PREPARATION OF ROCK FOUNDATIONS FOR EMBANKMENT DAMS

A general description is given of the design of core contacts and the preparation of rock foundations for embankment dams, including dams in which only the core is founded on rock. The geometry of the sound bedrock upon which the core is to be placed should be determined, and particular care must be extended to sites in steep narrow valleys. Dams are frequently arched upstream in plan so that water loads will induce compressive stresses parallel to the axis and thus help prevent transverse cracking. Abrupt changes in section must be avoided. The necessary trimming or excavation should be done very carefully. The hazard of slides in either overburden materials or rock during excavation for the core, spillway or shells must be given important consideration in the planning and layout of the dam. Discontinuities such faults and relief joints which may extend long distances as nearby planar surfaces, require special attention in evaluating and planning for seepage control measures. Details are discussed of foundation preparation and the observation made that procedures for treatment of rock contact surface should be established in the specifications and bidding documents. Comments are made on the drainage of the foundation. Special problems posed by foundations on clay shales are discussed. Various aspects of grouted cutoffs are discussed which include design concepts, field control, mixing grout, grouting equipment, and drilling grout holes. Successful completion of a dam requires competent, experienced supervision working in close cooperation with the designer.

  • Corporate Authors:

    John Wiley & Sons, Incorporated

    111 River Street
    Hoboken, NJ  USA  07030-6000
  • Authors:
    • Swiger, W F
  • Publication Date: 1973

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Filing Info

  • Accession Number: 00096421
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 15 1975 12:00AM