In SituAssessment of theG–γCurve for Characterizing the Nonlinear Response of Soil: Application to the Garner Valley Downhole Array and the Wildlife Liquefaction Array

• DOI: 10.1785/0120140209
• Publication Date: 2015-02-26T10:17:59Z
• Authors: Johanes Chandra; Philippe Guéguen; Jamison H. Steidl; Luis Fabian Bonilla
• Keywords: Shear modulus; Geophone

Abstract We analyze the nonlinear and near‐surface geological effects of two Network for Earthquake Engineering Simulation at University California, Santa Barbara (NEES@UCSB) instrumented sites: Garner Valley Downhole Array (GVDA) Wildlife Liquefaction (WLA). The seismic interferometry by deconvolution method is applied to earthquake data recorded multisensor vertical array between January 2005 September 2013. Along cross section, local shear‐wave velocity extracted estimating travel time sensors. S ‐wave profiles are constructed compared with classical in situ geophysical surveys. show that values change according amplitude ground motion, we find anisotropy east–west north–south directions GVDA site. ratio average peak particle v * boreholes tested as a deformation proxy. Using acceleration , versus curve used represent stress–strain observing site’s responses under different levels excitation. Nonlinearity observed from quite low shear‐strain (∼1×10 −5 ) classic hyperbolic model derived. proves be good Finally, shear modulus degradation curves each depth test site, they similar previous laboratory measurements or A simple comparison regarding behavior WLA performed.