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  Recovery of Collapse and Restoration of Tunnel Belonging to the Water Supply System

  Underground structures require maintenance services and, if necessary, recovery, since they may suffer structural damage both during its construction as during its lifetime, by natural wear and tear or for associated geological-geotechnical risks. This article presents the measures adopted for recovery of collapse and tunnel restoration, executed by NATM method, located in the city of Mogi das Cruzes and belonging to the water supply system of São Paulo City, Brazil. We also present local geological aspects, diagnosis of rupture occurred, inspections and mapping of excerpts to be strengthened, short, medium and long term measures to be adopted and geological-geotechnical risks after recovery of the collapse.

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