A 'slurry concrete trench' method was used to carry a new trunk road underpass over a major water supply where spread foundations were not practicable and the structure had to be protected from a possible burst water main. Excavation under a bentonite suspension down to the top of weathered mud stone was used. On completion of the excavation, the bentonite is replaced by a slurry concrete mix. A short length of collar casing can then be inserted without vibration into the slurry concrete and it has sufficient strength to be self-supporting when augered out. The installation of the piles inside the collar is discussed. Integrity testing of the piles was restricted to two trial piles, not used in the structure. One of the trial piles was installed through a slurry concrete trench. An undetected layer of sandstone boulders was found 2 M below ground level indicating that normal piling would have been difficult and could have disturbed the water mains. /TRRL/

  • Availability:
  • Corporate Authors:

    Her Majesty's Stationery Office

    Atlantic Ho, Holborn Viaduct
    London EC1P 1BN,   England 
  • Authors:
    • Croxall, M A
  • Publication Date: 1978-3


  • English

Media Info

  • Features: Figures;
  • Pagination: p. 29-30
  • Serial:
    • Construction
    • Issue Number: 25
    • Publisher: Reed Construction Data
    • ISSN: 0045-3900

Subject/Index Terms

Filing Info

  • Accession Number: 00182750
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0 11 724428 7
  • Report/Paper Numbers: Monograph
  • Files: ITRD, TRIS
  • Created Date: Oct 31 1978 12:00AM