FE PREDICTION OF BEARING CAPACITY OF SHALLOW FOUNDATION ON ROCK MASS BY USING AN ELASTO-PLASTIC HOEK-BROWN CONSTITUTIVE MODEL

Christianne de Lyra Nogueira Nogueira¹; Jefferson Tales Simão Simão¹

¹ UFOP

doi:10.20906/CPS/CILAMCE2015-0253

Resumo

This paper presents a numerical simulation of bearing capacity problem of shallow foundations on rock mass. Using the finite element method (FEM), the study analyzes the problem considering plane strain and axisymmetric conditions. The rock mass is modeled as an associative elastic-plastic Hoek-Brown material. The ultimate bearing capacity numerically obtained is compared to solutions obtained by using limit equilibrium and limit analysis. Good agreement is observed between the limit equilibrium and numerical results for purely cohesive material. Results obtained by a parametric study, varying the Geological Strength Index (GSI) highlight the importance of accounting for the impact of the geological condition of the rock mass on the bearing capacity.

Palavras-chave: FEM; Bearing Capacity; Shallow Foundation; Hoek-Brown; Rock Mass