Uma proposta para obtenção experimental dos parâmetros do modelo básico de Barcelona para solos não saturados

Abstract

In the last decades, there has been a significant advance in experimental investigations in unsaturated soils, mainly due to the development of laboratory techniques that allow a reproduction of the unsaturated condition observed in the field, making it possible to carry out tests with control and measurement of suction. These techniques made it possible to obtain several constitutive models for unsaturated soils, such as the Barcelona Basic Model (BBM), which uses the concepts of plasticity and critical states. However, normally, the practical application of the laboratory and the consequent obtaining of the constitutive models parameters require sophisticated equipments, often unavailable in soil mechanics laboratories. In this context, the study presented in this article aims to propose a methodology for obtaining the BBM model parameters by performing simplified laboratory tests, without the control of suction. The parameters estimated through this methodology were validated in a numerical simulation performed by using the CODE_BRIGHT software which is based on the finite element method. In general, the behavior of the simulated soil presented a good fit with the experimental behavior, indicating that the idealized methodology presents satisfactory results.