Reproducible SPT Hammer Impact Force with an Automatic Free Fall SPT Hammer System

    Volume 6, Issue 4 (December 1983)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Page Count: 9


    Riggs, CO
    Research engineer and president, Central Mine Equipment Company, St. Louis, MO

    Schmidt, NO
    Professor of civil engineering, University of Missouri at Rolla, Rolla, MO

    Rassieur, CL
    Research engineer and president, Central Mine Equipment Company, St. Louis, MO

    Abstract

    Stress wave energy measurements were made to compare the performance of an automatic standard penetration test (SPT) hammer system with the free fall performance of a safety type hammer. It was found that the automatic free fall hammer and the safety hammer tested in free fall provide practically the same mean peak force at impact and the same mean driving energy. The coefficient of variation of measured stress wave energy during any test series of the automatic hammer system is relatively small and usually in the range of 1 to 2%.


    Paper ID: GTJ10925J

    DOI: 10.1520/GTJ10925J

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    Author
    Title Reproducible SPT Hammer Impact Force with an Automatic Free Fall SPT Hammer System
    Symposium , 0000-00-00
    Committee D18