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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Safety of Dams: A Pathological Approach of Qualitative and Quantitative Risks
Author(s)
Flavio Augusto Settimi Sohler1, 2 and Laura Maria Mello Saraiva Caldeira3
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DOI:10.17265/1934-7359/2016.09.007
Affiliation(s)
1. National Civil Engineering Laboratory—LNEC, Eletroras Furnas, Aparecida de Goiânia 74923-650, Brazil
2. National Council of Scientific Research—CNPq, Brasilia 71605-001, Brazil
3. National Civil Engineering Laboratory—LNEC, Geotechnics Department, Lisbon, 1700-066, Portugal
ABSTRACT
Dams are critical and
essential elements in any infrastructure and, in front of accidents occurred in many countries, it is extremely
important to know the risk of these structures. Inserted in this context, it
was found in the technical literature, methods and tools capable of measuring
the exposure value by means of indicators. In the study, the highlights were 12
methods of qualitative, semiquantitative and quantitative risk analysis,
representing an overview of risk analysis methods available in the literature
with potential use in dams, that it has been done into electronic spreadsheets.
The case study is performed on a sample of concrete dam and earth/rockfill
built and operated by Eletrobrás Furnas Company, supported by documentary
research, projects, field inspections and interviews with experts. After
applying the methods and the analysis thereof, has been prepared the Eletrobras
Furnas dam risk analysis method which is characterized by adapting the criteria
analyzed to the reality of the company’s dams and it was also performed the portfolio risk
analysis of 18 dams. In spite of the variety and subjectivity of qualitative
and semiquantitative methods, the results show that they tend to converge on
the analysis of dam based on risk. The application methodology demonstrates the
feasibility assessment stage, covering the preliminary analysis for portfolio
dams, followed by formal and individual risk analyzes for the most critical
structures. These results confirm the applicability of risk analysis
techniques, contributing to the consolidation of this tool as fundamental in
the dam safety.
KEYWORDS
Dam safety, dams breaks, methods and tools for risk analysis, risk analysis in dam portfolio.
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