Comparativo de resultados de provas de carga com células expansivas, ensaios bidirecionais, em estacas hélice contínua sem e com problemas em processo executivo (reperfuração)

Abstract

The present paper aims to present the results and their respective analyzes of four tests of static load performed with expansive cells, bidirectional tests, in screwpiles, executed at the same jobsite, with the same characteristics but with one of them submitted to a new drilling and its influence at load capacity of pile. The piles were submitted in a sequence of loading, in stages of 30 minutes, unloading with 10 minutes stages and a new load/unloading with the same procedure. Between the first loading and the unloading the load was maintained for, at least, 12 hours. The results were determined according to the Décourt’s method of stiffness (1996) even to skin friction to end bearing and showed the modifications resulting from a new drilling in a pile when compared to the others executed in a single drilling. The analysis of the results of readings and determined by the method showed that the bidirectional test is an effective tool for performance evaluation of direct foundation and drilling piles and that a screwpile loses skin friction capacity over than 60% when subjected to a new drilling.