Two embankments on fifteen to twenty-five feet of soft organic silt were constructed within an urban area. Construction was to be accomplished as fast as possible with due consideration to the absolute safety of an adjacent 48-inch diameter water main, heavily used railroad tracks and underground utilities. Vertical consolidation settlements were estimated from studies to be up to 2 feet with lateral subgrade displacements (consolidation) at the embankment toes from 4 to 6 inches. Overall embankment stability was determined to be marginal. The embankments were built in several stages with delay periods governed by data from a foundation soil instrumentation program. The instrumentation consisted of inclinometers, piezometers and settlement monuments located near critical sections of the embankment and the water main. The embankments were safely constructed several months ahead of the proposed 9-month stage construction schedule.

  • Supplemental Notes:
    • This article is an exerpt from the Proceedings of the Fourteenth Annual Engineering Geology and Soils Engineering Symposium that was sponsored by Idaho Transportation Department, Division of Highways; University of Idaho, Department of Geology and Department of Civil Engineering; Idaho State University, Department of Geology and Department of Engineering; and Boise State University, Department of Geology, and Department of Physical Science and Engineering. This symposium was held at the Rodeway Inn, Boise, Idaho, and was hosted by Boise State University.
  • Corporate Authors:

    Idaho Department of Highways

    P.O. Box 7129
    Boise, ID  United States  83707
  • Authors:
    • Mikkelson, P E
    • Bestwick, L K
  • Publication Date: 1976-4-9

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Filing Info

  • Accession Number: 00142671
  • Record Type: Publication
  • Created Date: Feb 1 1977 12:00AM