DEEP COMPACTION WITH VIBRO-WING METHOD

The article describes the construction of an extension of the harbour at Rostock, German Democratic Republic and suggests other possible applications of the method. Some 1.2 million m3 of hydraulic fill was compacted to a maximum depth of 15 m using a long steel rod provided with a number of wings welded to the rod. The unit is driven down into the fill using a high capacity vibrating hammer and then slowly pulled out during continued vibration. Pore water pressure increases rapidly during the compaction around the unit as it is driven into the soil, effectively reducing the effective stress displacing individual sand particles producing a higher relative density. A liquified zone exists around the vibro-wing whose size depends upon the relative density. The greatest advantage of the method is the speed and low cost compared with other deep compaction methods; the thickness of the poorly compacted surface layer is also relatively small. A limitation is that water may have to be added above ground water level. Possible applications described include foundations, harbours, hydraulic fills, dams, especially tailings dams subjected to earthquakes, machine foundations and special structures where compaction has to be done below water. (TRRL)

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  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Authors:
    • BROMS, B B
    • Hansson, O E
  • Publication Date: 1984-7

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 34-36
  • Serial:
    • GROUND ENGINEERING
    • Volume: 17
    • Issue Number: 5
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00393286
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1985 12:00AM