The eastbound embankment for a distance of 300 feet along centerline subsided 3 feet when it reached a height of 47 feet. The resulting mudwave was observed a distance of 250 feet beyond the toe of fill. An investigation program was carried out to determine the cause of the slide since this was not the usual form of a circular arc failure. The cause of the failure was the existence of a 5 feet thick silt and sand layer sandwiched in between a stiff clay layer above and a soft to medium clay layer below. As the soft clay consolidated, the pore water migrated to the silt and sand layer causing a build up of pore pressure with some lateral transfer through this layer. This reduced the shearing strength at the silt and sand - soft clay interface resulting ultimately in a wedge type failure. /Author/

  • Corporate Authors:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Gemme, R L
  • Publication Date: 1976-12

Media Info

  • Features: Figures;
  • Pagination: p. 44-51
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00148213
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: Mar 15 1977 12:00AM