Hyperbolic and Asaoka's methods, other uses. Case of water content equilibrium of unsaturated soils. Theory.
DOI:
https://doi.org/10.24849/j.geot.2019.145.02Keywords:
Prediction, unsaturated soils, equilibrium water contentAbstract
This paper shows the potential applications of the hyperbolic and Asaoka’s method for prediction in geotechnical problems. One application refers to the prediction of the equilibrium water content when a number of this parameter have been previously measured over the slow process of along the height of the soil sample whose base is subjected to a certain suction. It is shown that this phenomenon is governed by an equation just as the consolidation equation (classical scope of both methods). Strictly speaking, both phenomena hold the equation of diffusion and that in the case of an unsaturated flow, the coefficient of consolidation is not the key physical parameter, but the hydraulic diffusivity, D(), that need not be constant. The previous example, with which the usefulness of the aforementioned methods are proven in a subsequent paper, helps to highlight their suitability for any other phenomena of diffusion, such as thermal problems and transport of contaminants, as well as for those laboratory or field tests that tend to asymptotic values (pile load or pressiometer tests, for instance). Thus, this paper insightfully addresses the principles of the hyperbolic and Asaoka’s method and points out those geotechnical problems in which they have been successfully applied. Both predictive methods are ultimately meant to extraordinarily save time of testing, and most importantly, to reduce the failure likelihood of an extended test.
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