Análise de métodos de estimativa de capacidade de carga e tensão admissível a partir de ensaios de prova de carga em placa em solo arenoso

Abstract

The present work was based on theoretical and semi-empirical methods analysis used to estimate the bearing capacity and allowable stress of the soil-foundation system from plate load tests in sandy soil. It carried out standard penetration test with the measurement of the soil penetration resistance index (NSPT) on each base intended for the construction of a circular footing. The theoretical methods of Terzaghi (1943) and semi-empirical methods from the Architectural Institute of Japan (2001) and Teixeira (1996) were used to estimate the bearing capacity and the allowable stress of the soil-plate system. It used the Van Der Veen (1953) method to determine the bearing capacity since none of the direct load tests showed clean or physical failure. The analysis of the results occurred from the obtained values, comparing the bearing capacity and the allowable stress estimated by the studied methods with the values observed in the plate load tests. It notices that the methods of Terzaghi (1943) and the Architectural Institute of Japan (2001) tended to underestimate the resistance capacity of the soil even when they present less dispersed percentage differences about the plate load tests. The method of Teixeira (1996), in turn, showed the best behavior, estimating values close to those observed in the field. The method showed the greatest variability, making it difficult to establish the ideal conditions for its application.