Constitutive modeling of time-dependent stress–strain behaviour of saturated soils exhibiting both creep and swelling

In general, clayey soils exhibit more or less both creep and swelling. In this paper, “creep” means viscous compression under a constant load condition in an oedometer test, while “swelling” means viscous expansion under a constant load condition in an oedometer test and is a reverse behaviour to creep for all saturated soils. Clayey soils containing the clay mineral montmorillonite show strong creep and swelling characteristics. Both creep and swelling characteristics have a significant influence on the deformation and failure of geotechnical structures. This paper presents main data from tests on a mixture of bentonite–silica sand in one-dimensional (1D) straining. Tests include (i) multistaged loading tests with unloading–reloading and enough time for creep and swelling in 1D straining and (ii) step-changed constant rate of strain (CRSN) compression tests with unloading–reloading in 1D straining as well. From the test data, the creep, swelling, and strain rate effects are observed and discussed. Based ...

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