Comparative Analysis of the Behavior of a Piled Raft and Corresponding Pile Groups

摘要

The aim of the present work is to compare the behavior between a piled raft and a group of piles. The analysis of the addition of a raft into a group of piles allows understanding the influence of the raft-soil interaction in the improvement of the piles capacity. Calculations and corresponding analysis are made regarding the piles and raft capacities, giving significant accuracy, while the association of piles with a raft gives a large benefit on the global foundation performance. This better understanding of the behavior, has been followed by analyzing how the interaction between raft-pile and pile-soil increases the stress state in the soil confined between the piles in the upper soil strata levels and how this improves the shaft resistance in these more superficial horizons. The results obtained shows that these interactions improves the performance of the foundation system, resulting from the increase of the soil confinement due to the loads applied. These multiple analyses were obtained by cross-comparing results, for two numerical codes: the RS3® from RockScience and FB-Multipier® from BSI which revealed a very important tool for this type of assessment.