Study on Design Method of Pile Wall Combination Structure in a Deep Foundation Pit Considering Deformation Induced by Excavation

Wu, Changjiang; Yu, Jin; Cao, Xiaojian; Shen, W G

doi:10.3389/feart.2022.837950

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Various research methods are employed to analyze such deformations, including numerical simulation, theoretical analysis, and indoor testing. In their study, Wu et al [8] introduced a combined structural model that incorporates an elastic roadbed beam and a continuous beam. They incorporated elastic springs to simulate the interaction between the piles and the basement wall.…”

Section: Introductionmentioning

confidence: 99%

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Yin

2023

Applied Sciences

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Scholars often consider the deformation of a foundation pit retaining structure as a significant indicator of its stability. However, the current theoretical prediction formula for pit with pile–anchorretaining structure deformation is not yet perfect. This study utilizes a simplified spatial deformation model of a pile–anchorretaining structure and the principle of minimum potential energy to derive a prediction formula for the retaining structure’s spatial deformation. Afterwards, a numerical simulation model is developed based on actual engineering practices. On-site monitoring data is compared with the results of theoretical calculation formulas and numerical simulation models to validate their applicability. The research findings reveal minimal discrepancies between the theoretical calculation results, numerical simulation outcomes, and on-site monitoring data, indicating a high level of accuracy. Those three results follow consistent rules. The horizontal deformation curve of the crown beam exhibits a ‘V’-shaped distribution, and as the distance from the calculation point to the centerline of the foundation pit decreases, the horizontal deformation of the crown beam increases. The horizontal deformation curve of the pile displays a ‘V’-shaped distribution, and the pile’s horizontal deformation increases as the distance to the centerline of the foundation pit decreases. The research findings indicate that increasing the size and material strength of the crown beam and waist beam has only a limited effect on controlling the retaining structure’s deformation. However, by increasing the size and material strength of the pile, the deformation of the retaining structure can be significantly reduced.

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Section: Introductionmentioning

confidence: 99%

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Yin

2023

Applied Sciences

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Research on Load Bearing and Deformation Behavior of “Pile–Wall” Retaining Structure

Xu,

Zhang,

Shi

et al. 2024

Advances in Civil Engineering

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The “pile–wall” structure, which considers conventional temporary retaining piles as parts of the underground structure in the normal working stage, has been practiced, but there are insufficient studies on the optimization of the design of the “pile–wall” structure and the influence of various factors on the structural stresses and deformations. In order to analyze the factors affecting the stresses and deformations of the “pile–wall” structure, the numerical simulation of the “pile–wall” structure was carried out with the help of finite element simulation software Plaxis 3D through the excavation of Wuhan Optics Valley Center City Distributed Energy Project. The research of stresses and displacements on the “pile–wall” structural under the influence of different factors were carried out. The results show that the number of pile–wall connection nodes, the pile–wall thickness ratio, and the pile–wall stiffness ratio have influences on the stresses and deformations of the “pile–wall” structure. The number of connection nodes which is 4, the pile–wall thickness ratio which is 1 : 0.3, and the pile–wall stiffness ratio which is 1 : 1 are the most reasonable for the deformation and force of pile–wall structure in the project. The research results have good reference and guiding significance for the actual “pile–wall” excavation engineering structure, and the purpose of energy‐saving and consumption‐reducing construction can be achieved by seeking the reasonable values of the three and optimizing the construction program.

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Model Test and Numerical Simulation of Two Typical Close-Fitting Pile–Wall Integrated Structures in Deep Excavation

Wu,

Shen,

et al. 2024

Buildings

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Compared to conventional support methods, the close-fitting pile–wall integration technique features a minimized construction spacing between the retaining pile and the basement retaining wall. This approach leverages the pile stiffness to minimize the wall thickness and enhance underground space utilization. However, it currently lacks significant discussions and measured data about the interaction laws between the pile and the wall. The model test and finite element method (FEM) are employed to study the deformation and internal force interaction laws of two typical close-fitting pile–wall integrated structures, and a comparison with conventional design is conducted. Furthermore, this study separately investigates the impact of sensitivity factors, specifically the pile–wall stiffness ratio and floor plate stiffness, on both structures during the basement construction and serviceability stages. The test results can closely match the numerical simulation. The study results reveal that the wall impacts the bending moment of the pile to some extent. The internal force in the wall is significantly influenced by the lateral deformation of the pile and the floor plate. Compared to conventional designs, this structure significantly reduces the bending moment of the wall, particularly in the composite structure. Additionally, the analysis of sensitivity factors reveals their considerable influence on the pile–wall interaction.

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Study on Design Method of Pile Wall Combination Structure in a Deep Foundation Pit Considering Deformation Induced by Excavation

Cited by 3 publications

References 12 publications

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Spatial Deformation Calculation and Parameter Analysis of Pile–Anchor Retaining Structure

Research on Load Bearing and Deformation Behavior of “Pile–Wall” Retaining Structure

Model Test and Numerical Simulation of Two Typical Close-Fitting Pile–Wall Integrated Structures in Deep Excavation

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