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  Excavation of the Connection Tunnel between Paulista and Consolação stations of the São Paulo Metro: Procedures to minimize settlements and its on-line monitoring

  Due to the close vicinity to the foundations of several buildings, and most of all, to the operating running tunnels of Line 2, the construction of the connection tunnel linking Line 4´s Paulista station with Line 2´s Consolação station of the São Paulo´s Metro system presented important technical challenges. The excavation of the tunnel required special procedures to restrain and monitor the induced settlements. This paper describes the adopted construction sequence and methodology, and the instrumentation used for monitoring settlements on the surface, in the surrounding buildings and existing metro tunnels.

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