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  Learned lessons from accidents on underground constructions in São Paulo city, Brasil

  In recent decades, the metropolitan area of São Paulo city faced a great number of large underground constructions; with them, some accidents raised questions about engineering solutions in use. The investigation of the factors involved in these accidents brought a great learning experience for professionals linked to the works, such as: the importance of geological and geotechnical most accurate investigation, the increasing use of non-destructive methods (geophysical tests), mapping the excavation fronts for identification of technical features of soils and rocks and the systematic analysis instrumentation, with the establishment of emergency alert levels and contingency plans. This paper aims to discuss the importance of these and other activities regarding design and implementation of urban tunnels.

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