The construction is discussed of five rock tunnels in a 27 km long tunnel system in Peru. The cross-section of the tunnels inside the clearance line was 38 sq M to accommodate a single line of standard gauge railway track. Although geological studies predicted competent granodiorite with almost no support or rockbolting requirements, the application of shotcrete over almost the total length of the tunnels was required to prevent loosening of the rock joints. Another corrective action found necessary was to change the tunnel section and the shape of the steel sets from an "inverted U" to a "horse-shoe" section with curved walls to resist ground pressure. The article also considers the choice of drilling equipment, and ground support systems with particular emphasis on shotcrete application and control. The effect of changing geological conditions on equipment used and contractors' claims are considered. /TRRL/

  • Availability:
  • Corporate Authors:

    Morgan-Grampian Limited

    30 Calderwood Street
    London SE18 6QH,   England 
  • Authors:
    • Peyfuss, K F
  • Publication Date: 1977-1-2


  • English

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 31-35
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00163874
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Feb 16 1978 12:00AM