Evaluation of SPT Hammer Variability

The first objective of this study is to assess the variability of the SPT hammers used in geotechnical site investigations on Vermont Department of Transportation (VTrans) projects. Using standardized energy measurement techniques, it is expected that the researchers will evaluate four Agency owned and four contractor operated drill rigs for SPT hammer efficiency and variability. The second objective of the research will be to provide an energy correction factor for each of the drill rigs and hammer systems evaluated in the study. The energy correction factor will be applied to field measured N-values by geotechnical engineers to account for variations in hammer efficiency and to standardize field results to N60. As of January 2009, accomplishments include SPT hammer energy data being reduced and tabulated, site and boring location plans have been created, cross-sections of the subsurface stratigraphy have been generated, and the continuation of initial literature review and report text.

    Language

    • English

    Project

    • Status: Completed
    • Funding: $35000.00
    • Contract Numbers:

      SPR 703

    • Sponsor Organizations:

      Vermont Agency of Transportation

      Materials and Research Section
      1 National Life Drive, Drawer 33
      Montpelier, VT  United States  05633
    • Project Managers:

      Benda, Chris

    • Performing Organizations:

      Vermont Agency of Transportation

      Materials and Research Section
      1 National Life Drive, Drawer 33
      Montpelier, VT  United States  05633
    • Principal Investigators:

      Benda, Chris

    • Start Date: 20080407
    • Expected Completion Date: 0
    • Actual Completion Date: 20090407
    • Source Data: RiP Project 17047

    Subject/Index Terms

    Filing Info

    • Accession Number: 01462645
    • Record Type: Research project
    • Source Agency: Vermont Agency of Transportation
    • Contract Numbers: SPR 703
    • Files: RiP, STATEDOT
    • Created Date: Jan 3 2013 2:07PM