ABSTRACT
This paper describes the influence of the k0 parameter (ratio between vertical and horizontal “in situ” stresses) in superficial settlements and liner stresses caused by NATM tunnel excavation in a residual soil massif in São Paulo Line 4 Yellow Subway expansion. Are presented two-dimensional numerical analyses using Finite Diferences Method implemented in FLAC software, for the construction method simulation. The soil behavior is simulated by Linear Elastic model with Mohr-Coulomb envelope.
