ResumoAs barragens de terra são estruturas suscetíveis a percolação de água, podendo sofrer processos de erosão interna, fenômeno no qual as partículas finas do solo são carreadas pelo fluxo da água para o interior da estrutura, podendo levar a uma perda de solo. O estudo desses processos nas barragens localizadas no semiárido do estado do Ceará é importante, tendo em vista a vulnerabilidade maior dessas estruturas devido aos períodos prolongados de seca e aos cenários de enchimento dos reservatórios, contribuindo para o desgaste do solo. A estrutura responsável por reter as partículas do solo e paralisar processos de erosão interna são os filtros granulares, com isso, torna-se necessário o bom dimensionamento das granulometrias dos materiais do filtro. Os critérios de verificação usualmente utilizados, como o critério de Terzaghi, adotado em projetos de barragens analisadas, entretanto, não se adequam a todos os tipos de filtros, uma vez que se restringem a solos pouco graduados. Métodos recentes, que incorporam o dimensionamento dos vazios dos drenos, resultam em uma abordagem mais realista. O presente trabalho analisa o critério por tamanho de vazios de Indraratna e Raut (2008), juntamente com o critério de Terzaghi, realizando simulações acerca desses dois critérios e aplicando-as a Gangorra e Itaúna, duas barragens localizadas no estado do Ceará. Os resultados mostram que a teoria dos vazios na associação com o estado de compactação para descrever o comportamento dos filtros é mais eficiente que os critérios convencionais de Terzaghi, apontando a vulnerabilidade para um dos casos analisados.Palavras-chave: Barragens de terra. Erosão interna. Filtros. AbstractEmbankment are structures susceptible to seepage that can cause internal erosion processes, a phenomenon in which the fine particles of the soil are carried by the flow into the structure, which can lead to soil loss. The study of the processes in the dams located in the semi-arid state of Ceará is important, due to the greater vulnerability of the structures in prolonged periods of drought and reservoir filling scenarios, contributing to soil wear.A structure responsible for retain as soil particles and paralyzing internal erosion processes are the granular filters, which makes it necessary to good design of the granulometry of the filter materials. The selection criteria usually used, such as the Terzaghi criterion, adopted in dams projects analyzed, are not suitable for all types of filters, since they are restricted to low graded soils. Recent methods that incorporate drainage void sizing result in a more realistic approach. The present work analyzes the criterion for the size of the voids of Indraatna and Raut (2008), together with the Terzaghi criterion, where they perform simulations on the two criteria, and apply two dams located in the state of Ceará, Gangorra and Itaúna. The results show that the theory of voids in the association with the state of compression to describe the behavior of the filters are more efficient in the conventional Terza...

The data acquisition process is an important step in capturing information, especially when it comes to historical heritage documentation, these buildings often have complex structures and little collection, which makes the geometric survey process by the traditional way even more di cult. Currently studies have been conducted using 3D terrestrial laser scanner (TLS) as a capture of geometric information in order to generate point clouds and serve as a basis for analysis, including using BIM and facilitate this documentation process. The paper was developed from a theoretical basis on the subject and application, performing a metric evaluation comparing existing point cloud and 2D surveys, in order to generate a database and propose a method to improve dimensional inspections through point clouds in historic buildings, where it was possible to note some differences in shape and measurement between the two surveys. The study was validated on the metal façade of the José de Alencar Theater.