Título: | INTERNAL EROSION INITIATION PROCESSES IN HOMOGENEOUS EARTHFILL DAMS: A CASE STUDY | ||||||||||||
Autor: |
CONRADO OLIVEIRA C DE CARVALHO |
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Colaborador(es): |
TACIO MAURO PEREIRA DE CAMPOS - Orientador |
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Catalogação: | 04/JUN/2024 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=66921&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=66921&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.66921 | ||||||||||||
Resumo: | |||||||||||||
In a homogeneous earthfill dam responsible for the water supply of a private
company, an initial process of internal erosion was observed near the base of the
downstream slope, which is listed as one of the main dam failures causes in the
world. Although this problem has been correctly solved at the studied structure, this
thesis aimed to find the causes for the detected anomaly in order to increase
knowledge about this subject. To do so, the history of the structure was investigated,
undisturbed samples were collected near the region of interest to carry out
laboratory tests to characterize the soil, determine the physical parameters, measure
permeability coefficients under different effective stresses and find its characteristic
curve (SWCC) through filter paper tests. With the results of the tests, computational
models were elaborated under different scenarios to investigate the behavior of
hydraulic gradients. The software Plaxis LE was used in this work. It was evaluated
whether the adoption of unsaturated parameters or 3D analysis would promote any
change in the flow pattern in the studied structure, which did not occur. It was also
considered whether the soil-atmosphere interaction could generate critical
hydraulic gradients through rainfall and evaporation cycles, but there were no
critical results either. Although, permeability seems to have a an inversely
proportional relationship with hydraulic gradient. Thus, it is understood that the
formation of organic soils at the toe of the downstream slope may have led to the
observed internal erosion process.
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