Thesis (M.S.)--University of Wisconsin--Madison, 1967. / Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

The influence of an impermeable clay core on the static and dynamic behaviour of an earth dam is investigated. The cores used are of two types, central core and upstream sloping core. Recommendations are made on the suitability of each type of core for dams in areas subject, to seismic activity. The finite element method of analysis is used and the material is assumed to behave in a viscoelastic manner. The sloping core dam is found to be less desirable than the central core dam for earthquake regions because of the unfavourable stress distributions in the upper part of the dam. Static tensile stresses develop in this region, which do not occur in the central core dam, and the extent of these stresses is increased when the dynamic stresses due to the earthquake are superimposed. The accelerations, which increase with elevation in the dam, indicating the necessity of using a variable seismic coefficient, are higher in the sloping core dam than in the central core dam. It is found that the first mode, the only mode that approximates a shear mode, contributes the major share to the dynamic response of the dam. The finite element method is shown to be sensitive to irregularities in the subdivision of the dam into finite elements. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

Nowadays, especially after the appearance of the global warming effects, water is becoming less and less available. Here appears the role of water resources engineering. That is; finding the mean through which we can collect water. One alternative for doing so is the storing of water behind dams. This is why this report will focus on damsâ issues. This report is divided in two sections. The first section deals with the most common types of dams, the forces applied on them, the modes of failure of these structures, the environmental effects on the stream, the decommissioning and other technical matters. The second part focuses on the different methods used in order to estimate or predict the breach of the dams especially for the embankment type. These methods are applied to the case of the Timberlake Dam in Lynchburg, VA that failed in 1995 and was rebuilt in 2000. / Master of Science

Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1938. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed April 20, 2010) Includes bibliographical references (p. 2-4) and index (p. 116-119).

Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1939. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed April 27, 2010) Includes bibliographical references (p. 60).

No description available.

Thesis (Master)--İzmir Institute of Technology, İzmir, 2006. / Keywords: Dams, earthfill dams, artificial neural networks, modelling. Includes bibliographical references (leaves. 73-75).

The ability of a filter to stop erosion through cracks in the core of a embankment dam requires that the filter be graded so that it will restrain movement of particles from the core, and that the filter be truly cohesionless, so that it will not crack even when subjected to the same types of deformations that cause cracks in the core. To achieve resistance to cracking, most current filter criteria require that the filter should contain no more than 5% of material finer than the #200 sieve, and that this fine material should be non-plastic. This research study was conducted to investigate whether there specifications do, in fact, result in filters that can be relied upon to slump, fill cracks, and prevent interval erosion in embankment dams. The research study involved filter erosion tests using a 4-inch diameter device and a 12-inch square device, and "sand castle" tests to investigate the tendency for candidate filters to slump when immersed in water. These tests showed that conventional filter criteria  no more than 5% fines, and fines that are non-plastic, are conservative. The research study showed that even filters with 5% of highly plastic fines are able to slump, fill cracks, and prevent erosion. / Ph. D.

Barragens são estruturas geralmente construídas transversalmente a um rio, tendo como objetivos, a geração de energia elétrica, a captação de água para abastecimento público, o controle de cheias e a navegação. Para atender a estes objetivos, as barragens elevam o nível dágua à montante de seu eixo e, em algumas obras, acumulam um significativo volume hídrico para garantir a regularização do corpo dágua afetado. Devido às grandes dimensões envolvidas, dos impactos provocados e dos investimentos necessários, as barragens devem ser sempre seguras, pois acidentes a ela relacionados, geralmente ligados a liberação dos volumes de água acumulados, afetam fortemente o meio ambiente e a sociedade em geral, incluindo vidas humanas. Desta forma, ferramentas que permitam a previsão destes impactos, e a subseqüente organização de planos de ações preventivas e emergenciais, fazem parte das rotinas de projeto, construção e operação destes empreendimentos. Neste trabalho apresenta-se um estudo metodológico, aplicado à Barragem Guarapiranga, voltado para a gestão de emergências ocasionadas por rupturas de barragens, visando o estabelecimento de rotinas para a avaliação dos impactos, através de ferramentas capazes de simular o efluente de um acidente hidrológico ou estrutural, seu desenvolvimento na forma de uma onda de cheia que se propaga pelo vale a jusante e finalmente, a proposição de uma seqüência de atividades relacionadas a interpretação dos resultados das simulações, que permitam a formação dos planos de ações preventivas e emergenciais. / Dams are structures usually built across a river with goals of, generation of electricity, public water supply, flood control and navigation. In order to achieve these goals, dams promote the raise of water level upstream of its axis and, in some cases, it accumulates a significant volume of water to ensure the regularization of the affected water mass. Due to their large dimensions, in associated impacts and the necessary investments, dams must be safe because accidents usually release big amount reserved water and strongly affect the environment and the society, including human lives. Thus, tools that are able to predict such impacts and then, construct plans for the preventive and emergency actions, must be part of the routine of design, built and operation of those dams. This work presents a methodological study, applied in Guarapiranga Dam, for management of emergencies caused by dam-breaks, with the purpose of establishing routines to evaluate the impacts, by using tools that are able to simulate the discharges related to a hydrologic or structural failure, and its wave propagation through the downstream. Finally this work proposes a sequence of activities related to the interpretation of the simulation results that allow the construction of plans for preventive and emergency plans.

Barragens são estruturas geralmente construídas transversalmente a um rio, tendo como objetivos, a geração de energia elétrica, a captação de água para abastecimento público, o controle de cheias e a navegação. Para atender a estes objetivos, as barragens elevam o nível dágua à montante de seu eixo e, em algumas obras, acumulam um significativo volume hídrico para garantir a regularização do corpo dágua afetado. Devido às grandes dimensões envolvidas, dos impactos provocados e dos investimentos necessários, as barragens devem ser sempre seguras, pois acidentes a ela relacionados, geralmente ligados a liberação dos volumes de água acumulados, afetam fortemente o meio ambiente e a sociedade em geral, incluindo vidas humanas. Desta forma, ferramentas que permitam a previsão destes impactos, e a subseqüente organização de planos de ações preventivas e emergenciais, fazem parte das rotinas de projeto, construção e operação destes empreendimentos. Neste trabalho apresenta-se um estudo metodológico, aplicado à Barragem Guarapiranga, voltado para a gestão de emergências ocasionadas por rupturas de barragens, visando o estabelecimento de rotinas para a avaliação dos impactos, através de ferramentas capazes de simular o efluente de um acidente hidrológico ou estrutural, seu desenvolvimento na forma de uma onda de cheia que se propaga pelo vale a jusante e finalmente, a proposição de uma seqüência de atividades relacionadas a interpretação dos resultados das simulações, que permitam a formação dos planos de ações preventivas e emergenciais. / Dams are structures usually built across a river with goals of, generation of electricity, public water supply, flood control and navigation. In order to achieve these goals, dams promote the raise of water level upstream of its axis and, in some cases, it accumulates a significant volume of water to ensure the regularization of the affected water mass. Due to their large dimensions, in associated impacts and the necessary investments, dams must be safe because accidents usually release big amount reserved water and strongly affect the environment and the society, including human lives. Thus, tools that are able to predict such impacts and then, construct plans for the preventive and emergency actions, must be part of the routine of design, built and operation of those dams. This work presents a methodological study, applied in Guarapiranga Dam, for management of emergencies caused by dam-breaks, with the purpose of establishing routines to evaluate the impacts, by using tools that are able to simulate the discharges related to a hydrologic or structural failure, and its wave propagation through the downstream. Finally this work proposes a sequence of activities related to the interpretation of the simulation results that allow the construction of plans for preventive and emergency plans.