Abstract
Mountain regions are characterized by high instability and geodynamic processes which result in a wide variety of mass movement, rockfalls and debris flow or avalanches. Mass movement constitutes one of the major hazard in the Rio do Sul city, northeast Santa Catarina state, Brazil. This work investigates the relationship between lithology, tectonic structures, geotechnical properties and landslides processes in the study area. Results showed that lithological control is expressed in alteration grade of different rocks and materials, which is evident by the higher susceptibility of shales and colluvial deposits to weathering, as well as in clay content, which it is primarily represented by illite in the stratigraphic units. Structural control is marked by two failures and fractures sets that affect all stratigraphic units, with NE–SW as the major strike and NW–SE as the subordinate one. Colluvial deposits present in the study area are the result of landslides processes. Geotechnical properties and shear resistance parameters showed a good correspondence between granulometric texture, which is related with mineral composition of parent rock as well as with weathering and erosion processes. Therefore, it is possible to assume that landsliding in the Rio do Sul city can be explained and predicted by the nature of the geological framework and geotechnical behavior of the rocky masses and soil.
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Noveletto, V., Nascimento, M.S., Espíndola, M.S., Müller, V.S. (2019). Litho-Structural Control on the Geotechnical Properties of Colluvial Deposits, Rio do Sul City, Santa Catarina, Brazil. In: Shakoor, A., Cato, K. (eds) IAEG/AEG Annual Meeting Proceedings, San Francisco, California, 2018 - Volume 2. Springer, Cham. https://doi.org/10.1007/978-3-319-93127-2_9
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