WICK DRAINS EMPLOYED FOR BELFAST MOTORWAY EXTENSION

Vertical drains have been used on the M2 motorway to accelerate the consolidation of settlement of an embankment built on underlying deposits of sleech, a soft silty estuarine clay. Two trial sections were built, one using conventional sand drains, and the other a prefabricated wick drain. The results indicated that the mebra prefabricated wick drain was the most economic and satisfactory settlement would occur in 18 months with drains compared to six years without them. The drain used employed an impregnated paper filter encasing a polyethylene case provided with 38 channels. The drains were installed at varying spacings, along the line of the embankment depending on its height. Pre-drilling through old concrete foundations, rubble and other near-surface obstructions was needed. Using a single main installation rig and two pre-drilling units, an average of 730 drains were placed per week. (TRRL)

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Publication Date: 1980-9

Media Info

  • Features: Photos;
  • Pagination: p. 38-41
  • Serial:
    • GROUND ENGINEERING
    • Volume: 13
    • Issue Number: 6
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00334097
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM