1. A model for one-dimensional consolidation of clayey soils with non-linear viscosity.
- Author
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Oliveira, Fernando S., Martins, Ian S.M., and Guimarães, Leonardo J.N.
- Subjects
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SOIL consolidation , *VISCOSITY , *FINITE difference method , *WATERLOGGING (Soils) , *SOIL creep , *EMBANKMENTS , *CLAY soils - Abstract
A model for the one-dimensional consolidation of saturated clayey soils, considering creep, is proposed, based on the consolidation mechanism idealized by Terzaghi (1941). The effective vertical stress is divided into two parts: one corresponding to the "solid" contacts, and other relating to the "viscous" contacts, the void ratio changes being caused by variations solely in the solid portion. Based on experimental evidence, a non-linear viscosity law was adopted, described by a hyperbolic function, in addition to its dependence on the void ratio. The resulting differential equation system is solved through the Finite Difference Method. The main "secondary effects of time" – experimental deviations from the classical Terzaghi (1925) theory – were able to be reproduced using the model, as well as experimental results that support other categories of consolidation models, such as the isotache- and C α / C C -based models. A good fit was obtained for the results of long-term laboratory tests in clays from different parts of the world that reached the end of secondary consolidation. A good prediction was also reached for the evolution of settlements from the experimental embankment on the soft soils of Lilla Mellosa, monitored since 1947 in Sweden. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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