Behaviour of Load-Bearing Components of a Cushioned Composite Piled Raft Foundation Under Axial Loading

Sharma, Vaibhav; Vasanvala, S. A.; Solanki, C. H.

doi:10.2478/sjce-2014-0020

Cited by 7 publications

(7 citation statements)

References 8 publications

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“…Scholars have studied the effects of the elastic modulus and length of piles on the properties of composite foundations [ 1 , 9 , 10 ], while no studies have focused on the lateral earth pressure acting on the retaining structure adjacent to CFRLPs. To study the effect of the elastic modulus and length of flexible piles on the lateral earth pressure acting on the retaining structure, the elastic modulus of the flexible pile varies from 400–1200 MPa, the length of the flexible pile varies from 1–1.4 m, and the other parameters are the same as those above.…”

Section: Fem Analysismentioning

confidence: 99%

“…The authors claimed that the length of the pile in the composite foundation has significant effects on the settlement of the foundation and that the greater the length of the pile, the less the settlement is. Sharma et al [ 10 ] numerically investigated the main factors influencing the settlement of composite foundations. The authors found that the settlement of the raft decreases with an increase in the cushion thickness.…”

Section: Introductionmentioning

confidence: 99%

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Study on the earth pressure of a foundation pit adjacent to a composite foundation with rigid-flexible and long-short piles

Guo

Jin

et al. 2021

PLoS ONE

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Model tests were performed to investigate the lateral earth pressure acting on the retaining structure adjacent to both natural ground (NG) and composite foundation (CFRLP), which were supported with rigid-flexible and long-short piles. Two testing procedures, namely, applying a load to the foundation and rotating the retaining structure along its toe, were considered. The results indicate that the additional lateral earth pressure acting on the retaining structure adjacent to the CFRLP is less than that of the NG in the depth of the reinforcement area strengthened by flexible piles. Compared with NG, the CFRLP yielded a smaller normalized height of application of the lateral earth pressure, suggesting that the CFRLP blocked the horizontal diffusion of the load and had a strong ability to transfer the surcharge load to the deep soil. When rotating the retaining structure, the lateral earth pressure acting on the upper part of the retaining structure experienced limited reduction once the displacement at the top of the retaining structure was greater than 8 mm, whereas the pressure acting on the lower part of the retaining structure continued to decrease with increasing displacement. In addition, a three-dimensional finite element model (FEM) was used to investigate the influence of the pile parameter and the wall-soil friction angle on the additional lateral earth pressure.

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Section: Fem Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the earth pressure of a foundation pit adjacent to a composite foundation with rigid-flexible and long-short piles

Guo

Jin

et al. 2021

PLoS ONE

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“…In the finite element analysis of the pile-raft foundation, a solid element is used to simulate the pile, and the pile-soil interaction is, thus, considered by setting the interface elements [16][17][18]22]. The common interface model is the zero-thickness interface model proposed by Goodman et al [29].…”

Section: Solid Element and Interfacementioning

confidence: 99%

“…Schweiger et al [24], Tradigo et al [25], and Engin et al [30] verified the performance of single-pile foundations, pile group foundations, and pile-raft foundations simulated using the embedded pile element instead of the solid pile element. In the finite element analysis of the pile-raft foundation, a solid element is used to simulate the pile, and the pile-soil interaction is, thus, considered by setting the interface elements [16][17][18]22]. The common interface model is the zero-thickness interface model proposed by Goodman et al [29].…”

Section: Embedded Pile Elementmentioning

confidence: 99%

“…For this complex structural system, the finite element method (FEM) is an effective analytical tool. Liang et al [16], Zheng et al [17], Sharma et al [18], Tradigo et al [19], Rasouli et al [20], Ata et al [21], and Ata et al [22] studied the load-transfer mechanism and settlement characteristics of piled rafts with cushions using three-dimensional (3D) finite element analysis. It was assumed in these studies that the pile was in homogeneous soil, and a solid element was used to simulate the pile.…”

Section: Introductionmentioning

confidence: 99%

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3D Numerical Analysis of Synergetic Interaction between High-Rise Building Basement and CFG Piles Foundation

et al. 2018

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A strong bearing capacity and the satisfaction of strict settlement requirements are necessary for high-rise buildings. A single-raft foundation cannot meet certain settlement requirements, in which case CFG (cement/fly ash/gravel, an emerging and sustainable construction material) piles can be used in the foundation to set up a cushion between the top of the pile and the raft slab, where the piles act as settlement reducers. The rafts of disconnected piles (DPs) exhibit complex synergetic interactions involving the raft, cushion, pile, and soil under the load of the superstructure. Multiple piles in particular lead to an increase in the number of degrees of freedom of the problem, resulting in difficulty in solving it. However, when the number of piles is very large and the structure is complex-for example, many buildings are placed on the same raft with basement structures-even if the embedded pile element is used during numerical calculations, either the method remains prone to non-convergence or the time needed for numerical calculations is too long. It is, thus, difficult to satisfy the requirement of an efficient scheme of evaluation in practice. To solve this problem, a method that uses a simulation of the integral equivalent of the CFG pile reinforcement zone is proposed in this paper. In the CFG pile reinforcement zone, the effect of the pile is reflected in the enhancement of parameters of the soil in the strengthened zone, and the reinforcement zone (including the soil and the pile) is regarded as an anisotropic elastoplastic material. As the structure of the pile is no longer needed in the model, its elimination significantly reduces the complexity of the model and improves its calculation efficiency. An example of a numerical calculation is provided to verify the viability and accuracy of the integral equivalent simulation method in comparison with the embedded pile element simulation method. Finally, the proposed method is applied to the three-dimensional numerical analysis of a scheme for the treatment of foundations of high-and low-rise buildings with basements, and its effectiveness is further verified through comparison with theoretical results.

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A Simplified Method for the Nonlinear Analysis of Composite Piled Raft Foundation

El-Garhy

2022

Geotech Geol Eng

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Behaviour of Load-Bearing Components of a Cushioned Composite Piled Raft Foundation Under Axial Loading

Abstract: In the last decade piled raft foundations have been widely used

Cited by 7 publications

References 8 publications

Study on the earth pressure of a foundation pit adjacent to a composite foundation with rigid-flexible and long-short piles

Study on the earth pressure of a foundation pit adjacent to a composite foundation with rigid-flexible and long-short piles

3D Numerical Analysis of Synergetic Interaction between High-Rise Building Basement and CFG Piles Foundation

A Simplified Method for the Nonlinear Analysis of Composite Piled Raft Foundation

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