Influência da sucção na perda de massa de um solo arenoso laterítico submetido ao efeito de ondas

• Autor(a) principal: Castro, Marcus Divino de
• Data de Publicação: 2020
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/10972
• topic: Erodibilidade; Latossolo; Canal hidráulico; Sucção; Suction; Erodibility; Latosol; Wave flume; ENGENHARIAS::ENGENHARIA CIVIL::ESTRUTURAS

Among the causes of silting up in large reservoirs, the sediments deposition at bottom them, resulting from the erosion on its margins, is one those causes the decrease the useful volume these water bodies. Recent studies indicate that soil erodibility is significantly affected by its initial suction, with relative differences between initially saturated and relatively dry soil in order of 300%. Given the above, this study aims to evaluate the sandy lateritic soil mass loss of reservoir’s edge Itumbiara hydroelectric power plant, located on Paranaíba River, on border the states of Goiás and Minas Gerais, Brazil, due the waves impact, considering the suction influence. To simulate the phenomenon in question, erodibility tests were carried out on undeformed and deformed specimen the referred soil, statically compacted in differents water contents, subjecting its to the waves impact generated in a wave flume, at a pre-established frequency and inclination, which were 0.56 Hz and 30°, respectively, thus triggering hydraulic erosion on the exposed soil surface. The water contents used in the specimens moulding were defined from the samples soil-water characteristic curves, obtained through the following equipments: tempe cell, pressure plate and WP4. Mass losses from hidraulic erosion were determined after the tests and along the distance of wave flume, including the sediments granulometry determination. The soil mass loss results were compared with the initial specimens suctions, indicating an increase in soil erodibility rates with the growth of initial suction, while that the sediment distribution along the wave flume followed the general trend of sediment deposition observed in water reservoirs.