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Erschienen in:
2005 | OriginalPaper | Buchkapitel
The influence of hydraulic hysteresis on unsaturated soils FE analyses
verfasst von : Roberto Tamagnini
Erschienen in: Unsaturated Soils: Numerical and Theoretical Approaches
Verlag: Springer Berlin Heidelberg
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Unsaturated soils are characterized by hydraulic hysteresis. Hysteresis can be recorded during cycles of wetting and drying. This feature isn’t accounted for in most of the classical constitutive models. In this paper, an extended Cam-clay model for unsaturated soils is applied in the Finite Element (FE) analysis of an ideal geotechnical problem. The extended Cam-clay can be coupled both with an hysteretic equation of the water retention curve (WRC) and with an “elastic” equation (i.e. the main drying curve the main wetting curve coincide). These two constitutive frameworks are adopted to model the construction stages and the impounding of an ideal dike. The differences produced by hydraulic hysteresis in the distribution of pore water pressure, displacement and stress fields are discussed.