Modelling of Piled Raft Foundation on Soft Clay

Abstract

This study relates to the analysis of un – piled and piled raft foundations with soft clay soil conditions.
The subsoil model was assumed uniform underneath the foundation with soil stiffness increasing with depth.
Based on these variables a finite element analysis was conducted on un – piled and piled raft foundation. For the
un – piled raft, a 8m × 8m raft size with variable thickness varying from0.25m, 0.4m, 0.8m and 1.5m were
considered in this study. As for the piled raft, first, an 8m × 8m piled raft size with thickness that varies from
0.25m, 0.4m; 0.8m and 1.5m were considered. Secondly, a piled raft with raft thickness of 0.8m, while the piles
spacing is varied as 3d, 4d, 5d, 6d and 7d were considered. The piles are 0.7m diameter and 16m length. For the
aforementioned examples; walls were involved in the analysis to study the effect of superstructure. A single value
of loading intensity was considered at raft level as 215 KN/m2, whereas line load was considered at level of wall
as 385 KN/m. Comparisons were conducted between the various cases and conclusions are made.