Shear strength of an unsaturated soil with direct measurement of suction / Resistência ao cisalhamento de um solo não saturado com medida direta de sucção

AUTOR(ES)

Osvaldo de Freitas Neto

DATA DE PUBLICAÇÃO

2008

RESUMO

The purpose this study was to measure the suction with high capacity tensiometer (HCT), placed at the bottom of the sample, during shear strength tests on a compacted soil. Three kinds of shear strength tests were performed on the sample in different conditions of saturation: triaxial consolidated drained in saturated condition, triaxial consolidated undrained with constant water content and unconfined compression in unsaturated condition. To assess the development of the suction and its influence on the shear strength of a compacted soil, the unconfined compression tests were performed in a series of repeatability and the others with variation of the dry density and water content of the sample. In all unconfined compression tests, the HCT recorded increase of suction until 3% axial deformation, approximately, from where the suction tended to stabilized. The values of compressive strength and suction increased with higher dry densities and lower water contents. Firstly, the shear strength was correlated with suction and the dry density, for constant water content tests. In sequence, it was correlated with suction and the water content for constant dry density tests. The fib angle, that relates the increase of the strength with suction, varied depending of determination method. Its values were higher when directly determined from the undrained strength than when determined from the model presented by Fredlund et al. (1978).

ASSUNTO(S)

tensiômetro de alta capacidade shear strength solos não saturados suction unsaturated soils sucção resistência ao cisalhamento high capacity tensiometer

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