THE EFFECTIVENESS OF JOINTED CUT-OFF WALLS BENEATH DAMS ON PERVIOUS SOIL FOUNDATIONS

This paper examines the problem of assessing the effectiveness of cut-off walls composed of jointed elements, as in interlocking contiguous bored piling, concrete diaphragm walls and steel sheet piling. A new definition for head efficiency is proposed to account for the significant head losses that occur within the zones of radial flow on each side of a jointed cut-off wall. Approximate theoretical expressions are derived for the head efficiency of a fully penetrating jointed cut-off wall for the cases of open joints and infilled joints, taking into account the frequency of joint spacing, the width of joint gap and the length of the joint flow path. A numerical example provides comparative performance data for the tree main types of jointed cut-off wall. On the basis of experimental data obtained for partially penetrating, perforated diaphragms tested in a hydraulic model, some broad points are made regarding the effectiveness of partially penetrating, jointed cut-off walls. A number of case histories which provide field piezometric data for installed cut-off walls are examined and some general trends in performance are indicated. /Author/

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    76 Ongar Road
    Brentwood,   England 
  • Authors:
    • Telling, R M
    • Menzies, B K
    • SIMONS, N E
  • Publication Date: 1978-5

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 27-37
  • Serial:
    • GROUND ENGINEERING
    • Volume: 11
    • Issue Number: 4
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00178887
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 27 1978 12:00AM