Barragens: construção da barragem de CCR da PCH Quebra Dentes – Quevedos - RS

Abstract

The use of dams for the purpose of storing water for various purposes, is an ancient practice, with records in the oldest civilizations of mankind. Today, the main uses of the dams are to irrigation, supplying large populations, reject materials and generate electricity. In relation to the technical part, there are several methods for building these dams, all of which are defined based on several aspects, such as geology and geotechnics of the dam site. The main aspects that define the type of dam are the materials available in the region and the foundation on which the dam will be seated. In Brazil, the most used dams are homogeneous earth and zoned, and in the last decades gravity buses executed with Roller Compacted Concrete RCC have shown a significant growth. The RCC consists of a type of executive method of a concrete with low trace cement, capable of achieving good strength levels. In general, CCR is used for paving and gravity dams.The dam of the PCH Quebra Dentes, which will serve as the basis of this study, is of the spillway type, and was executed in the RCC concrete method. All rock material used in the concrete was used from the excavations of the PCH tunnel and crushed at the own construction. The dam will have a height of 22,62 meters, and its stability was verified and the results obtained showed the safety of the structure.