Three-Dimensional Numerical Modelling of Performance of Piled Raft Foundation

Abstract

Because of its intricate three-dimensional soil-structure interaction scheme, which consists of the pile-soil
interaction, pile-pile interaction, raft-soil interaction, and finally the piles-raft interactions, the pile raft foundation
system presents a feasible option for high-rise building foundations. Using the pile raft foundation system concept, many megaprojects have been built in recent years. Consequently, a considerable amount of research has been done to examine and comprehend the behavior of pile raft foundation systems under vertical loading. Pile raft foundations have been shown to be more cost-effective for high-rise structures built on clay (lacustrine), and they can meet serviceability and safe bearing capacity requirements. Strategically placed piles increase the raft's load capacity and lessen differential settlement. We are looking for 3D numerical models to look into these intricate relationships. The piled rafts in the study were set up in lacustrine clay, which has stiffness that changes linearly with depth. Many foundation parameters,
including pile diameter and pile spacing, were examined in detail using a parametric analysis. It is determined how much weight the piled raft can support as well as how the load shearing mechanism works between the raft and the piles. As a result, the numerical analysis's findings are; as the diameter of the piles increased from 0.8 m to 1.5 m, a greater settlement was observed. This settlement increased gradually. The point where the column is provided in the raft component of the piled raft foundation is where the bending moment magnitude reaches its maximum. Sixty-seven percent of the load is carried by the pile, and the remaining thirty-three percent is carried by the raft foundation.