MOVEMENTS OF ARTICULATED CONDUITS UNDER EARTH DAMS ON COMPRESSIBLE FOUNDATIONS

Twenty low dams containing articulated conduits whose movements were observed during and after construction are analyzed. The data is systemetized by expressing movements in terms of the observed strain ratio, i.e. the maximum horizontal extension strain divided by the average vertical strain in the foundation beneath the point of maximum settlement. According to a simple elastic analysis, the value of this ratio depends on the embankment and foundation geometry, the maximum embankment loading, and the equivalent elastic properties of the foundation. A finite element analysis clarifies the effects of the independent variables on the strain ratio and has emphasized that the strain ratio increases roughly with the square of Poisson's ratio, for values of Poisson's ratio in the range from 0.20 to 0.45. In comparing observed strain ratios with theoretical values, Poisson's ratios between 0.1 and 0.35 are needed to match theory with observations. Where the foundation layer is thin and over consolidated beyond the maximum embankment load the deformations are compatible with a value of Poisson's ratio of 0.1 to 0.2. For thicker, softer and more compressible foundation the observed values correspond to a Poisson's ratio of 0.3 to 0.35. In extending the conclusions drawn from these observations to the evaluation of spreading of larger dams, it is important to consider the possibility that higher effective Poisson's ratios will be seen than in these low structures.

  • Corporate Authors:

    John Wiley & Sons, Incorporated

    111 River Street
    Hoboken, NJ  United States  07030-6000
  • Authors:
    • Rutledge, P C
    • Gould, J P
  • Publication Date: 1973

Subject/Index Terms

Filing Info

  • Accession Number: 00096418
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 15 1975 12:00AM