Seismic response of cracked soil deposits

摘要

This paper examines the influence that cracks and discontinuities can have over the seismic response of a hypothetical soil profile using a bidimensional finite difference model. The soil is considered as having a bilinear behavior using a Mohr-Coulomb model. The soil openings are simulated with interface elements, where the soil stiffness is used to characterize the contact force when the crack closes. Transmitting boundaries were used at the edges and bottom of the model to allow for energy dissipation of the reflected waves. The effect of cracking in the seismic response was evaluated comparing the results of site response analysis with and without discontinuities, for several lengths and orientations. From the results of this investigation, insight was gained regarding the effect that discontinuities may have in the seismic response of soil deposits and soil-structure systems.