NUMERICAL MODELLING OF THE BEHAVIOR OF PILED RAFT FOUNDATION USING PLAXIS 3D FOUNDATION SOFTWARE

Khalid Yousif, Hussein El Arabi

Abstract


This research aims to study behavior of load-settlement and load sharing between piles and raft in combined piled raft foundation by using numerically three - dimensional finite element analysis represented by the commercially finite element package PLAXIS 3D FOUNDATION. A piled raft subjected to concentrated loading for 9 stories building with different configuration of piles length and raft thickness embedded in stiff CLAY. During the course of study, increasing each of the previously mentioned parameters showed a reduction in the average maximum settlement along (this reduction is limited in raft thickness parameter) with increasing in the load sharing by the piles. Also, it was deduced that the effect of increasing the length of piles outweighed the effect of increasing the raft thickness and in term of reducing the average maximum settlement yet, there was an upper limit beyond which the thickness of raft
reach 0.5m becomes adversely effect on reducing settlement, but increase load sharing by the piles. All design parameters using in this study has no significant effect on reducing differential settlement in raft. Increasing in design parameters leads to increase in load sharing by piles.


Keywords


Piled-Raft; Settlement;Load sharing;Pile length;raft thickness

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References


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Katzenbach, R., Arslan, U., Moorman, C. and Reul, O. (1998). “Piled Raft Foundations: Interaction Between Piles and Raft”. Darmstadt Geotechnics, Darmstadt University of Technology, 4: pp279- 296.

B.V, P. Plaxis 3D foundation (Reference Manual)

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