PRACTICAL DESIGN OF CONCRETE DIAPHRAGM WALLS

Diaphragm walls constructed by the slurry trench method achieve their greatest economy when it is possible to use them as part of the permanent underground structure. To use these support-of-excavation structures as permanent components of a structure, engineers must be assured of their compatibility with structures built in an open excavation. There should be consistent reliability in applied loads, levels of stress, watertightness, durability, and performance. It is suggested that the use of diaphragm walls of precast concrete panels can provide reliable strength and durability and that use of a cement bentonite grout on the backside of the diaphragm wall to displace excess slurry can meet waterproofing requirements. It is recommended that plastic analysis be combined with ultimate strength methods in the design of these walls to resolve the problem presented by the complicated residual stress patterns generated in the diaphragm wall by the construction processes of excavation; installation, prestressing, and removal of braces; and backfilling. In addition, use of a built-in hinge in the diaphragm wall at the lowest brace facilitates control of residual moments. This approach can satisfy the need for reliability in stress levels in the structure. A structure so designed and constructed will be compatible with one built in an open excavation. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 37-43
  • Monograph Title: Tunneling and underground structures
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196627
  • Record Type: Publication
  • ISBN: 0309028299
  • Files: TRIS, TRB
  • Created Date: Aug 28 1981 12:00AM