ABSTRACT
The increasing urban transport demand in São Paulo, Brazil leads to the construction of new projects such as tunnels and roads. The main attention should be paid, particularly, to the range of induced soil deformations in depth and at ground level and potential effects on surrounding structures when the tunnels are excavated by conventional methods. The Rodoanel Norte Lot 5 is part of a 44 Km road project, which connects São Paulo, Guarulhos and Arujá. The one kilometer double tunnel was excavated by means of the Sequential Excavation Method, through a mixed geological formation. Ground surface displacements of approximated 150 mm in the initial 20 m of the east portal tunnel drive are measured. These displacements are been analyzed and correlated with excavation phases and ground topography. The approach presented on this article is a three dimensional numerical back-analysis of the section considered.
