3D Numerical Model for Piled Raft Foundation

Sinha, Anup; Hanna, Adel

doi:10.1061/(asce)gm.1943-5622.0000674

Cited by 95 publications

(33 citation statements)

References 13 publications

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“…As shown in Figure 9, the corresponding load pressures for this settlement range were about 180 to 400 kPa and 300 kPa to 800 kPa for very stiff and hard clay, respectively. It is observed that within these ranges, the relationship between settlement and load pressure is still relatively linear, consistent with the results of other researchers, such as [17]. The differential settlements of the raft foundation for both soil consistencies are shown in Figure 10.…”

Section: Effect Of Raft Sizesupporting

confidence: 89%

An Evaluation of Pile-Raft Interaction in Cohesive Soils using 3D Finite Element Method

Susila

Syahputra

Sahadewa

et al. 2019

J. Eng. Technol. Sci.

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This paper presents the results of a numerical study of soil-structure interaction in a piled-raft foundation system in clay soil by reviewing the deformation and load transfer mechanism of the piled-raft foundation system. ABAQUS was used to evaluate the interaction in the system, while a Mohr-Coulomb constitutive model was chosen to model the clay soil. Verification of the model was conducted by comparing the simulation result to an experimental laboratory result. The verification result showed that the model used in this research agreed well with the experimental laboratory research. Subsequently, a parametric study was performed by varying the pile spacing, raft size, pile length, and raft thickness. A parametric study was conducted on very stiff and hard clays. This study concludes that the load transfer mechanism in a piled-raft foundation system between the pile and raft foundation occurs after the pile reaches its ultimate capacity and is in the plastic zone.

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Section: Effect Of Raft Sizesupporting

confidence: 89%

An Evaluation of Pile-Raft Interaction in Cohesive Soils using 3D Finite Element Method

Susila

Syahputra

Sahadewa

et al. 2019

J. Eng. Technol. Sci.

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“…is study demonstrated that a concentrated pile arrangement can considerably reduce the total settlement, differential settlement, and bending moments of the raft; moreover, the effects of various parameters, such as the pile length, pile number, and raft thickness, on the behavior of the piled raft were also investigated. Sinha and Hanna [20] investigated the effects of pile diameter and pile spacing on PRF. e conclusions of these studies are presented in Table 1.…”

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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“…Also, the load-sharing ratio increases with increases the pile spacing. The maximum bending moment and shear force are noted to be less in piled-raft foundation than that of raft foundation or pile group analysis [5][6][7][8][9]. The present study is a case study focused on reanalyzed a constructed raft and piles to calculate the allowable carrying capacity of piles and apply SAFE 12 software to analyze the system as piled-raft instead of analysis the system as pile group.…”

Section: Introductionmentioning

confidence: 93%

Numerical Evaluation of Foundation of Digester Tank of Sewage Treatment Plant

Karkush

Aljorany

2019

Civ Eng J

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In the present study the foundation of digester tank, main part of sewage treatment plant, is reanalyzed analytically and numerically to check the adequacy of such foundation to support superstructure loading. The foundation of digester tank consists of raft foundation and bored piles. The diameter of raft is 33 m and thickness of 1 m, while the piles are bored type of diameter 0.6 m and length 15 m. After testing eleven working piles, it is found that three piles cannot support a load of 1.5 times the working load (1305 kN) safely or in other words the factor of safety of these failed piles is less than 1.5. The results of filed pile tests are reanalyzed using two well-known methods, Davisson’s method and Brinch-Hansen method to check the ultimate carrying capacity of tested piles. Also, this paper includes analysis of previous soil investigation report and conducting additional soil investigation by drilling three boreholes to secure the soil parameters used in the analytical and numerical analysis of digester tank foundation. SAFE 12 software is used to analysis the foundation of structure as piled-raft instead of pile group to interest from the interaction between soil and raft foundation. The results of analysis showed that the piles failed in the tests can support its share of the superstructure load by a factor of safety 1.8 and the piles success in the field tests can support its share of the superstructure load by a factor of safety not less than 2.86. Also, the settlement under structure will be less than 100 mm, where using piled-raft analysis reduces the settlement to be within allowable limits.

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3D Numerical Model for Piled Raft Foundation

Cited by 95 publications

References 13 publications

An Evaluation of Pile-Raft Interaction in Cohesive Soils using 3D Finite Element Method

An Evaluation of Pile-Raft Interaction in Cohesive Soils using 3D Finite Element Method

Optimization Method for Irregular Piled Raft Foundation on Layered Soil Media

Numerical Evaluation of Foundation of Digester Tank of Sewage Treatment Plant

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