DESIGN CHARTS FOR LONG COFFERDAMS

The author discusses analytical solutions for the seepage into various types of cofferdam illustrating the use of the criteria with examples. The variation of the solution parameters with geometric ratios is examined. These parameters are expressed in terms of the hydraulic head, the coefficient of permeability, the total head at the pile tip and the discharge. It is necessary to determine the depth to which the sheet piles must be driven so that the base of the excavation will be stable. Under certain conditions it is convenient to design against a failure caused by heave of the whole of the soil mass inside the cofferdam. However, there are occasions when it is preferable to design with a safety against piping immediately adjacent to the piling. Equations or diagrams are used in examples to illustrate the use of both criteria. Figures are given in the paper to show the variation of discharge with geometry and the variation of total head at pile tip with geometry for a dam with no excavation in stratum of finite depth. These figures can be used to solve some of the problems. Mild inhomogeneity in the permeable stratum can be treated, and its coefficient of permeablilty must be determined by investigation. (TRRL)

  • Availability:
  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Authors:
    • KING, GJW
  • Publication Date: 1990-12

Media Info

  • Features: References;
  • Pagination: p. 647-650
  • Serial:
    • GEOTECHNIQUE
    • Volume: 40
    • Issue Number: 4
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00619952
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1992 12:00AM