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Year : 2013  |  Volume : 3  |  Issue : 1  |  Page : 31-35

Behavioural Study of Piled Raft Foundation in Layered Deposits of Soft Soils

Department of Applied Mechanics, Sardar Vallabh Bhai National Institute of Technology, Surat, Gujarat, India

Correspondence Address:
Shruti J Shukla
Department of Applied Mechanics, Sardar Vallabh Bhai National Institute of Technology, Surat, Gujarat
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0976-8580.107098

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A piled raft foundation is a combination of a shallow foundation and a deep foundation with the best characteristics of each of its components. The piled raft foundation is a composite construction consisting of three bearing elements, piles, raft, and subsoil. Unlike the traditional design of foundation where the load is carried either by the raft or by the piles, in the design of a piled raft foundation the load share between the piles and the raft is taken into account. In this foundation, the piles usually are not required to ensure the overall stability of the foundation but to reduce the magnitude of settlements, differential settlements and the resulting tilting of the building and guarantee the satisfactory performance of the foundation system. The bearing behavior of a piled raft foundation is characterized by complex soil-structure interactions (Katzenbach, et al., 1998). The modeling of these interactions requires a reliable and powerful analysis tool, such as the finite element (FE) method in combination with a realistic constitutive law. Different researches have been realized investigations about the numerical modeling of piled rafts with FE analysis and different constitutive models. The present research combines the 3D modeling with a modern and realistic constitutive model. An increasing number of structures, especially tall buildings are founded on piled rafts (O'Neil, et al., 1996; Katzenbach, et al., 2000; Poulos, 2001). For this reason, it is important to develop a methodology to study the bearing behavior of piled rafts. In this paper, different parameters of piled raft foundation such as diameter of the piles and thickness of rafts are discussed. It is incorporated with computational modeling of piled raft foundation.

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