Radwan, A., Hasen, A., Gad, S., Deef, K. (2021). 3D NUMERICAL STUDY ON THE BEHAVIOUR OF PILED RAFT FOUNDATION SYSTEM. test, 48(1), 74-84. doi: 10.21608/erjsh.2021.404883
Amr A. Radwan; Abdrady A. Hasen; Samir A. Gad; Kariman S. Deef. "3D NUMERICAL STUDY ON THE BEHAVIOUR OF PILED RAFT FOUNDATION SYSTEM". test, 48, 1, 2021, 74-84. doi: 10.21608/erjsh.2021.404883
Radwan, A., Hasen, A., Gad, S., Deef, K. (2021). '3D NUMERICAL STUDY ON THE BEHAVIOUR OF PILED RAFT FOUNDATION SYSTEM', test, 48(1), pp. 74-84. doi: 10.21608/erjsh.2021.404883
Radwan, A., Hasen, A., Gad, S., Deef, K. 3D NUMERICAL STUDY ON THE BEHAVIOUR OF PILED RAFT FOUNDATION SYSTEM. test, 2021; 48(1): 74-84. doi: 10.21608/erjsh.2021.404883

3D NUMERICAL STUDY ON THE BEHAVIOUR OF PILED RAFT FOUNDATION SYSTEM

Engineering Research Journal (Shoubra)
Volume 48, Issue 1, April 2021, Pages 74-84    PDF (2.67 M)
Document Type: Research articles
DOI: 10.21608/erjsh.2021.404883
Authors
Amr A. Radwan1; Abdrady A. Hasen2; Samir A. Gad2; Kariman S. Deef* 3
1soil mechanics and foundation, Faculty of Engineering, Helwan University, Cairo
2soil mechanics and foundation, Faculty of Engineering, Al- Azhar University, Cairo
3Department of Civil Engineering, High Institute of Engineering, 15 May, Cairo
Abstract
The piled raft system has proved to be a reasonable foundation system compared with the traditional pile foundation systems. However, there is a hesitation for considering the utilization of piled rafts on very loose sand underlain by inclined very soft soil due to limitations concerning insufficient bearing capacity and excessive settlement. Therefore, this study aims to describe the behavior of piled raft on very loose sand underlain by inclined soft clay layer varied between 3 m and 6 m using a 3D finite element approach. A series of numerical analysis was performed to study the behavior of the piled raft foundation system using various factors including raft thickness, pile length, and pile spacing, which are considered for an economical and effective design. The results showed that the length and spacing of piles might affect both bearing capacity and the settlement performance of the raft. In addition, increasing the pile length can decrease the settlement, but after reaching a certain length, the increase in pile length demonstrated the settlement tended to be insignificant. Therefore, to achieve an economic design, it is vital to consider the optimal pile length in the design of raft foundation model according to the allowable settlement.
Keywords
settlement; soft soil; pile length; 3D finite element approach; piled raft foundation
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