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  Geological and Geotechnical Aspects of Line 4S RJ - Stretch Morro do Cantagalo-Gávea

  The present paper introduces the main geological and geotechnical aspects of Line 4: Stretch South from Rio de Janeiro Metro system. Crossing several geological scenarios, from very good rock to soils formed in transitional environment, the stretch will be excavated with Tunneling Boring Machine (TBM) with a diameter greater than 10 meters. Having as main reference more than 250 boreholes, the present paper discusses and introduces the main aspects from geological units, as well as geological geotechnical cross sections developed to the detailed design. From the different materials that will be excavated by the TBM, the two types of gneisses (Augen and Kinzigitic) and the compact to very compact sand are the most representative.

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