This report analyzes the use of loose clam shell as an embankment material over a soft organic soil, and presents a survey of literature on the behavior of organic soils and methods of treatment for such soft foundations. Laboratory measurements, an experimental test embankment, and a fully instrumented test section of a newly relocated four-lane highway are highlighted. Utilization of lightweight fill material has solved a number of problems associated with the construction of embankments on soft organic soils. The instrumented embankment, composed of claim shell in a loose bulk form, developed into a homogeneous, monolithic, floating slab of considerable dimensional stability and strength. Effects of differential settlement were minimized by the elastic properties of the shells and the general flexibility of the fill in distributing deformations over a large surface. Although settlement is not eliminated by the use of lightweight material, it is greatly reduced as compared to that of a sand fill embankment. The SSOILS computer program ably demonstrated that it is capable of predicting the subsidence of the shell embankment over a soft organic soil, apparently limited only by the quality of the data input. (Author)

  • Availability:
  • Corporate Authors:

    Louisiana State University, Baton Rouge

    Division of Engineering Research
    Baton Rouge, LA  United States  70803
  • Authors:
    • Arman, A
    • SeGall, R
  • Publication Date: 1980

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 117 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00330593
  • Record Type: Publication
  • ISBN: Bulletin No. 119
  • Report/Paper Numbers: FHWA-LA-79-209L
  • Files: TRIS
  • Created Date: Jun 12 1981 12:00AM