Abstract
The development of constitutive models for partially saturated soils and the implementation into FE-programs are ongoing research topics. The latter requires selection of a suitable stress update algorithm. In addition to accuracy, robustness and efficiency of the employed stress update algorithm play a decisive role especially for large-scale FE-analyses. This is the motivation for comparing different stress update algorithms of constitutive models for partially saturated soils. The comparison is performed on the basis of the Barcelona Basic Model (BBM), which is currently probably the most well-known constitutive model for partially saturated soils. It is formulated in terms of two independent stress parameters, consisting of net stress and matric suction.
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