INFLUÊNCIA DA SUCÇÃO NA RESISTÊNCIA AO CISALHAMENTO DE UM SOLO RESIDUAL DE FILITO DE BELO HORIZONTE, MG / INFLUENCE OF SUCTION ON THE SHEAR STRENGTH OF A FILITE RESIDUAL SOIL FROM BELO HORIZONTE, MG

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This work intends to evaluate the influence of suction in the shear strength of a young residual filite soil from Belo Horizonte city, of Minas Gerais, Brazil. The experimental program included conventional tests of geotechnical, chemical and mineralogical characterization. The relationship between suction and water content of soil was obtained by the filter paper method and represented graphically by soil-water characteristic curves (SWCC). In order to determine the shear strength of unsaturated soil, direct shear tests with controlled suction were executed with soil samples in their natural state. In addition, conventional shear strength tests were performed with undisturbed and submersed specimens. Both types of tests were performed with different values of stress. From the analysis of the tests´ results it was possible to establish a three- dimensional shear strength envelope in function of the stress state variables ((sigma)-ua) and (ua-uw). Moreover, some considerations about the influence of stress variables in compressibility of soil are discussed. Finally, a comparison of the results obtained for the soil´s shear strength was made with different prediction models using the SWCC and the effective strength parameters (i.e. Lytton, 1995; Vanapalli et al., 1996; Fredlund et al., 1996; Oberg e Sallfors, 1997). The results were also compared with other data found in the literature.

ASSUNTO(S)

solo nao saturado residual soil ensaio de cisalhamento unsaturated soil solo residual shear-strength shear test resistencia ao cisalhamento

ACESSO AO ARTIGO

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