Comportamento mecânico de misturas de areia e finos de um sedimento pós-barreiras da cidade de Natal/RN
In most engineering problems, soil is composed of different proportions of coarse and fine particles whose mechanical behavior is different from that observed for pure sand or clay. This study aims to determine both compressibility and strength of mixtures composed by sand and fines from a Post-B...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27278 |
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| Resumo: | In most engineering problems, soil is composed of different proportions of
coarse and fine particles whose mechanical behavior is different from that observed
for pure sand or clay. This study aims to determine both compressibility and strength
of mixtures composed by sand and fines from a Post-Barreiras sediment collected in
Natal, Rio Grande do Norte State. Sand-fines mixtures with varying fines contents of
0, 30, 50, 75 and 100% were prepared. The mechanical characterization was
performed by means of edometric compression and direct shear tests. It was observed
that the compressibility parameters vary with fines content and depend on the applied
stress and sample initial conditions. The transition fines content determined by
edometric tests varies between 10% and 30%. It was possible to determine a single
Intrinsic Compression Line (ICL) for the materials studied. Direct shear tests resulted
in friction angles ranging from 30° to 38°. The addition of 30% of fines increased the
shear strength when compared to the strength of the sand in the loosest state. For
higher fine contents, the value of the maximum shear stress decreases to a value close
to that presented by the fines matrix. |
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