SUMMARY:

The uncontrolled growth of urban areas causes the occupation of geotechnical hazard zones. This work addresses the geotechnical characterization of a large and steep rock slope in a recently inhabited zone in the Cabanas neighborhood, municipality of Mariana. The slope is composed of a quartzite in the Itacolomi Group and exhibits unstable blocks. The downstream area is occupied, suffering a considerable rockfall risk. For a rockfall hazard evaluation, the Rockfall Hazard Rating System (RHRS) was applied, which was originally conceived for roadway slopes, in order to select those sectors with remediation priority. Therefore, the original method has been adapted in this work for urban slopes. For this reason, some of the parameters used in the original method were modified and adapted to the new situation. Other parameters were not considered, due to their non-applicability. This work applies the Rock Mass Rating System (RMR), instead of the original geological feature parameter, to represent the mechanical behavior of the rock mass and addresses a detailed characterization of the block catchment areas. The slope was divided into sectors, and for each sector the RMR and the block falling index were assessed. The calculation results showed that the height of the slope and the catchment area characteristics were the determining factors in the rockfall hazard.

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