Investigação da relação índice de vazios-tensão vertical efetiva na compressão edométrica de uma argila mole da Ilha do Fundão, RJ

Abstract

The Soil Rheology Group of COPPE/UFRJ has been developing a model for plastic soils behavior. This model embraces the cases that are not properly covered by Terzaghi‟s (1936) principle of effective stress: secondary compression, stress relaxation and creep. It is known that viscosity is one of the key factors to those processes. This work investigates whether the void ratio-vertical effective stress relationship proposed by Martins (1983) has any connection with the viscous part of vertical effective stress. For this purpose, long-term oedometer tests with secondary compression under different values of were performed on a natural sample extracted from the soft clay deposit of Ilha do Fundão, RJ. Martins‟ (1983) expression was then applied to the end of secondary line (EOS), showing that it is not explicitly linked to viscosity, but to soil structure.