Análise da dissipação da poro pressão em torno do piezocone através do método dos elementos finitos.

Abstract

This research work is related to a numerical analysis of the excess pore pressure dissipation phenomenon of the water generated during the piezocone penetration in cohesive soils. An analysis of the influence of an anolated zone near the sidewall of the apparatus was made. The behavior of excess pore pressure dissipation curves with the presence of the angled layer was verified using dissipation models based on a theory of both cylindrical and spherical cavity expansion. A "mixed" model was also first introduced, according to the author's knowledge, to analyze the problem by simulating the expansion of a spherical cavity to the tip of the apparatus and a cylindrical expansion in the region around the friction sleeve. This "mixed" model was used to evaluate the effect of denting and the influence of the porous element position on the dissipation curves. It has been found that the presence of the dented layer has very little effect on dissipation curves compared to the case where the dented layer is present. The position of the porous element in the piezocone showed a marked influence on the densification curves.