BECKER AND STANDARD PENETRATION TESTS (BPT-SPT) CORRELATIONS WITH CONSIDERATION OF CASING FRICTION

The Becker penetration test (BPT), through correlations with the standard penetration test (SPT), is widely used for foundation design and liquefaction assessment in gravelly soils. Most of the existing correlations, however, do not adequately account for the variable energy output of the diesel hammer used in the Becker system, and shaft friction on the Becker casing is ignored. An alternative and more rational approach to BPT-SPT correlations is presented, based on experimental and numerical studies conducted at the University of British Columbia. The research involves performing SPT, BPT, and other in situ tests at several sites in British Columbia and includes dynamic measurements of energy transfer in the SPT and BPT. Stress-wave measrements and wave-equation analyses are used to evaluate the effect of friction on the BPT blow count. New BPT-SPT correlations are proposed that consider the energy transfer in both tests and explicitly consider casing friction in the BPT. A recommended procedure for estimating equivalent SPT N60 from BPT blow count is presented. (A)

  • Corporate Authors:

    National Research Council of Canada

    1200 Montreal Road
    Ottawa, Ontario  Canada  K1A 0R6
  • Authors:
    • SY, A CAMPANELLA
  • Publication Date: 1994-8

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00780691
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD
  • Created Date: Jan 7 2000 12:00AM