Análise de métodos semi-empíricos nacionais e internacionais para determinação da capacidade de carga axial em estacas tipo raiz

Abstract

This paper presents a comparative analysis of the results obtained from the application of national and international semi-empirical methods for calculating the bearing capacity of the soil-pile system, using as reference the value obtained by instrumented static load tests. Therefore, two root piles with 310mm of diameter and 6m of length were constructed on the experimental field of the University of Fortaleza (UNIFOR). The soil parameters needed for the calculation were obtained from standard penetration test (SPT) performed on site, and the soil was characterized mainly as silty sand. The load x settlement curve analysis to predict the bearing capacity of the soil-pyle system was made by the method of Van der Veen (1953). The following methods were used to determine the bearing capacity of the soil-pile system: Aoki and Velloso (1975), Décourt and Quaresma (1978), Cabral (1986), Philipponnat (1980), Bustamante and Gianeselli (1982) and Viggiani (1993). The results from the semi-empirical methods were shown considering the distribution of the ultimate load in the toe and shaft resistances. It was verified that the semi-empirical methods that presented the closest results to the static load test were the methods of Philipponnat (1980), Bustamante and Gianeselli (1982) and Cabral (1986).