to be measured with many specific displacement transducers [36].…”

Section: Introductionmentioning

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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“…Wang [3], etc. conducted static load and axial force tests of super-long bored piles in loess foundations in Xi'an City.…”

Section: Introductionmentioning

confidence: 99%

Calculation and Application of Ultimate Lateral Friction Resistance of Concrete Piles under Different Soil Layer Materials

Chen,

Jun,

et al. 2023

KEM

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In practical engineering applications, it usually gets the expected value of the ultimate side friction of concrete piles by the empirical parameter method. The expected value of the ultimate side friction of concrete piles cannot achieve maximum optimization due to the complexity of formation conditions and the lack of experience of technicians. To accurately obtain the ultimate lateral friction resistance of piles in homogeneous soil layers, optimize the standard value of pile ultimate lateral resistance, ensure construction safety, and save construction costs, the research method combining theoretical derivation and on-site measurement data validation was done in the manuscript. Based on the shear strength of the pile-soil interface of different materials and the shear performance of the soil around the pile, a calculation equation for the standard value of the ultimate lateral friction resistance of concrete piles in different homogeneous soil materials was derived and applied to the equation for calculating the ultimate bearing capacity of foundation pile and the axial force of pile. Finally, based on an engineering example, the calculated results were compared with the measured resultsThe research results show that in thick coarse-grained soil, as the foundation pile is short, the ultimate bearing capacity of a single pile obtained using the calculation equation deduced in this paper is less than that obtained using the empirical equation provided by the national code. In a deep cohesionless homogeneous soil material, the concrete pile shaft axial force calculation using the pile shaft axial force calculation equation deduced in this paper is close to the measured value when the foundation pile bears the ultimate load; the proposed new method has good application value.

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Bearing capacity and simplified calculation approach for large-diameter plain-concrete piles

Cited by 4 publications

References 26 publications

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

Excavation Effects on Reinforced Concrete Pile Foundations: A Numerical Analysis

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

Calculation and Application of Ultimate Lateral Friction Resistance of Concrete Piles under Different Soil Layer Materials

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