IMPROVEMENTS IN DIVERSION TUNNEL DESIGN

Large cross-section tunnels were used for river diversion during the construction of several high-head hydroelectric schemes. All the tunnels were designed to operate under free-and pressure-flow conditions. The Nurek I and Toktogul tunnels were unregulated; they were designed to operate only in the first stage of construction-flood diversion, before resevoir filling. The leaf gates installed in these tunnels were designed for single closure for their isolation. The Charvak and Nurek II tunnels were used to pass the construction floods during both stages. During the second stage, i.e. reservoir filling for the commissioning and operation of the State I turbogenerator units, the flow through the Charvak and Nurek II tunnels was regulated by radial (sector) gates. These gates were designed for a maximum head of 80 and 110 m respectively. The Toktogul and Nurek tunnels have a flat-bedded cross- section, the Charvak has a circular profile. The reinforced concrete linings of all tunnels were designed to prevent cracking. Recommendations are presented regarding lining design and invert linings in particular. The operating record of these large size tunnels have demonstrated the possibility of reducing materials and labor input in similar tunnels of large cross sections.

  • Supplemental Notes:
    • Translated from Gidrotekhnicheskoe Stroitelstvo, No. 8, August 1975, pp 2-6.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  USA  10017-2398
  • Authors:
    • Kuperman, V L
    • Mostkov, V M
    • Ilyushin, V F
    • Krasilnikova, T E
    • Semenkov, V M
    • Sharkunov, S V
  • Publication Date: 1975-8

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 710-715
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00145054
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 13 1977 12:00AM