caa a22 4500 605453934 CHVBK 20210128100204.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10064-014-0613-9 doi (NATIONALLICENCE)springer-10.1007/s10064-014-0613-9 Piezometric variations in the basaltic massif beneath the Itaipu hydroelectric plant (Brazil/Paraguay border): Right Buttress Dam [Elektronische Daten] [Josiele Patias, Lázaro Zuquette, José Rodrigues-Carvalho] This article describes a case study of the changes in the hydrogeotechnical behavior of a portion of the foundation block of the Itaipu Dam, which is located on the Parana River on the border between Brazil and Paraguay. The study focuses on the foundation buttress blocks of the Right Buttress Dam, where the most permeable regions of the massif are monitored by standpipe piezometers. The behaviors of two features within the basalt layers, a basaltic breccia and a fracture, were evaluated. In general, the uplift pressure distribution models of the foundations of concrete dams only consider the hydraulic loads caused by the presence of the reservoir and the tailwater elevation. However, this study demonstrates that the hydrogeotechnical behavior of the massif in a given period may also depend on the local variation in rainfall. The primary conclusion is that although the rocky massif has received several foundation treatments (waterproofing and drainage work), the natural hydraulic conditions of the massif govern the pressure variations within the monitored features. Studying the behavior of these features is of fundamental importance to all large concrete dams, as a statistical analysis of ruptures in several types of dams conducted by the International Commission on Large Dams has demonstrated that accidents involving this type of dam are primarily caused by foundation collapse, particularly by collapses related to internal erosion problems and low shear resistance. Springer-Verlag Berlin Heidelberg, 2014 Basalt nationallicence Core boring nationallicence Piezometer level nationallicence Hydrogeology nationallicence Itaipu Dam nationallicence Rainfall regime nationallicence Patias Josiele Itaipu Binacional, Rua das Missões, No 859, Ap.: 12, Bloco: 01. Centro, 85851-240, Foz do Iguaçu, PR, Brazil aut Zuquette Lázaro Departamento de Geotecnia, Universidade de São Paulo - USP, Avenida Trabalhador São Carlense, No 400, 13566-590, São Carlos, SP, Brazil aut Rodrigues-Carvalho José Departamento de Ciências da Terra, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa - UNL, 2829-516, Caparica, Portugal aut Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/1(2015-02-01), 207-231 1435-9529 74:1<207 2015 74 10064 https://doi.org/10.1007/s10064-014-0613-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10064-014-0613-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Patias Josiele Itaipu Binacional, Rua das Missões, No 859, Ap.: 12, Bloco: 01. Centro, 85851-240, Foz do Iguaçu, PR, Brazil aut NATIONALLICENCE 700 1- Zuquette Lázaro Departamento de Geotecnia, Universidade de São Paulo - USP, Avenida Trabalhador São Carlense, No 400, 13566-590, São Carlos, SP, Brazil aut NATIONALLICENCE 700 1- Rodrigues-Carvalho José Departamento de Ciências da Terra, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa - UNL, 2829-516, Caparica, Portugal aut NATIONALLICENCE 773 0- Bulletin of Engineering Geology and the Environment Springer Berlin Heidelberg 74/1(2015-02-01), 207-231 1435-9529 74:1<207 2015 74 10064