Estimativa de propriedades hidráulicas de solos a partir do ensaio de ascensão capilar / Estimating the hydraulic properties of soils from capillary rise test

AUTOR(ES)

Tania Zapata Coacalla

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

31/08/2012

RESUMO

This study evaluates the potential of capillary rise test and a parameter optimization technique to estimate soil hydraulic parameters. The capillary rise is a simple and expedite test that is conditioned by soil hydraulic properties. In the mathematical representation of the capillary rise we used the model of Terzaghi (1943), who considered that saturated hydraulic conductivity commands the phenomeno and the model of Lu &Likos (2004b) who used the Gardner equation (1958) to represent the hydraulic conductivity function, considering that the flow takes place in a non-saturated condition. The optimization process used the SOLVER routine, component of the EXCEL program, that was firstly tested using experimental data of Lane &Washburn (1946) and Zhang &Fredlund (2009). Then, results of capillary rise of eight samples of typical soils of the State of São Paulo, Brazil, were modeled with the parameters derived from the technique. It was observed that both the Terzaghi (1943) and Lu &Likos (2004b) models were able to reproduce the experimental results of capillarity, although the best results were yielded by the model Lu &Likos (2004b) for most soils. The prediction of saturated hydraulic conductivity, in general, differed less than one order of magnitude of experimentally measured values, although larger discrepancies have been noted for certain types of soils. The resulting Gardner parameter of the hydraulic conductivity function were of the same order of magnitude of the values reported in the literature for similar soils. The results on the application of capillary rise test and optimization technique proved promising for the determination of soil hydraulic parameters analyzed, with the advantage of having a simple and rapid procedure for the purpose described.

ASSUNTO(S)

capillary rise condutividade hidráulica saturada função condutividade hidráulica hydraulic conductivity function optimization otimização saturated hydraulic conductivity ascensão capilar

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