Abstract
To better understand the effects of the microstructural properties of granular rocks such as grain packing geometry, grain shape and size, grain contact properties, and grain scale heterogeneity on the velocities and amplitudes of seismic waves, a numerical approach for modeling elastic wave propagation in granular rock has been developed. The numerical approach employs the boundary integral equation method to model the complete dynamic response of a packing of arbitrarily shaped grains. The effects of dry, fluid-filled, and clay-filled grain contacts are incorporated into the numerical formulation using a discontinuity boundary condition with a complex stiffness parameter. Numerical simulations for SH-wave propagation in an idealized grain packing illustrate the applicability of this technique for investigating the effects of grain contact properties and source frequency on the amplitudes and velocities of elastic waves.
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