Método de estimativa de capacidade de carga de estacas em rochas brandas

Abstract

The design of deep foundations excavated in soft rock is usually complex, subsidized by empirical methods and conservative load capacity relations, resulting in oversized and expensive works. Project optimization of pile in soft rock requires the determination of strength and deformability parameters of the rock mass, through difficult and costly field investigations, without ensuring the representativeness of the results. Therefore, this research aimed at the development of a fast and simple methodology for the estimation of the strength capacity of piles in soft rocks, with basis on the numerical modeling of the rock mass, according to GSI code and stress-strain parameters from the of Hoek and Bronw strength criterion, with the aid of finite element software PLAXIS V 8.2. Analytical and numerical data were compared with the results of a field pile load test in shale rocky mass and produced an empirical correlation which proved to be suitable for the design of piles in soft rocks.