Análise do comportamento de taludes de calhas fluviais submetidos a variações rápidas do nível de água do rio: caso do rio Madeira, Porto Velho-RO

Abstract

This work searches analyze the factors that led to the instability a fluvial slope on the right bank of the Madeira river, located approximately 24km downstream of the municipality of Porto Velho, capital of the Rondônia state. The Madeira river presents large variations of water level between the periods of floods and of ebbing for one year due to rainfall regime characteristic of the Amazon region. The slope was instrumented with inclinometers, water level gauge and piezometers and laboratory tests were performed on undisturbed soil samples. Percolation and stability analyzes performed in the SEEP / W and SLOPE / W programs together with the instrumentation data and test results allowed to evaluate the slope behavior in relation to water level variation. A rapid drawdown effect can be observed as one of the triggering factors of slope movement.