Estudio experimental del efecto de grupo de pilotes cortos excavados en un perfil de suelo granular

Abstract

When designing a project using piles, depending on the distance between them, the behavior of one interferes with the other. This interference occurs in terms of both the carrying capacity and the settlement ratio. Research on the group effect on typical Fortaleza soils is scarce, which justifies and prompts this work. The objective of the present investigation is to evaluate the group effect of piles excavated in a granular profile soil, typical to those that occur in the subsoil of the city of Fortaleza –Ceará– Brazil. For this, 26 piles were emplaced in a field located inside the campus of the Universidade Federal do Ceará (Campus experimental of Geotecnia and foundations of the UFC). Piles were isolated in groups of 2 to 4 piles, varying the distance between them. The subsoil was characterized by the collection of test results that were previously made in the sector. Additionally, a percussion drill excavation (SPT) was performed, with results of resistance indexes (NSPT) corrected based on efficiency estimates. Subsequently, static load tests (PCE) were performed on the groups of piles executed. It is verified that the piles worked only by lateral friction, and the group effect is observed in all the investigated spacings.