Contribuição ao estudo do efeito do melhoramento de depósitos arenosos através da utilização de ensaios de placa.

Abstract

The technique of improvement of sandy deposits with compacting piles has been widely used in the cities of Joao Pessoa/PB and Recife/PE, However, few researches have been developed to evaluate the real geotechnical behavior of these improved soils. The objective of this thesis is, through rehearsals in situ, to analyze the strength increase obtained after the improvement of the soil, as well as, to evaluate the mechanism of load transfer of a foundation settled in this soil. To accomplish this rehearsals SPT (Standard Penetration Test) and load tests on plates were done. In order to obtain the load x settlement curve of the improved soil, it was supposed that the foundations established in this soil type, would behave as mixed foundations, that is, in a similar way to pile-raft. The difficulties found in the accomplishment of some load tests, limited the interpretation of the obtained results. It is possible that the compacting piles, when solicited, do not behave in a similar way to the traditional displacement piles. Regarding to the improvement technique used in the cities selected for this study, it corifirmed what the technical literature affirms that it is very efficient when executed in compatible sand deposits with this technique, having been projected footings for 400kPa to SGOkPa of tax in the improved deposit.