Abstract
Alonso et al. (1990) proposed the first elasto-plastic model for unsaturated soils, which was subsequently called the Barcelona Basic Model (BBM). The BBM successfully explained many features of unsaturated soils and received extensive acceptance. At present, the BBM remains one of the fundamental elasto-plastic models for unsaturated soils. The original BBM was proposed in terms of an incremental formulation. Though the incremental formulation is useful for programming in the constitutive modeling, it is complicated for understanding soil behavior. This paper derives an analytical formulation of the BBM. Its significances in the constitutive modeling of unsaturated soils are also discussed.
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