Usually, the high-rise buildings exposed to excessive settlement and differential settlement, therefore the shallow foundation system was difficult to be used, so the direction went to the deep foundation's system. One of these systems was the piled raft foundation where both piles and raft carried the applied load. Also, the piles were not only used to carry the loads but also, they were used as settlement reducers because the settlements and differential settlement were the keys of that issue. The piled raft system was a complex system due to different kind of interactions, that's why the advanced numerical simulation was essential. This thesis was focused on 3D analysis by commercial software of PLAXIS 3D.

The purpose of that thesis was to check the validity of the embedded beam model to simulate the piles in PLAXIS 3D. At first, the thesis started with single pile behaviour under both vertical and lateral loads for nonlinear soil case, and measure the stiffness for a linear elastic case and then extended to pile groups and finally the piled raft for linear elastic cases and that compared with the analytical calculations for all cases and the volume pile model in some cases.

Finally, the piled raft system of The Kingdom Tower was studied via embedded beam model for linear elastic and nonlinear cases to estimate the load sharing factor between piles and raft, and determine the settlement and differential settlement in case of applying the gravity loads.