Details are given of an ex-gravel pit site at Thorpe, near Staines, Surrey, where dynamic consolidation and vibro-compaction are both being used. The pit was below the water table and filled with water; it had been filled with domestic and industrial refuse over the last 13 years. Prior to soil stabilization, the site was cleared of trees and shrubs and stripped of topsoil. An 800 mm thick granular surface was laid over 6 M of rubber fill. The programme of dynamic consolidation required repeated tamping using 7 chops of a 15 t-plus steel and concrete weight from a height of 12 M over a 12 M 2 grid. Strength and compressibility of the ground were tested with pressure meters and the Dutch core system. After additional filling the site level was reduced by approximately 240 mm. Further tamping was then undertaken. Consolidation by tamping was restricted to within 10 M of three vulnerable boundaries. Vibro-compaction of the perimeter has been started with a vibrator/poker using high pressure water to assist penetration. The overall load on the site is in the region of 200 kn/m 2, and substantial settlement of the topsoil is expected. #140000 is the figure quoted for the whole operation. (TRRL)

  • Availability:
  • Corporate Authors:

    IPC Building and Contract Journals Limited

    Surrey House, 1 Throwley Way
    Sutton, Surrey SM1 4QQ,   England 
  • Publication Date: 1981-1-29

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 20-21
  • Serial:
    • Volume: 299
    • Issue Number: 5285
    • Publisher: Reed Business Information, Limited
    • ISSN: 0010-7859

Subject/Index Terms

Filing Info

  • Accession Number: 00335023
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1981 12:00AM