In some simulations, large modulus reductions have been noticed in areas remote from regions of plastic flow (e.g., near the base of the model). It appears that the use of a single modulus reduction curve is unrealistic in these cases. There is evidence (e.g. Darendeli 2001) that degradation curves depend on the mean stress level. For instance, at depth (high mean stress) there is less damping and modulus reduction. By making the hysteretic damping depth-dependent, the simulation should be more realistic [FLAC3D-5.0]. In this respect, I wonder whether considering this point would exert conspicuous effects on results or not? How can we apply the above-mentioned hint in FLAC?
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