GEOCOMPOSITE DRAINAGE SYSTEMS: HIGHWAY EDGE DRAINS AND RETAINING WALL SHEET DRAINS. FINAL REPORT

This project has focused on geocomposite drainage systems made from various types and configurations of polymeric drainage cores covered by polymeric geotextile filters. The cores are available in a wide variety of shapes; for example, columns, nubs, cuspations, meshes, dimples, etc. The geotextile filters are bonded directly into the cores. Two major applications areas were addressed in this project. The first application is that of highway edge drains in which the drainage cores are generally 12 in. or 18 in. high and completely surrounded by the geotextile filter. They are placed vertically in the ground immediately adjacent to highway pavement base courses for the purpose of accepting lateral drainage. The second application is that of retaining wall drainage in which the drainage system completely covers the backfilled side of the wall with the geotextile filter attached to the side of the core facing the backfilled soil. Their purpose is to drain the backfill soil thereby relieving hydrostatic pressure against the back of the wall. Each of the two application areas were addressed in an identical manner: a literature review, design calculations (regarding core strength, core flow rate, geotextile permeability, geotextile opening size and geotextile strength), testing of various commercial products and a generic specification. The report is written accordingly.

  • Corporate Authors:

    Koerner (RM), Consulting Engineer

    130 Wood Road
    Springfield, PA  United States  19064

    Pennsylvania Department of Transportation

    Office of Research and Special Studies, P.O. Box 2926
    Harrisburg, PA  United States  17120

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Koerner, R M
    • Hwu, B-L
  • Publication Date: 1989-12

Media Info

  • Features: Figures; Tables;
  • Pagination: 115 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00493600
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-PA-89-023+85-15, Proj No. 88-15
  • Contract Numbers: 258815
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 30 1990 12:00AM