On the basis of the observed compression of unloaded piles in a test area in Oslo harbour district the following question arose: To what extent are concrete-filled steel piles driven to rock affected by the consolidation of the surrounding clay? First a description of the subsoil conditions and measuring equipment is given. The compression of the pile was measured by means of thin steel rods which extended from the pile top down to various measuring points; readings were taken with micrometer gauges. Over a two-three year period a considerable compression was measured, mainly in the lower section of the pile. Average stresses acting between the different measuring points were computed; these results are shown diagrammatically for one-year measuring intervals. The frictional forces acting on the pile increase from the top downwards. The author concludes that long piles driven to rock through saft clay susceptible to large consolidation will experience large supplementary stresses. The frictional forces will produce increased pile settlements made up both of compression, deformations and further penetration of the pile tip into the rock. It is assumed that continued measurements will indicate to what extent the influence of these forces must be allowed for when assessing the bearing capacity of a pile.

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  • Corporate Authors:

    Norwegian Geotechnical Institute

    Forsknings Veien
    Oslo 3,   Norway 
  • Authors:
    • Johannessen, I J
  • Publication Date: 1966

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Filing Info

  • Accession Number: 00263621
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 9 1975 12:00AM