Contact versus noncontact piled raft foundations

Fioravante, Vincenzo; Giretti, Daniela

doi:10.1139/t10-021

Cited by 80 publications

(24 citation statements)

References 8 publications

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“…Compared to the graded gravel cushion, the settlements increased with fine gravel and decreased with coarse gravel. The settlement performance of a DPR can be quantified by means of the definition of the following settlement efficiency ratio [17]:…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…Cao et al [15] and Wong et al [16] suggested that piles can be disconnected from a raft to overcome the problem of high stress in the piles and raft and that the gap between the raft and unconnected piles can be filled with a cushion of structural fill material. Fioravante and Giretti [17] and Fioravante [18] performed centrifuge tests on a piled raft model to investigate the load transfer mechanisms between a raft and piles in dry dense sand in cases where the piles are either in direct contact with the raft or separated from the raft by a granular cushion.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Load Sharing Behaviour and Cushion Failure Mode for a Disconnected Piled Raft

Zhu

2017

Advances in Materials Science and Engineering

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Disconnected piled raft (DPR) foundations are characterized by having no structural connection to a raft. The raft-pile gap is filled with a granular cushion, which creates a more uniform pressure distribution on the raft and reduces the differential settlement. A series of tests has been performed to investigate the load transfer mechanisms of a DPR. The effects of the thickness and stiffness of the cushion and the pile diameter are presented and discussed. A simple failure mode of the cushion is also put forward according to the cushion slip plane obtained by using the digital image correlation technique that tracks the pixels in the images and generates a displacement field. Then a new theoretical analysis has been presented for rigid pile composite foundation. Through comparative studies, it is found that the present method is validated as reasonable by laboratory tests and is in agreement with several current design methods.

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Section: Test Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Load Sharing Behaviour and Cushion Failure Mode for a Disconnected Piled Raft

Zhu

2017

Advances in Materials Science and Engineering

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“…The pressure diffused by the granular layer on pile head mobilizes the negative skin friction on the upper part of the pile shaft ( Fioravante and Giretti [31]). …”

Section: Some Innovative Approachesmentioning

confidence: 99%

A Review on Different Approaches of Piled Raft Analysis

Deka¹

2014

IJIRSET

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ABSTRACT:A raft foundation that supported by piles is proved to be an economical foundation system, if the bearing capacity of the raft is adequate to withstand the loads from superstructure. Then the piles located strategically to support the raft can reduce the both overall and differential settlement of the foundation system. In this paper, different approaches for the analysis of piled raft foundations forwarded by different researchers from time to time are reviewed and their capabilities and limitations are also discussed. Some of the approaches are useful only for preliminary design, while others are useful for detailed design.

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“…Many researchers studied the performance of connected and disconnected piled rafts in sand using centrifugal model tests [8][9][10][11][12][13]. Cao et al [8] and Sawwaf [9] carried out extensive static load tests to study the behavior of connected and disconnected piled rafts under vertical and eccentric loads.…”

Section: Introductionmentioning

confidence: 99%

“…Cao et al [8] and Sawwaf [9] carried out extensive static load tests to study the behavior of connected and disconnected piled rafts under vertical and eccentric loads. Fioravante and Giretti [10], Fioravante [11], and Rasouli et al [12] studied the mechanical and settlement-related characteristics of connected and disconnected piled rafts through a series of centrifugal model tests. Based on the transfer mechanism of load in the case of disconnected pile (DP) rafts, a simplified failure mode involving a cushion and the corresponding theoretical analysis were proposed by Zhu [13].…”

Section: Introductionmentioning

confidence: 99%

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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Contact versus noncontact piled raft foundations

Cited by 80 publications

References 8 publications

Analysis of the Load Sharing Behaviour and Cushion Failure Mode for a Disconnected Piled Raft

Analysis of the Load Sharing Behaviour and Cushion Failure Mode for a Disconnected Piled Raft

A Review on Different Approaches of Piled Raft Analysis

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

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