DEEP EXCAVATIONS FOR THE MEXICO CITY UNDERGROUND RAILWAY USING ELECTRO-OSMOSIS

EXCAVACIONES PROFUNDAS PARA EL METRO DE LA CIUDAD DE MEXICO EMPLEANDO ELECTROSOSMOSIS

This paper describes the construction method used in deep excavations for the Mexico City underground railway, through a deposit of volcanic clays of high compressibility and very low shear strength. The soil was excavated between two parallel braced walls of reinforced concrete which had been constructed with the use of bentonite mud. Thereafter, the floor slab was constructed, followed by the inner walls and the roof slab. As the stability of the floor of the tunnel was precarious in spite of the pre-existing system of pumping wells, an electroosmotic treatment procedure was used, applied for an average of 8 days for every 31,5 M of length. The results of laboratory tests made before and after the treatment are presented. The increase in the shear strength of the clay exceeded 20 per cent, while its natural water content was reduced by only 3 per cent and subsidence in neighbouring areas did not exceed 5 cm over four months.

  • Supplemental Notes:
    • Sexto Congreso Panamericano de Mecanica de Suelos e Ingenieria de Cimentaciones, Lima, Peru, 2-7 Diciembre 1979.
  • Corporate Authors:

    Comision Organizadora del VI CPMSIF

    Apartado Postal 11076
    Lima,   Peru 
  • Authors:
    • Rodriguez, L B
    • Ruelas, S
    • Escamilla, J M
  • Publication Date: 1979-12

Language

  • Spanish

Media Info

  • Features: Figures; References;
  • Pagination: p. 177-187
  • Serial:
    • Volume: 2

Subject/Index Terms

Filing Info

  • Accession Number: 00325870
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 18 1981 12:00AM