"Estudo do comportamento de um solo residual de gnaisse não saturado para avaliar a influência da infiltração na estabilidade de taludes" / "Study of the behavior of a residual unsatured soil for evaluated of the influence infiltration in the slope stability"

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Landslides in tropical soils are often the result of advance of the wetting due to rainfall. This advance results from an increase in pore water pressure, reduction in present soil matric suction, reduction in the shear strength of the soil. This work will present a study related to the shear strength of unsaturated soils, including an experimental study, involving characterization, shear strength tests and obtaining hydraulic characteristics of the soils. There is also a numeric study with the aim to analyze the pore water pressure behavior in slopes and its influence in the slope stability. The shear strength tests were carried out in the direct shear test device, for the flooded condition, and concerning the unconfined compression with direct measured matric suction using a high capacity tensiometer (HCT) placed at the base of the sample, for the unsaturated condition. The permeability tests were carried out with TRIFLEX 2 device, and the retention curves were determined using suction plate, HCT and filtered paper. The experimental data permitted the evaluation of the influence of the characteristics of the rainfall (duration and intensity), initial conditions of the slope and of the hydraulic characteristics of the soils in the pore-pressure change of water in the slope, during the test time. In parallel to the pore pressure change of water, the variations of the safety factors during and after the rainfall were obtained.

ASSUNTO(S)

unsaturated soil strength of soils solo não saturado slope stability resistência dos solos estabilidade de taludes

ACESSO AO ARTIGO

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