1,000-FT STRETCH OF A DAM SINKS

A 1,000 foot stretch of a rolled earthfill dam under construction on the Wesbranch of the Mahoning River near Warren, Ohio, has sunk about 1 foot. A water laden layer of porous clay about 30 to 90 feet below the stream bed is responsible for the settlement. High pore pressures gave the clay beneath the dam an artificial strength. Water trapped in the interstices between minute particles of clay does not leave the clay under normal conditions. However, under extreme pressure, such as the weight of an earthfill dam the water is forced out and settlement follows. To solve the problem electro-osmosis is used to remove the water rapidly and under controlled conditions. About 1,000 holes of 14 inches in diameter will be drilled on or near the crest of the almost complete dam. An eductor pump and a cathode will be inserted in each hole and backfilled with sand. The remaining holes will be only 6 inches in diameter, large enough to insert pipes to lower anodes (the positive poles) it induces the flow of water towards the cathodes in the wells. Although electro-osmosis has been used before to stabilize slopes, it has never before been applied to this use or on such a broad scale.

  • Availability:
  • Corporate Authors:

    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  USA  10036
  • Publication Date: 1965-8-19

Media Info

  • Pagination: p. 14
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00262531
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 13 1974 12:00AM