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Abstract(s)
Este trabalho tem como objetivo demonstrar a importância das investigações geológicas, geotécnicas e geomecânicas em taludes rochosos, mais concretamente na escarpa rochosa de S. Cristóvão (Cinfães, NW de Portugal), adjacente a uma via de comunicação. Na primeira parte do estudo, realizou‐se a caracterização da área em questão, a nível cartográfico, geológico, geomorfológico e hidrológico, numa segunda parte, procedeu‐se a estudos de geotecnia e geomecânica de taludes. Com recurso à técnica de amostragem linear recolheu‐se toda a informação geológica, geotécnica e geomecânica da escarpa e, para além disso, avaliou‐se o índice de resistência à compressão uniaxial do material‐rocha e das superfícies das descontinuidades. Posteriormente foi compilada e cruzada toda a informação para o estudo da compartimentação do maciço rochoso e estabelecimento de uma cartografia de zonamento eotécnico. Na classificação do maciço rochoso, em termos de qualidade, recorreu‐se às classificações geomecânicas aplicadas a taludes (e.g., RMR, SMR, GSI). A classificação SMR permitiu avaliar a estabilidade da escarpa e os potenciais mecanismos de rotura juntamente com a avaliação geológico estrutural através do teste de Markland. De forma a avaliar a suscetibilidade e o nível de perigosidade da escarpa aplicou‐se o sistema RHRSm2 e o índice de qualidade de taludes (SQI). De forma expedita, aplicando programas numéricos (Swedge e Rocfall da RocScience), realizou‐se a modelação das possíveis cunhas e as respetivas potenciais trajetórias. Por último é apresentada a solução de reforço e de proteção proposta, bem como a comparação com a solução recentemente implementada.
This work aims to demonstrate the importance of geological, geotechnical and geomechanical investigations in rock slopes, more specially in the rocky scarp of S. Cristóvão (Cinfães, NW Portugal), adjacent to a roadway. In the first part of the study, the characterization of the site was carried out, at the cartographic, geological, geomorphological and hydrological level, in a second part, slope geotechnical and geomechanical studies were carried out. Using the scanline sampling technique, geological, geotechnical and geomechanical information of the scarp was collected and, in addition, the uniaxial compressive strength index of the rock material and the discontinuity surfaces were evaluated. Afterwards, all information was compiled and cross‐checked for the study of the block size of the rock mass and the establishment of a geotechnical zoning map. The classification of the rock mass in terms of quality was based on the geomechanical classifications applied to slopes (e.g., RMR, SMR, GSI). The SMR classification permitted to evaluate the stability of the scarp and the potential mechanisms of rupture together with the structural geological evaluation through the Markland test. In order to evaluate the susceptibility and the level of danger of the slope, the RHRSm2 system and slope quality index (SQI) were applied. In a prompt approach was applied numerical programs (Swedge and Rocfall from RocScience) to the modelling of possible wedges and their potential trajectories. Finally, is presented the reinforcement and protection solution designed, as well as the comparison with the recently implemented solution.
This work aims to demonstrate the importance of geological, geotechnical and geomechanical investigations in rock slopes, more specially in the rocky scarp of S. Cristóvão (Cinfães, NW Portugal), adjacent to a roadway. In the first part of the study, the characterization of the site was carried out, at the cartographic, geological, geomorphological and hydrological level, in a second part, slope geotechnical and geomechanical studies were carried out. Using the scanline sampling technique, geological, geotechnical and geomechanical information of the scarp was collected and, in addition, the uniaxial compressive strength index of the rock material and the discontinuity surfaces were evaluated. Afterwards, all information was compiled and cross‐checked for the study of the block size of the rock mass and the establishment of a geotechnical zoning map. The classification of the rock mass in terms of quality was based on the geomechanical classifications applied to slopes (e.g., RMR, SMR, GSI). The SMR classification permitted to evaluate the stability of the scarp and the potential mechanisms of rupture together with the structural geological evaluation through the Markland test. In order to evaluate the susceptibility and the level of danger of the slope, the RHRSm2 system and slope quality index (SQI) were applied. In a prompt approach was applied numerical programs (Swedge and Rocfall from RocScience) to the modelling of possible wedges and their potential trajectories. Finally, is presented the reinforcement and protection solution designed, as well as the comparison with the recently implemented solution.
Description
Keywords
Maciços rochosos Geomecânica Geotecnia de taludes Queda de blocos Modelação geotécnica Cinfães Rock Masses Geomechanics Slope geotechnics Rock fall Geotechnics modelling