Análise de prova de carga estática em estaca embutida em rocha no estado do Mato Grosso do Sul

Abstract

The determination of the load-bearing capacity of piles embedded in rock is generally estimated using semi-empirical methods. These methods commonly use the degree of fracturing of the rock mass and the uniaxial compressive strength of samples collected from rotary boreholes. In general, the strength of rock piles is governed by lateral friction for foundations with lengths greater than four times their diameter. This work aims to analyze the load-bearing capacity and settlements of a root pile embedded in rock using a numerical model and semi-empirical prediction methods. The predicted results were compared with the data obtained from the static load test. The load test modeling was carried out using the finite element method through PLAXIS 3D software. Additionally, a geological investigation was conducted through rotary drilling, which provided assessments of basalt rock core samples, RQD (rock quality designation), parameters, recovery rates, and rock quality. Uniaxial compression tests and modulus of elasticity tests were also performed on the rock core samples. The average compressive strength of the samples was ~40 MPa, with RQD ranging from 0 to 100%. Finally, evaluations and interpretations of the data obtained from the static load test are presented, as well as a comparison of the field results with different methods of predicting the load-bearing capacity of piles embedded in rock.