Settlement Analysis of Connected Piled Raft Foundation Under Vertical Loading Using Finite Element Method
摘要
Piled raft foundations have gained widespread popularity in supporting tall structures, both onshore and offshore, due to their recognized economic and structural benefits. Piled rafts have emerged as the preferred foundation system, due to their efficient load-sharing mechanism in contrast to alternative options. However, challenges arise from the complex interaction factors among foundation elements, impacting the load transfer mechanism, and the applied load is partially distributed between the raft and the pile group. This study assesses the performance of a piled raft foundation with respect to serviceability and load-bearing capacity, emphasizing settlement criteria in layered soil through numerical analysis. The main objective is to minimize both average and differential settlements of the raft under these conditions using Plaxis 3D finite element analysis. Multiple pile configurations are assessed under uniform vertical loading to address settlement concerns critical for effective piled raft design. Raft foundations on soft soil settle more under heavier loads, especially when unevenly distributed. Studies showed that using more piles spaced further apart minimized settlement, particularly with a 9-pile configuration. Pile diameter and group width also matter, as wider groups can worsen uneven settlement. While thicker rafts can settle more due to their own weight, piled rafts ultimately settle less to share load-bearing between piles and the raft.