Avaliação da influência do sistema de drenagem inclinado durante o regime operacional transiente de uma barragem de terra

• Autor(a) principal: Petrocelli, Patrick de Sousa
• Data de Publicação: 2019
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/52095
• topic: Barragem; Estabilidade de talude; Filtro inclinado

According to Cruz (2004), dams are structures intended for the retention and accumulation of water, and the art of build a dam is linked to the ability of control the flow through the dam and foundation. Silva (2016) also reports that if the flow control through a embankment does not occur correctly, this may imply the saturation of the compacted landfill, allowing the massif to be subjected to high poropression values, and may also reduce the soil resistence against shear and cause the structure rupture. Given the importance of internal drainage, several filter solutions have been proposed, such as the vertical filter (chimney) proposed by Terzaghi or even the mixed inclined drain solution proposed by Mello (1975), which presents improvements in dams with permeable foundations and greater efficiency at dissipating poropressions during the emptying. Although the inclined filter type has higher efficiency compared to the vertical filter, those are not commonly implemented by designers, probably because this type of project be more difficult of implementing. In this way, the present work sought to investigate the safety and flow conditions of an inclined filter earth dam using the Aracoiaba Dam as a case study. For this, was obtained from COGERH the instrumentation data of the dam under study for the generation of a numerical model, using the software GeoStudio 2019. In this stage of modeling, in order to obtain a responsive numerical model in comparison to the instrumented model, firstly the calibration process was performed by modifying various geotechnical parameters of the dam and its foundation. By obtaining a calibrated numerical model, a study of the variation of drainage system alternatives was made, evaluating the dam behavior for several design proposals for the internal filter. The obtained results showed that the alteration of the drainage system did not significantly influence the flow through the foundation in relation to the vertical filter. Regarding the stability of the downstream slope, it was observed that the inclined filter alternatives showed reductions in the safety coefficients of the dam.