Seismic Response Of Cracked Soil Deposits
Author(s)
F. A. Flores & J. M. Mayoral
Abstract
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 soilstructure
systems.
Keywords: cracks, interface, seismic, finite difference model.
1 Introduction
The presence of cracks or fissures on rigid soils, such as stiff clays or sandy silts,
is generally related to particular subsoil conditions combined with external
environmental phenomena such as long periods of drought or excessive water
extraction from underground aquifers. These natural discontinuities may affect
both the static and seismic performance of structures sitting on top of them.
In this work, the influence of cracks and discontinuities (closed cracks) in the
seismic response of a hypothetical soil deposit, and a six-story building located
near by the crack, is assessed using a two-dimensional finite difference model. In
this paper a discontinuity is considered as a closed crack. Thus full contact exists
between both edges. Therefore only compressional forces are transmitted
normally to the interface from one edge to the other. The site response is
Keywords
cracks, interface, seismic, finite difference model.
Related Book
Other papers in this volume
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