Details are given of a new system known as geodrain, developed and marketed by Terrafigo AB of Gothenburg, Sweden, for draining a clay soil to induce settlement before building work starts. The system consists of a ribbed plastic strip enclosed in a paper sleeve of wet strength through which water can filter when the geodrain has been installed in the ground. The device measures 4mm by 100mm and is supplied in rolls of about 150M in length. The geodrain works on broadly the same principle as the sand drain. Comparisons have been carried out between both types of drain at the Swedish Geotechnical Institute. The ground consisted of loose post glacial clay with an underlay of glacial varved clay. Results showed that with geodrain the horizontal surface movement was restricted to a maximum of 5mm whereas with the sand drains the total horizontal movement was around 100 mm. Shear strength of the soil in the immediate vicinity of the geodrain during installation was reduced by only 5% compared with 30% for a sand drain. Various types of machinery can be used to install geodrains in all cases lighter than that needed in the installation of sand drains. /TRRL/

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    32 Southwark Bridge Road
    London SE1 9EX,   England 
  • Publication Date: 1975-5-29

Media Info

  • Features: Photos;
  • Pagination: p. 29
  • Serial:
    • Volume: 265
    • Issue Number: 4995
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00127782
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Dec 3 1975 12:00AM