Ensaios de campo e de laboratório na obtenção de parâmetros para cálculo de fator de segurança de um talude urbano em Areia - PB.

Abstract

It is common, in Brazil, especially in rainy periods, the occurrence for landslides, which are surfaces of the ground that have inclination in relation to the horizontal plane. Such events can cause fatalities, in addition to financial losses. The population increase, with a consequent decrease in the useful space for new buildings in urban centers, combined with conditions of financial vulnerability, end up leading to housing construction in places that are subject to these occurrences. Currently, there are several methods available to study the stability of soil massifs. This work aims to analyze the stability of a slope located at Rua João Lourenço, in the city of Areia-PB, through the use of two different methods of analysis to determine the safety factor of the structure. We sought to analyze the influences presented on the stability of the slope by obtaining soil parameters through the SPT and direct shear tests, as well as the use of rigorous and non-rigorous stability analysis methods. A comparative analysis of the results was carried out, seeking to identify the possible risk of landslide in the study site, where it was found that the slope presents instability when it is saturated. In addition, it was observed that for the slope in question, the type of method used to calculate the stability did not show any influence on the results, differently from the type of test used to obtain the soil resistance parameters, where there was influence. The analysis of the results showed that the direct shear test allowed the obtaining of safety factors representative of the slope, as well as for the use of the friction angle values obtained by correlations with the SPT result. However, the values obtained from the undrained resistance (Su) led to unrepresentative safety factors. After verifying the instability of the embankment, interventions were cited that guarantee the safety of the embankment and, consequently, of the residents of the locality, such as the execution of earthworks and construction of containment structures.