ESTUDO COMPARATIVO DE FUNDAÇÕES EM EDIFÍCIO ALTO: ESTACAS HÉLICE CONTÍNUA VERSUS ESTACAS ESCAVADAS COM FLUIDO ESTABILIZANTE EM GOIÂNIA

Abstract

The rapid urbanization has led to the construction of increasingly tall buildings, demanding foundation solutions to access more resistant layers. In the Brazilian central-west region, continuous flight auger piles have been commonly used for load-bearing capacity, while piled raft concepts have been employed to predict settlements. However, in recent years, largediameter bored piles with stabilizing fluid have emerged as alternative foundation solutions, allowing for higher load dissipation and making use of available equipment. This study presents a case study on the economic feasibility of two foundation methods, namely continuous flight auger piles and bored piles with stabilizing fluid, for a 38-story building in Goiânia. Geotechnical aspects, structural demands, concrete volume for piles and pile caps, reinforcement quantities, labor, and other inputs were considered. The large-diameter bored piles demonstrated economic feasibility in terms of inputs, although a longer construction schedule was required. It is also emphasized the importance of conducting instrumented static load tests as a measure of control and verification of actual behavior. Furthermore, it was observed that continuous flight auger piles can be advantageous when designed following piled raft design philosophies.