ABSTRACT
Major tunneling works in the city of São Paulo have started in the 1970´s, with the construction of the 1st Metro Line. Since then, tunnels with different cross sections have been constructed regularly, using either mechanized or conventional tunneling methods. From a geological point of view, the city is mainly located in a sedimentary basin, with its subsoil partly composed by residual soils overlaying bedrock. Experience has shown that the induced settlements in the residual soils are higher and more variable. Historic registers of tunneling induced settlements measured for different constructive techniques and soil types are presented on this paper. Focus is given to the measurements during the construction of Metro Line 4, where approximately 5 km of line tunnels were excavated using NATM in residual soils, saprolite and rocks, and around 8 km were excavated in tertiary sediments, using an EBM TBM. Typical values for volume losses on this context are proposed.
