Behavior of Model Rafts Resting on Pile-Reinforced Sand

Cao, X. D.; Wong, Ing Hieng; Chang, Ming-Fang

doi:10.1061/(asce)1090-0241(2004)130:2(129)

Cited by 76 publications

(27 citation statements)

References 4 publications

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“…Recently, the characteristics of piled rafts were investigated by performing tests of model rafts resting on pile-reinforced sand [17] and centrifuge experiments [18] with small-scale models.…”

Section: Optimization Methodsmentioning

confidence: 99%

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Xie

Chi

2019

Advances in Civil Engineering

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Important buildings such as nuclear power plants always require stricter control of differential settlement than ordinary buildings. Therefore, it is necessary to provide an optimized design for the piled raft foundations of important buildings. In this paper, a new optimization method (using different pile diameters and different pile spacing) was proposed for the design of piled raft foundations. This method adjusts the pile diameters and pile spacing according to the stress distribution at the pile top of the initial design to achieve a more uniform settlement of the raft and stress distribution on top of piles, which can solve the differential settlement problems caused by uneven loads of the superstructure. After optimized design, the differential settlement and integral bending moment of the raft decreased more than 64% and 52%, respectively, and the differential stress on top of piles decreased by at least 63%. The new method proposed in this paper could be applied to large-scale piled raft foundations with complex superstructure loads.

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Section: Optimization Methodsmentioning

confidence: 99%

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Xie

Chi

2019

Advances in Civil Engineering

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“…Previous experimental and numerical analyses indicated that the disconnecting layer plays a significant role in distributing superstructure loads in such an interplay that integrates the piles and the soil in load sharing mechanism [9] [10]. In this case, the piles receive the upper load indirectly and mostly considered as stiffeners of the marginal ground or settlement reducers [11]. Many researches are now being done to understand the complex soil-structure interaction (SSI) phenomena in disconnected piled rafts [12] [13] [14] [15].…”

Section: Introductionmentioning

confidence: 99%

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

Uge¹,

Guo²

2020

OJCE

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Foundation pit excavation engineering is an old subject full of decision making. Yet, it still deserves further research due to the associated high failure cost and the complexity of the geological conditions and/or the surrounding existing infrastructure around it. This article overviews the risk control practice of foundation pit excavation projects in close proximity to existing disconnected piled raft. More focus is given to geotechnical aspects. The review begins with achievements to ensure excavation performance requirements, and follows to discuss the complex soil structure interaction involved among the fundamental components: the retaining wall, mat, piles, cushion, and the soil. After bringing consensus points to practicing engineers and decision makers, it then suggests possible future research directions.

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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. 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.…”

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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Behavior of Model Rafts Resting on Pile-Reinforced Sand

Cited by 76 publications

References 4 publications

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Deep Foundation Pit Excavations Adjacent to Disconnected Piled Rafts: A Review on Risk Control Practice

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

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