A numerical study of piled raft foundations

Lin, Der‐Guey; Feng, Zuo-Hua

doi:10.1080/02533839.2006.9671208

Cited by 18 publications

(6 citation statements)

References 3 publications

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“…An approximate analysis for piled raft foundations for the vertical load was carried out by Ta and Small [8]. It is observed that most of the recent literatures [9][10][11][12][13][14][15] concentrated on the study of piled raft foundations under vertical loads only. Chaudhary [16] investigated the effectiveness of pile foundation in reducing 2 ISRN Civil Engineering settlement by comparing the results of piled raft foundation and the raft foundation alone.…”

Section: Background Of the Problemmentioning

confidence: 99%

Effect of Dynamic Soil-Structure Interaction on Raft of Piled Raft Foundation of Chimneys

Jayalekshmi

Jisha

Shivashankar

et al. 2014

ISRN Civil Engineering

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This paper presents numerical analysis of soil-structure-interaction (SSI) of tall reinforced concrete chimneys with piled raft foundation subjected to El Centro ground motion (1940) using finite element method. Seismic analysis in time domain was performed on the basis of direct method of SSI on the three-dimensional SSI system. The chimney, foundation, and soil were assumed to be linearly elastic in the analysis. The stress resultants and settlement of raft of piled raft foundation were evaluated under different soil properties and different geometrical features of raft and chimney. Soil properties were selected based on the shear wave velocity corresponding to sand in the loose to dense range. Chimneys with different elevations of 100 m, 200 m, and 400 m were taken with a ratio of height to base diameter of chimney of 17. Raft of different thickness was considered to evaluate the effect of stiffness of foundation. Results were analysed to assess the significance of characteristic of the ground motion. It is found that the response in the raft depends on the different parameters of chimney, foundation, and soil. It is also found that the higher modes of SSI system are significant in determining the response in the raft.

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Section: Background Of the Problemmentioning

confidence: 99%

Effect of Dynamic Soil-Structure Interaction on Raft of Piled Raft Foundation of Chimneys

Jayalekshmi

Jisha

Shivashankar

et al. 2014

ISRN Civil Engineering

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“…Finite element method was used to predict the response of piled raft foundation by Reul et al (2003Reul et al ( , 2004, Reul (2004) [20][21][22][23][24][25][26][27][28][29][30]. In addition, the application of centrifuges to model the response of piled raft foundation was also conducted by Horikoshi et al (1996Horikoshi et al ( , 1998, Vincenzo Fioravante (2008), etc.…”

Section: Introductionmentioning

confidence: 99%

3d Finite Element Analysis of the Effect of Raft Thickness, Pile Spacing, and Pile Length on the Behavior of Piled Raft Foundation

Cao¹

2022

GEOMATE

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Piled raft foundations can be effectively used when their hardness and bearing capacity are estimated sufficiently, and the total settlement, or the differential settlement, of the rafts, stays within a certain limit value. This research applies a 3D finite element method to analyze the response of the flat raft foundation when a minimum number of piles is installed under the raft foundation. The results show that when the pile length changes alternately (between the long pile and short pile), the settlement, the differential settlement, positive and negative moments, and the maximum shear force of the raft increase. The distance between the piles plays an important role in the performance of the piled raft foundation when the pile length is changed. It has a strong influence on the maximum settlement, differential settlement, bending moment of the raft, and distributes the load applied on the pile. In addition, the configuration of the piles is an important factor in the design of piled raft foundations. One reasonable pile configuration includes short piles being placed on the outside, and pile length being increased gradually from the outside to the center of the raft. The raft can also significantly influence the settlement between the center and the rim of the raft. When the thickness of the raft is increased to a certain value, the level of settlement is not significant. On the other hand, the raft's thickness has a small influence on the settlement of the piled raft foundation, it can affect the bending moment of the raft.

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“…Similarly, many researchers have studied piled raft foundation systems. It has been reported that by increasing the pile length, pile diameter, aspect ratio, number of piles, and raft foundation thickness, the overall performance of piled raft foundations improves considerably (e.g., El-Garhy et al, 2013;Lin and Feng, 2006;Mali and Sing, 2020;Sinha and Hanna, 2017;Vu et al, 2014;Xie and Chi, 2020).…”

Section: Introductionmentioning

confidence: 99%

Geotechnical performance of combined stone columns and piles capped with reinforced concrete raft foundation in soft clay soil

Ahmed¹

2022

Acta Geodynamica Et Geomaterialia

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Stone columns consist of granular material compacted in long cylindrical holes. They are used for improving the strength and consolidation characteristics of compressible soils. However, they are still less effective at supporting heavy loads, since they still cannot transfer applied stresses to deeper layers of soil. The main objective of this numerical study was to investigate the geotechnical performance of a combined foundation system composed of stone columns and piles grouped together under a rigid raft foundation in compressible soil. The failure mechanism of this hybrid foundation system was examined, and configurations optimizing the performance of the combined foundation system were explored. An analytical model was developed for predicting the ultimate carrying capacity of the combined system in compressible soils. It was deduced that combining stone columns and piles in one foundation system improved considerably the system’s carrying capacity. Moreover, the uppermost improvement was observed when the piles were installed on the periphery or edge of the raft foundation, while stones columns were placed at the center area of the raft. The failure of the combined foundation system started from the center of the raft and noticeably extended to its edges. Due to the presence of stone columns in the combined foundation system, the piles did not interact. The areas affected or influenced by the soil–pile interaction also did not overlap.

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A numerical study of piled raft foundations

Cited by 18 publications

References 3 publications

Effect of Dynamic Soil-Structure Interaction on Raft of Piled Raft Foundation of Chimneys

Effect of Dynamic Soil-Structure Interaction on Raft of Piled Raft Foundation of Chimneys

3d Finite Element Analysis of the Effect of Raft Thickness, Pile Spacing, and Pile Length on the Behavior of Piled Raft Foundation

Geotechnical performance of combined stone columns and piles capped with reinforced concrete raft foundation in soft clay soil

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