An underlying layer of peat on a 650-ft (198-m) stretch of Massachusetts Route 139 has required nearly constant resurfacing of the roadway. The moisture content of the peat remained at 300-400%, resulting in the consistent breakdown of the roadway surface and its underlying components. The design engineers originally believed that the best solution was to drive steel sheet piling, remove the soft soil, and replace it with select structural backfill. However, one of the bidders on the project proposed a much less costly method using the Prism Foundation Improvement System that would create a stable working platform over the subgrade. The plan involves the installation of wick drains to help consolidate the soft, saturated soils and the use of a flexible mechanically stabilized earth wall to create a vertical surcharge and consolidate the peat soils. Consolidation in this manner increases subgrade soil strengths allowing for minimal postconstruction settlement of the roadway. The vertical walls also prevent impact on the surrounding wetlands.

  • Availability:
  • Supplemental Notes:
    • Included in a special advertising section to this journal issue entitled, "Hot Markets."
  • Corporate Authors:

    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  United States  10036
  • Publication Date: 1999-3-15


  • English

Media Info

  • Features: Photos;
  • Pagination: p. H11
  • Serial:
    • ENR
    • Volume: 242
    • Issue Number: 11
    • Publisher: McGraw-Hill, Incorporated
    • ISSN: 0891-9526

Subject/Index Terms

Filing Info

  • Accession Number: 00762866
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 28 1999 12:00AM