Classificação geomecânica de talude no perímetro urbano de Cuiabá-MT

Abstract

This study characterized and classified a slope located in the urban area of Cuiabá/MT using the RQD, RMR, Q Index and GSI systems. The methodology included three main stages: geological-geotechnical mapping, data processing and analysis, and geomechanical classification of the slope. To describe the rock mass, a 19.5 m long scanline was drawn, in which 24 discontinuities were identified. These discontinuities were grouped into five families using Dips 7. Since no core samples were available, the RQD was determined using the Jv parameter, obtaining an RQD of 0 and classifying the mass as Very Poor. According to the RMR, the mass was classified as poor (class IV) and in the Q classification system as Extremely Poor according. From the parameters Ja and Jr of the Q index, it was also possible to estimate the friction angle for the five families of discontinuities. For the GSI classification, a range varying from 20 to 35 was obtained. The comparison between the results of the different geomechanical classifications applied demonstrated consistency between the methods used.