ABSTRACT
An anisotropic constitutive model (BBM) has been implemented in a finite difference-based computer program to simulate the geo-mechanical behavior of unsaturated soils subjected to continuous wetting and drying. In this view, the Barcelona Basic Model (BBM) has been implemented into the finite difference-based computer program to clarify the mechanical behavior of fine-grained partially saturated soils during the wetting process. This numerical modeling was verified based on available data in the literature review. The application of the code was investigated for modeling a slope considering the suction-induced process. The research also determined the effect of the over-consolidation ratio in partially saturated or unsaturated soils, especially stress paths, as a modification to yield relation. In this regard, a soil structure system and its capability for checking the instant and consolidated settlements in different stress paths have been evaluated. Based on the results, finite difference methods with BBM and modified BBM efficiently demonstrate the actual behavior of unsaturated or partially saturated fine grained soils. Moreover, OCR criterion has been added to BBM fundamental relations to improve its application in wetting-Induced processes. In this way, more rational results have been gained by this modification.
