Hybrid Method for Predicting the Response of a Pile-Raft Foundation to Adjacent Braced Excavation

Mu, Linlong; Chen, Wei; Huang, Maosong; Lu, Qi

doi:10.1061/(asce)gm.1943-5622.0001627

Cited by 18 publications

(4 citation statements)

References 54 publications

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“…Movement of soil around a loaded pile resulting from the excavation was studied by [23] using PLAXIS 3D finite element software. A two-step method was proposed to determine the response of pile-raft foundations to excavations in layered soil [24]. Although pile foundations affected by excavations and the effect of the end-bearing pile's embedment length into a stiffer deep layer were analyzed by [25], the changes in effective stress and its effect on the shaft and base resistances were not taken into account.…”

Section: Introductionmentioning

confidence: 99%

Performance of Pile Group Affected by Adjacent Excavations in Sand below the Water Table

Shaaban,

Abd El-Naiem,

Senoon

et al. 2024

Sohag Engineering Journal

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Numerical analysis is conducted to investigate the settlement and tilting behavior of a group of piles adjacent to an excavation in saturated sand by using PLAXIS 3D finite element software. Moreover, the analysis aims to gain a better understanding of the load transfer mechanisms of the piled foundations due to an adjacent excavation. The influences of excavation depth, pile group location from excavation, initial working load, supporting system stiffness, and stiffness of piles and cap are investigated. As excavation proceeds, settlement and tilting of the adjacent buildings can be observed at different stages of excavation. The pile group settles to its maximum amount when the rear piles are in the position of maximum greenfield ground surface settlement. The settlement of the pile group can be significantly reduced by increasing the supporting system stiffness and decreasing the pile cap's applied load. The pile group settlement due to the excavation increases from 2.99 to 3.80% of the pile diameter when the ratio of applied load to ultimate load-carrying capacity of the pile group increases from 0.25 to 0.5. A clearly noticeable tilting can be observed when the pile group is located near the excavation. By increasing the pile cap's applied load and supporting system stiffness, the pile group tilting decreases. The settlement and tilting of the pile group are almost insensitive to the modulus of elasticity of the concrete piles and the cap. Loads are transferred between the toe and the shaft of the piles at different excavation stages.

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Section: Introductionmentioning

confidence: 99%

Performance of Pile Group Affected by Adjacent Excavations in Sand below the Water Table

Shaaban,

Abd El-Naiem,

Senoon

et al. 2024

Sohag Engineering Journal

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“…On the other hand, the safety of conventional piles subjected to ground movements arising from nearby excavations and other sources has globally received particular interest. [22][23][24][25][26][27][28] Researchers such as Shi et al [29] and Shakeel and Ng [30] have discussed the load transfer mechanism and the response of single and group pile, respectively, using stress path followed during excavation stages. The soil elements for observation were taken around the pile, and the load-sharing phenomena were captured by comparing the level of stress the soil element encounters.…”

Section: Introductionmentioning

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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“…In recent years, the safety of conventional pile foundation subjected to ground movements arising from nearby excavations and/or other sources has particularly garnered the attention of scholars globally [21][22][23][24]. is is because the risk associated with foundation pit excavation-induced phenomenon could bring about causalities and huge economic losses as a result of catastrophic collapse of infrastructures [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Load Sharing Performance of Long‐Short CFG Pile Composite Foundation Subjected to Rotation of Adjacent Retaining Wall

Uge

Guo

Liu

2021

Advances in Civil Engineering

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The stress and displacement boundary conditions of excavation retaining structures affect the deformation mechanism and movement of the retained soil mass. The soil movement disturbs the load sharing performance and structural integrity of cement-fly ash-gravel (CFG) pile composite foundations existing in the vicinity, which merits considerable research work. This article presents results from 3D finite element analyses performed to study the influence of retaining wall rotation on the load sharing characteristics of adjacent CFG pile composite foundation comprising long and short piles. To verify the numerical model, a relatively large-scale 1 g physical model test was conducted. It is revealed that to arrive at a new static equilibrium during progression of wall rotation, the percentage load sharing ratios of the long and short piles change increasingly while the load proportion carried by the upper soil reduces remarkably. The percentage load sharing characteristics of CFG pile composite foundation are more affected in immediate proximity to the wall than those located at far distance. For the foundation having 3 × 3 long and short piles placed at 3.0–15.0 m away from the wall, the location resulted in a reduction of soil bearing capacity ranging between 1.4 and 7.5% of the total imposed load while the corresponding increase in the % load borne by the long and short pile range was 0.83–4.15 and 0.59–3.36%, respectively. For the other parameters considered in this article viz. pile spacing, subsoil stiffness, cushion stiffness and thickness, and applied working load, the increment in % load sharing of the long and short pile range was 3.45–4.15, 1.3–5.79, 1.48–3.36, 4.15–4.79, and 3.67–4.15% and 3.36–4.67, 1.43–4.99, 1.48–3.36, 3.36–3.64, and 1.38–3.36% of the imposed load, respectively. Moreover, the long piles’ load sharing proportion was higher than that of short piles, and peripheral piles received larger load proportion.

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Hybrid Method for Predicting the Response of a Pile-Raft Foundation to Adjacent Braced Excavation

Cited by 18 publications

References 54 publications

Performance of Pile Group Affected by Adjacent Excavations in Sand below the Water Table

Performance of Pile Group Affected by Adjacent Excavations in Sand below the Water Table

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

Numerical Analysis on the Load Sharing Performance of Long‐Short CFG Pile Composite Foundation Subjected to Rotation of Adjacent Retaining Wall

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