SOIL RESTRAINT AGAINST HORIZON MOTION OF PIPES

Experiments in which the movement of the soil surrounding any subsurface structure is viewed through a glass window (as was the case with the authors, whose pipes spanned the whole width of the test box) have shown that much friction is brought about on the glass face, affecting the "planar" behavior of the structure, and thus the value of p would be affected by the end friction on both box faces. Since it has been found the load-displacement behavior of a pipe is similar to that of a horizontally loaded vertical plate anchor, it should be noted that, with the latter, disturbance of the soil is more pronounced with decreasing embedment depth ratio. This may be the cause of the scatter with the larger diameter pipes. In tests with a 1-1/2 inch (38 mm) diameter horizontally translating rigid vertical plate anchor in medium dense sand, plotting failure displacement versus embedment depth ratio has revealed a linear relationship between the ultimate displacements and the embedment depth ratios. The need in design to tailor soil restraint characteristics to the specific situation (i.e., conduit and local site conditions) is reiterated and consideration is also given to pipe ditch cross section, backfill material and placement, and local ground-water conditions as decisive factors. Because conditions may vary along a given length of pipe, a range of soil restraint characteristics may have to be provided in lieu of a unique p-y curve.

  • Availability:
  • Supplemental Notes:
    • Discussion of Proceeding Paper 13303 by Jean M.E. Audibert and Kenneth J. Nyman, October, 1977.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  USA  10017-2398
  • Discussers:
    • Akinmusuru, J O
  • Publication Date: 1978-9

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Filing Info

  • Accession Number: 00183216
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13999
  • Files: TRIS
  • Created Date: Nov 14 1978 12:00AM