Abstract
This work emphasises the importance of a detailed geomechanical study to a better geotechnical understanding of a weak rock mass. In addition, Geographic Information Systems (GIS) tools for spatial analysis and rock database overlay were applied. The stability of a metasedimentary rock cut slope in Trofa region (NW Portugal, Iberian Peninsula) was studied. The main geomorphological, geological, geotechnical and geomechanical constraints were characterised and integrated along a highly deformed phyllitic rock mass. The scanline sampling technique of discontinuities has been applied to the study of basic geotechnical description of free rock mass surfaces. In order to classify the quality of the phyllitic rock mass, basic Rock Mass Rating (RMR), Slope Mass Rating (SMR) and the Geological Strength Index (GSI) were applied. The structural and geotechnical solution for the stabilisation of the cut slope was outlined. This methodology turned out to be valuable to understand the behaviour of slope stability in weak rock mass and it can be useful to the accurate estimation of future unstable rock slope.
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