PILE HEAVING IN CLAY - COUNTERMEASURES BY USING SALT IN OSLO, NORWAY

OPPRESSNING AV PELER RAMMET I LEIRE. SIKRING VED BRUK AV SALT OSLO, NORGE

Friction piles of timber driven into deep, soft clay strata have a tendency to creep up again after the driving is completed. This procedure takes place within 15-30 minutes either immediately, or later on when other piles are being driven, and can amount to as much as 7-8 M. In the investigation described, pile driving on five Norwegian working sites with similar ground conditions was studied and in those cases where pile heaving also occurred various countermeasures were tested. According to the findings of this study the horizontal deformation of the ground caused by the penetration of piles increases the forces acting upwards on the already driven piles due to their conical shape. In cases where a combined concrete/timber pile was used the heaving could be avoided or much reduced. Single factors found to have little or no effect were: sensitivity ratio of the clay, total number of piles driven and spacing of the piles. Four methods to suppress the heaving were studied: loading of each pile, using a heavier drop hammer, driving the piles in various orders or inserting salt if the heaving occurred in combination with sensitive clay. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00422177
• Corporate Authors:

  Svenska Vag-Och Vattenbyggaren Riksforband

  Regeringsgaten 98
  S-11139 Stockholm,   Sweden 
• Authors:
  • Rygg, N
• Publication Date: 1976

Language

• Norwegian

Media Info

• Features: Photos; Tables;
• Pagination: p. 73-74
• Serial:
  • Vag-Och Vattenbyggaren
  • Volume: 22
  • Issue Number: 819
  • Publisher: Svenska Vag-Och Vattenbyggaren Riksforband
  • ISSN: 0042-2177

Subject/Index Terms

• TRT Terms: Clay; Friction; Lifting equipment; Loads; Pile driving; Prevention; Salts; Sodium chloride; Soft soils; Soils; Support piles; Timber
• Uncontrolled Terms: Heaving
• Old TRIS Terms: Softness
• Subject Areas: Geotechnology; Highways; Security and Emergencies;

Filing Info

• Accession Number: 00149660
• Record Type: Publication
• Source Agency: Swedish National Road and Traffic Research Institute
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Jun 22 1977 12:00AM