Results of unsaturated tests on metastable soils (original) (raw)

2013

Abstract

The main objective of the current research is to analyze through the use of elemental simulations, unsaturated tests executed on soils with metastable characteristics (Brasilia porous clay), which due to high porosity and kind of cementation, presents a structure temporally unstable when undergoing an increasing of wetting and/or variation of the stress state, resulting in the most of cases in a significant change of volume denominated collapse. The tests were done in the Geotechnical Lab from the University of Brasilia and Geological Institute from Charles University in Prague, considering characterization tests for the identification of the basic properties, tests for determination of the characteristic curve, consolidation, direct shear and triaxial, in both conditions saturated and unsaturated, as well as the porosimetry test, for the study of the mechanical behavior. The tests were reproduced using numerical modeling to elemental level, involving a hypoplastic model for the unsaturated soils behavior.

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