Experimental Study on the Pile-Soil Synergistic Mechanism of Composite Foundation with Rigid Long and Short Piles

Guo, Yongxing; Lv, Chenyu; Hou, Siqiang; Liu, Yunlong

doi:10.1155/2021/6657116

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…e determination of foundation bearing capacity is crucial in the design of foundation. erefore, the determination of foundation bearing capacity of frozen soil under freezing conditions through tests is also critical for application in practical projects [25][26][27][28][29][30][31][32][33][34]. rough the test and analysis in this chapter, it is concluded that when the temperature gradually decreases, due to the cementation of ice in the soil, the bearing capacity of the foundation will significantly increase.…”

Section: Test Methodmentioning

confidence: 95%

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

2022

Computational Intelligence and Neuroscience

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In order to further improve the construction quality of water conservancy projects under different soil conditions and ensure the safety, stability, and durability of water conservancy project foundation construction under special circumstances, this study takes the bearing capacity of water conservancy land foundation as the research direction, takes frozen soil foundation and bag gravel pier composite foundation as examples, and further optimizes the parameters of foundation bearing capacity by using the theory of foundation ultimate bearing capacity and related algorithms. The P-S curve of bearing capacity shows that when the foundation is frozen to −15°C and the foundation sum is about 190 kN, the P-S curve trend at this time changes significantly, which is not different from the indoor simulation result of 170 kN. The final numerical analysis of foundation bearing capacity is relatively reliable, which can provide a powerful reference for the calculation of foundation bearing capacity of hydraulic engineering.

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Section: Test Methodmentioning

confidence: 95%

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

2022

Computational Intelligence and Neuroscience

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“…The model comprised structural (pile, raft and wall) and geotechnical (soil and cushion) parts that were modelled as elastic and elastic ideal plastic Mohr-Coulomb constitutive model, respectively. Even though Mohr-Coulomb model is not a state-of-the-art constitutive relation, it has widely been employed in FE analysis to describe the engineering characteristics of geotechnical materials while investigating the behaviour of composite piled raft foundations [6,10,[43][44][45] and performance of deep foundation pit excavations and/or their influence on the surrounding infrastructures. [26,46,47] Figure 1 depicts the typical meshed geometry employed in the model.…”

Section: Methodology Of Analysis 21 Finite Element Modellingmentioning

confidence: 99%

Numerical study on stress paths in grounds reinforced with long and short CFG piles during adjacent rigid retaining wall movement

Uge

Guo

Liu

2022

Studia Geotechnica Et Mechanica

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Ensuring the safety of existing structures is an important issue when planning and executing adjacent new foundation pit excavations. Hence, understanding the stress state conditions experienced by the soil element behind a retaining wall at a given location during different excavation stages has been a key observational modelling aspect of the performance of excavations. By establishing and carrying out sophisticated soil–structure interaction analyses, stress paths render clarity on soil deformation mechanism. On the other hand, column-type soft ground treatment has recently got exceeding attention and practical implementation. So, the soil stress–strain response to excavation-induced disturbances needs to be known as well. To this end, this paper discusses the stress change and redistribution phenomena in a treated ground based on 3D numerical analyses. The simulation was verified against results from a 1 g indoor experimental test conducted on composite foundation reinforced with long and short cement–fly ash–gravel (CFG) pile adjacent to a moving rigid retaining wall. It was observed that the stress path for each monitoring point in the shallow depth undergoes a process of stress unloading at various dropping amounts of principal stress components in a complex manner. The closer the soil element is to the wall, the more it experiences a change in principal stress components as the wall movement progresses; also, the induced stress disturbance weakens significantly as the observation point becomes farther away from the wall. Accordingly, the overall vertical load-sharing percentage of the upper soil reduces proportionally.

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“…Often, in order to control the main target parameters and facilitate comparative experiments, model tests on composite foundations are necessary. Through model tests, we can not only understand the working mechanism of different types of composite foundations, including the working mechanism of long-and short-pile composite foundations [11,12], but also analyze the load transfer mechanism, deformation, and settlement laws of different types of composite foundations [13][14][15][16]. In some cases, the combined use of numerical simulations and experiments can provide a more comprehensive study of composite foundations.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Combined Bearing Characteristics of Pile–Soil Interaction in Composite Foundation

Sui,

Zhang,

et al. 2024

Applied Sciences

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Composite foundations have been widely used and promoted in practical engineering applications. However, research on the joint-bearing mechanism of piles and soil within composite foundations is still not comprehensive enough. This paper proposes a method for calculating the additional internal forces of piles and soil within composite foundations. Based on a three-dimensional finite element analysis, this study investigates the variation patterns of the stress, displacement, and additional internal forces of piles and soil in the depth direction under the action of upper loads when using friction piles and end-bearing piles. This research aims to reveal the bearing performance of piles and soil. The results showed that, under the same conditions and due to the presence of end-bearing effects, the internal forces experienced by the entire pile body of the end-bearing piles were more uniform, exhibiting significant advantages in resisting deformation and being able to withstand larger loads. Additionally, the diffusion mechanism of the vertical forces, stresses, and displacements of piles and soil is discussed. Due to the negative frictional resistance of soil and the influence of pile end-bearing effects, the distribution of internal forces and the displacements of piles and soil exhibited different characteristics. This study provides a scientific reference for the theoretical analysis and design of composite foundations.

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Experimental Study on the Pile-Soil Synergistic Mechanism of Composite Foundation with Rigid Long and Short Piles

Cited by 11 publications

References 21 publications

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

Numerical study on stress paths in grounds reinforced with long and short CFG piles during adjacent rigid retaining wall movement

Finite Element Analysis of Combined Bearing Characteristics of Pile–Soil Interaction in Composite Foundation

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