Speaker
Description
Fractured natural and synthetic porous media (like crystalline and sedimentary rocks, concrete, etc. ) induces a number of fluid‐flow mechanisms causing attenuation of waves at different frequency regimes.
In order to characterize fractured porous media, we conducted harmonic fatigue experiments at triaxial stress conditions on fluid-saturated sandstone and concrete samples and characterized the effective material response at different damage stages.
Further, the mechanical response of the porous material is directly characterized from the experimental data in terms of the complex Youngs modulus and the complex Poisson's ratio. This allows
for the description of the evolution of acoustic wave attenuation and phase dispersion induced by local squirt‐flow-type mechanisms.
We will show that the evolution of the effective (hydro-)mechanical properties can be directly linked to the evolution of fractures and thus allows to characterize the damage state of the material without further visualization of the pore morphology. Further, we observe different characteristic attenuation regimes in the frequency domain which can be linked to an effectively drained and undrained porous medium.
| Country | Germany |
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