Optimal pile arrangement for minimizing differential settlements in piled raft foundations

Kim, Kyung Nam; Lee, Su-Hyung; Kim, Ki-Seok; Chung, Choong-Ki; Kim, Myoung Mo; Lee, Hae Sung

doi:10.1016/s0266-352x(01)00002-7

Cited by 76 publications

(30 citation statements)

References 4 publications

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“…In such cases, the optimisation of piled rafts should be performed using varying pile lengths and arrangements according to the subjected load type in order to reduce the interaction among equal-length piles and improve the overall foundation performance. Some previous researches have been devoted to optimise the design of piled rafts by varying pile size and pile configuration including Horikoshi and Randolph (1996), Kim et al (2001), Leung, Klar, and Soga (2010), Nguyen et al (2014) and Taghavi Ghalesari, Barari, Fardad Amini, and Ibsen (2015). Nevertheless, a few studies have considered a combined pile size and arrangement optimisation.…”

Section: Optimum Designmentioning

confidence: 99%

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Ghalesari

Choobbasti

2016

European Journal of Environmental and Civil Engineering

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Piled raft foundations are the composite construction of a spread foundation and a few number of piles that are usually used in soft soils to compensate the weakness of a raft in satisfying the design requirements. Due to the complex behaviour of piled raft, it is necessary to take into account a number of factors such as pile geometry and arrangement, raft thicknesses, soil properties and loading condition in the design. In this study, a parametric study has been conducted by a three-dimensional finite-element method considering the full interaction between the components of piled raft foundation. The underlying soil consists of Babol clay in drained condition with various stiffness and plasticity, determined from the results of a geotechnical investigation. The results of numerical analyses show that the bearing capacity of piled raft obviously increases with increasing pile length, pile spacing and raft thickness, especially in stiff clay. The effect of load type is more significant for the differential settlement and pile loads than other parameters. Finally, the advantages of using an optimum design method are examined in a special case of analyses and a case history.

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Section: Optimum Designmentioning

confidence: 99%

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Ghalesari

Choobbasti

2016

European Journal of Environmental and Civil Engineering

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“…The aim of these design criteria is to minimize the total pile length and arrange the piles such that the maximum and differential settlement criteria are addressed, so as to improve the economic feasibility of offshore piled rafts. The optimum arrangement was chosen based on the pile arrangement scheme proposed by Kim et al [39], and is indicated in Fig. 14a as optimum 1.…”

Section: Design Criteria Concerning the Required Pile Lengthmentioning

confidence: 99%

Development of optimum design from static response of pile–raft interaction

et al. 2014

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Piled raft foundations are among the most commonly used support structures for offshore projects. When a raft foundation alone does not satisfy the design requirements, piles may be added to improve the ultimate load capacity and the settlement performance of the raft. In this study, design criteria were developed for the undrained behavior of a piled raft system based on an examination of average and differential settlements, raft bending moment, and pile butt load ratio. Raft settlements were evaluated by a series of three-dimensional finite element analyses. The average settlement values for the piled raft were highly influenced by the number of piles and the raft thickness. Optimal design configurations of piles for cohesive soils are discussed. Increasing the pile spacing decreased the pile butt load ratio by allowing for a more uniform load distribution between the piles.

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“…A few studies were conducted on the optimization of piled raft design. Chow and Thevendran (1987), Horikoshi and Randolph (1998), Valliappan et al (1999), Liu and Chi (2000), Kim et al (2001), Chow and Small (2006), Liang et al (2009) and Leung et al (2010) attempted to optimize the pile-raft system by varying design parameters, such as raft thickness, pile size, and arrangement. Chan et al (2009) and Hwang et al (2011) proposed some advanced optimization methods for the piled groups.…”

Section: Introductionmentioning

confidence: 99%

A Note on Pile Length Optimization of Pile Groups Considering the Non-Linear Behavior of Piles

Liang¹,

Chen²,

Song³

et al. 2014

Ground Improvement and Geosynthetics

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The use of dissimilar piles below a raft is a relatively innovative concept and can optimize the design of a piled raft. This paper discusses a pile length optimization method. To analyze non-linear behaviour of piles, a "cut-off" method was adopted to limit pile capacity in the integral equation considering linear behaviour of piles. In this method, adjacent non-yielding piles take more loads when some piles start to yield (i.e., reaching their individual ultimate load capacity). A pile-square rigid raft system was analyzed to illustrate the effects of the proposed approach. The analysis showed that the stiffness of the piled raft decreased after considering the load cut-off. The load cut-off procedure could make the distribution of the reactions for short piles more reasonable in terms of their locations and lengths. The optimized design using dissimilar piles would create a more economical solution than the design with uniform piles.

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Optimal pile arrangement for minimizing differential settlements in piled raft foundations

Cited by 76 publications

References 4 publications

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Numerical analysis of settlement and bearing behaviour of piled raft in Babol clay

Development of optimum design from static response of pile–raft interaction

A Note on Pile Length Optimization of Pile Groups Considering the Non-Linear Behavior of Piles

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