Both of Brazil's major cities of Rio de Janeiro and Sao Paulo are building underground railway systems through poor ground covered with buildings. Because of the treacherous conditions in Rio the cut-and-fill technique is being used. The ground is a mixture of clays, sands and salty water 2 M below the surface. In the city centre, where the line passes through shops on either side, building settlement is prevented by diaphragm walls and dewatering wells in the trench interior. Threading through the old services has been very difficult. Because of low wages it has been possible to employ over 8000 men in the construction of the 12 km tunnel. Costly method of waterproofing are employed. The new construction at Sao Paulo supplements the existing 17 km stretch that has been in use since September 1975. Most of the 28 km new line will be on the surface, but 9 km will be constructed by the cut-and-cover method, and 3.5 km in bored tunnel using full faced machines with precautions to reduce ground disturbance under buildings. /TRRL/

Media Info

  • Features: Photos;
  • Pagination: p. 14-16
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00138810
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1982 12:00AM