Mapeamento da susceptibilidade de movimentos de massa no perímetro urbano da cidade de Francisco Beltrão - Paraná

Abstract

This work aimed to evaluate the landslide susceptibility in the urban area of the Francisco Beltrão city - PR, using methodology as a probabilistic analysis of the safety factor. It started from the principle that there are areas unsuited for civil construction in the study area due to the instability of the terrain. A database was assembled for SIG processing, based on altimetry, satellite images, standard penetration test - SPT and physical and geotechnical analysis of the soil in place. Then was generated four safety factor maps comparing the natural and saturated soil and the influence of vegetation thereon. Unstable areas were identified in the studied perimeter, and its higher concentration to the saturated soil case without influence of vegetation. Furthermore, it was found that the soil showed higher incidence of unstable areas was Chernosoil class, and slope with the highest concentration of unstable points was between 20 - 30% gradient. In conclusion, to this study area vegetation on the slopes has great importance for stability. This work contributes to the municipality of Francisco Beltrão, being the first slope stability study for the entire urban area and can guide public policies of urban land use, with suitable areas to urban occupation and permanent preservation, aimed at greater security to the population and the environment.