Estimativa de parâmetros geotécnicos de resistência ao cisalhamento por meio de correlações empíricas com o ensaio SPT: estudo de caso: IFMG – Campus Santa Luzia (MG)

Abstract

Geotechnical site investigation is a fundamental step in Civil Engineering projects, as soil characteristics directly influence the safety and performance of structures. In Brazil, the Standard Penetration Test (SPT) is widely used due to its simplicity and relatively low cost, providing the dynamic penetration resistance index (NSPT) as its main result. However, this test does not directly provide essential shear strength parameters, such as the internal friction angle and cohesion, which are required for stability analyses and foundation design. In this context, this undergraduate thesis aims to estimate the shear strength parameters of the soil at the IFMG – Campus Santa Luzia (MG), through the application of empirical correlations based on SPT results, with emphasis on borehole SPT-04. Field investigation data were analyzed and corrected for energy efficiency, and laboratory tests were carried out, including grain size analysis, Atterberg limits, hydrometer test, and determination of the specific gravity of soil particles. The results indicated that the studied soil presents low plasticity, a significant sand and silt fraction, and behavior typical of silty-clayey residual soils. The application of empirical correlations allowed the estimation of shear strength parameters, with the correlations proposed by Alonso (2010) providing more conservative and coherent results. It is concluded that the integration of field and laboratory tests is essential for reliable geotechnical interpretation and that SPT-based correlations are valid tools when applied with proper technical judgment.