A nonlinear constitutive model identified as MRDF-UIUC of cyclic stress-strain behavior of sand available in the DEEPSOIL software (Hashash, et al., 2016) developed at the University of Illinois at Urbana-Champaign (UIUC) by Phillips and Hashash (2009) was calibrated with isotropically consolidated resonant column and strain-controlled cyclic direct simple shear test results of 216 sand specimens obtained from the Bay of Campeche. A very good agreement was found between the computed cyclic stress-strain loops obtained with the calibrated model and those measured in the cyclic direct simple shear tests. The computed normalized shear modulus (G/G/sub max/) values larger than 0.3 and the material damping ratio values larger than 5 % fall within ± 30 % of the laboratory measurements. Overprediction was observed when the values of normalized shear modulus were smaller than 0.3 and the material damping ratio values were smaller than 5 %. The calibrated model is limited to effective confining stress between 0 kPa and 400 kPa, and can be used to perform seismic site-response analyses with the DEEPSOIL software and predict normalized shear modulus curves and material damping ratio curves of Bay of Campeche sand only, when laboratory measurements are not available and the number of tests of the laboratory schedule is not sufficient to obtain a complete geotechnical model of dynamic properties.
Francisco A. Flores López, Ernesto Vega Fernández, Victor M. Taboada, Diego Cruz Roque and Prócoro Barrera Nabor
Keywords: nonlinear constitutive model, static parameters, stress-strain behavior of sand, DEEPSOIL software, confining stress
Publisher: DFI