STP654: In Situ Determination of Dynamic Soil Properties

    Wilson, SD
    Executive vice president, senior associate engineer, vice president, Shannon & Wilson Inc., Seattle, Wash.

    Brown, FR
    Executive vice president, senior associate engineer, vice president, Shannon & Wilson Inc., Seattle, Wash.

    Schwarz, SD
    Executive vice president, senior associate engineer, vice president, Shannon & Wilson Inc., Seattle, Wash.

    Pages: 23    Published: Jan 1978


    Abstract

    Geophysical procedures used to determine the shear modulus for soils are reviewed and the more recent improvements in each technique are discussed. The two most commonly used methods are identified and shear wave velocities by both methods are compared for nine different sites. Considering all of the variables involved in both the test procedures and the soil types, the agreement is considered good. Two newly developed large-strain procedures for obtaining soil properties in situ are also presented. One method is an impulse test which determines with closely spaced waveform measurements the change in shear wave velocity both as a function of depth and strain. The other method is a back-calculation procedure which corrects assumed model properties until agreement is reached between the calculated and field-measured response. Both methods offer promise for the future development of better large-strain field procedures for conducting more complex seismic studies.

    Keywords:

    geophysics, soil dynamics, seismic velocities, shear moduli, field tests, large-strain tests, soils


    Paper ID: STP35683S

    Committee/Subcommittee: D18.09

    DOI: 10.1520/STP35683S


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