The primary purpose of this paper is to describe and present the results of an experiment in which the loads on three 44-in. OD pipe culverts were measured during a 21-year period from 1927 to 1948. The 3 culverts of concrete, cast iron, and corrugated steel were under a 15-ft embankment. The measured loads are compared with loads calculated by the Marston theory of loads on underground conduits. In addition, settlement measurements of the soil at several horizontal planes in the embankment were made for the purpose of verifying the concept of a "plane of equal settlement," which was discovered by Marston on the basis of pure mathematical reasoning and which plays such an important role in the theory. The measured settlements were also used to determine actual values of the settlement ratio for use in calculating loads on the pipelines. A review of the theory is presented, particularly the mathematical determination of the height of the plane of equal settlement above the top of the conduit. The comparison between measured and calculated loads indicates the general correctness and reliability of the Marston theory. It is also shown that there is a substantial difference between loads on a flexible conduit and those on a rigid conduit because of the difference in values of the settlement ratios that are characteristic of those conduit types. The 21-year measurements of load indicated no substantial increase or decrease of load in that period of time.

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  • Supplemental Notes:
    • Publication of the paper sponsored by Committee on Subsurface Structures Design. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
  • Authors:
    • Spangler, Merlin G
  • Conference:
  • Publication Date: 1973

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 1-14
  • Monograph Title: Structural performance of drainage structures
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00048230
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jan 11 1974 12:00AM