Influence of raft rigidity for piled rafts resting on stratified subsoil

Gebregziabher, Henok F.; Achmus, Martin

doi:10.1080/19386362.2020.1809839

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…e effect of raft-soil relative stiffness shows a similar effect on both connected and nonconnected piled raft foundations, as shown in Figure 9. Figure 9(a) shows that the maximum settlement initially decreases with raft thickness (stiffness) and increases very slightly after reaching the limiting raft thickness (around K rs of 1.182 for 9NC1.0 and 3.988 for 9PR in this study), i.e., tr � 1.5 and tr � 1.25 m. is is because increasing the raft thickness beyond the limit (optimum thickness) gives excessive weight to the raft and leads to additional settlement [32]. As a comparison, normalized differential settlement (ΔS/B) and normalized maximum settlement (S max /B) of nonconnected piled rafts are lower than connected piled rafts in the case of the large piled raft (Br/Lp > 1).…”

Section: Relative Raft-soil Stiffnessmentioning

confidence: 51%

“…e stiffness of the raft is the main factor that controls the performance of piled rafts; it influences the interactions of the raft with the piles and the soil [32]. e raft-soil relative stiffness (K rs ) greatly influences the differential settlement of a piled raft foundation.…”

Section: Relative Raft-soil Stiffnessmentioning

confidence: 99%

“…Regarding this, it was recently [32] reported that stiffening the raft excessively may not guarantee the effective reduction of the differential settlement, especially when the piles are closely spaced. A similar finding has been also reported by [35,36].…”

Section: Relative Raft-soil Stiffnessmentioning

confidence: 99%

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Improved Performance of Raft Foundation Using Detached Pile Columns in Loose Subsoil Conditions

Melese

2022

Advances in Civil Engineering

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Piles act as settlement reducers in case of connected piled-raft foundation and hence decrease the settlements of the raft. The design concept of the connected piled-raft foundations is to lessen the number of piles and utilize the bearing capacity of the system piled raft. Due to significant straining actions at the pile head-raft connection, an alternative technique is proposed to disconnect the piles from the raft. A granular layer (cushion) beneath the raft is incorporated. The disconnection has a beneficial effect on reducing axial load compared to connected piles. For small piled rafts, nonconnected piled rafts show less stiffness than connected piled rafts, and the soil is highly stressed and shows greater raft settlement. In the case of the large piled raft, nonconnected piled rafts show greater settlement efficiency. Cushion stiffness was realized to be more substantial for a nonconnected piled raft with shorter piles than one with longer piles. The results show that the load transfer mechanism in a nonconnected piled raft is mainly governed by the thickness and stiffness of the cushion layer and by the stiffness of the subsoil.

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Section: Relative Raft-soil Stiffnessmentioning

confidence: 51%

Section: Relative Raft-soil Stiffnessmentioning

confidence: 99%

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Improved Performance of Raft Foundation Using Detached Pile Columns in Loose Subsoil Conditions

Melese

2022

Advances in Civil Engineering

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Settlement of Wind Turbine Resting on Different Foundations Systems in Zafarana, Egypt

Alshaba,

Hassona,

Hassan

et al. 2024

Indian Geotech J

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Analysis of the geotechnical behavior of a piled raft in tropical lateritic soil based on long-term monitoring of columns, piles, and raft–soil interface

et al. 2024

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This paper aims to analyze and describe the geotechnical behavior of a piled raft foundation of a tall building (53 floors, 172.4 m high) through the monitoring of strains in the building’s columns and piles, the stresses at the raft-soil interface, and the foundation settlements. Field and laboratory tests were performed, and associated with axisymmetric and three-dimensional finite element analysis to the assessment of the measured data. The monitoring of the pile strains suggests the occurrence of soil expansion, caused by the raft excavation process, up to approximately six months after the excavation was completed. The presence of different soil profiles under the raft, with different mechanical properties, affected the distribution of the foundation settlements and the pile loads. Initially, the average pile loads were concentrated in the perimeter elements, but, as the construction of the building evolved, they tended to become more uniform. The effect of the superstructure stiffness caused successive load redistributions in the columns, which contributed to the maintenance of the maximum angular distortion of the building within the allowable values and reduced the load difference between the piles positioned in opposite soil profiles.

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Influence of raft rigidity for piled rafts resting on stratified subsoil

Cited by 3 publications

References 23 publications

Improved Performance of Raft Foundation Using Detached Pile Columns in Loose Subsoil Conditions

Improved Performance of Raft Foundation Using Detached Pile Columns in Loose Subsoil Conditions

Settlement of Wind Turbine Resting on Different Foundations Systems in Zafarana, Egypt

Analysis of the geotechnical behavior of a piled raft in tropical lateritic soil based on long-term monitoring of columns, piles, and raft–soil interface

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