Abstract
The mechanical parameters of a rock fracture are dependent on its surface roughness anisotropy. In this Letter, we show how quantitatively describe the anisotropy of a rock fracture surface. A parameter, referred to as the index for the accumulation power spectral density psd ∗ , is proposed to characterize the anisotropy of a rock fracture surface. Variation of psd ∗ , with orientation angle θ of sampling, is also discussed.
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