Modeling of 1D wave propagation in nonlinear soils using the elasto-plastic Iwan model by four numerical schemes

Diego Mercerat (1) , Luis Fabian Bonilla (2) , Florent de Martin (3) , Elise Delavaud (4) , Nathalie Glinsky (1, 2) , Jozef Kristek (5, 6) , Peter Moczo (5, 6) , Elif Oral (4) , Aneta Richterova (5) , Maria Paola Santisi d'Avila (7)

1 Cerema Equipe-projet MOUVGS - Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Equipe-projet MOUVGS
2 IFSTTAR/GERS/SV - Séismes et Vibrations
3 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
4 IRSN - Institut de Radioprotection et de Sûreté Nucléaire
5 FMPH/UNIBA - Faculty of Mathematics, Physics and Informatics [Bratislava]
6 Geophysical Institute
7 UNS UFR Sciences - Université Nice Sophia Antipolis - Faculté des Sciences

The international project PRENOLIN is focused on verification and validation of numerical codes for ground motion simulations including nonlinear soil rheologies. In this particular study, we present implementations of the elasto-plastic Iwan model (Iwan, 1967) into numerical schemes based on finite-difference, finite element, spectral element and discontinuous Galerkin methods, and results based on test numerical simulations. We study the amplification of ground motion in a soft layer with nonlinear behavior overlying a halfspace with linear behavior. We assume a vertically incident plane SH wave with source-time function given by a Gabor wavelet. We include different amplitude levels and frequency ranges. Special attention is given to the hysteresis loops and the reversal points in the stress-strain plane, and their effects on the computed seismograms and corresponding transfer functions. We compare key aspects of the individual numerical schemes and methods, and their advantages and disadvantages.

Domaines: Planète et Univers [physics]; Autre; Informatique [cs]; Modélisation et simulation; Planète et Univers [physics]; Sciences de la Terre; Géophysique [physics.geo-ph]; Sciences de l'ingénieur [physics]; Génie civil; Géotechnique; Sciences de l'ingénieur [physics]; Mécanique [physics.med-ph]; Mécanique des matériaux [physics.class-ph]

Diego Mercerat, Luis Fabian Bonilla, Florent de Martin, Elise Delavaud, Nathalie Glinsky, et al.. Modeling of 1D wave propagation in nonlinear soils using the elasto-plastic Iwan model by four numerical schemes. Seismological Society of America, 2015 Annual Meeting, Apr 2015, Pasadena, United States. ⟨hal-01143333⟩