Abstract
In this chapter, the elastoplastic framework for the volumetric behavior of
soils developed in Chapters 8 and 9 is extended to account for the case of expansive
soils. The hydraulic behavior of the soil is simulated using the porous-solid model
developed in Chapter 4. The result is an elastoplastic framework where the value and
sign of the expansion index depend on the density of the soil as well as the state of
stresses and the direction of the increment of the effective stress with respect to the
yield surfaces in the plane of effective mean stress against suction. Experimental and
numerical comparisons show the ability of the model to simulate the behavior of
expansive soils under different stress paths.
Keywords: Expansive soils, Effective stresses, Elastoplasticity, Compression index, Unloading-reloading index, Compression-expansion index, Relative density, Collapse upon loading, Loading collapse yield Surface, Suction increase yield surface, Wetting path, Drying path, Loading path, Unloading path.
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