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    Induced Dynamic Nonlinear Ground Response at Garner Valley, California

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    2008_06_Lawrence.pdf (1.206Mb)
    Date
    2008-06
    Author
    Lawrence, Zack
    Bodin, Paul
    Langston, Charles A.
    Pearce, Fred
    Gomberg, Joan
    Johnson, Paul A.
    Menq, Farn-Yuh
    Brackman, Thomas
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    Abstract
    We present results from a prototype experiment in which we actively induce, observe, and quantify in situ nonlinear sediment response in the near surface. This experiment was part of a suite of experiments conducted during August 2004 in Garner Valley, California, using a large mobile shaker truck from the Network for Earthquake Engineering Simulation (NEES) facility. We deployed a dense accelerometer array within meters of the mobile shaker truck to replicate a controlled, laboratory-style soil dynamics experiment in order to observe wave-amplitude-dependent sediment properties. Ground motion exceeding 1g acceleration was produced near the shaker truck. The wave field was dominated by Rayleigh surface waves and ground motions were strong enough to produce observable nonlinear changes in wave velocity. We found that as the force load of the shaker increased, the Rayleigh-wave phase velocity decreased by as much as similar to 30% at the highest frequencies used (up to 30 Hz). Phase velocity dispersion curves were inverted for S-wave velocity as a function of depth using a simple isotropic elastic model to estimate the depth dependence of changes to the velocity structure. The greatest change in velocity occurred nearest the surface, within the upper 4 m. These estimated S-wave velocity values were used with estimates of surface strain to compare with laboratory-based shear modulus reduction measurements from the same site. Our results suggest that it may be possible to characterize nonlinear soil properties in situ using a noninvasive field technique.
    Department
    Civil, Architectural, and Environmental Engineering
    Subject
    shear-wave velocity
    site response
    surface-waves
    earthquake
    motion
    strain
    elasticity
    sediments
    boreholes
    arrays
    geochemistry & geophysics
    URI
    http://hdl.handle.net/2152/43261
    Citation
    Lawrence, Zack, Paul Bodin, Charles A. Langston, Fred Pearce, Joan Gomberg, Paul A. Johnson, Farn-Yuh Menq, and Thomas Brackman. "Induced dynamic nonlinear ground response at Garner Valley, California." Bulletin of the Seismological Society of America, Vol. 98, No. 3 (Jun., 2008): 1412-1428.
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