Abstract
Based on theoretical derivations and considerations, five series of laboratory tests were planned to investigate and differentiate the degrees of inherent and stress-induced anisotropy, to study the effect of void ratio changes on shear-wave velocities and shear moduli, and to determine the relationship between shear-wave velocity and stress state on a completely decomposed tuff (CDT). Shear-wave velocities in three orthogonal horizontal and vertical planes [ vs(hh) , vs(hv) , and vs(vh) ] were measured in both vertically and horizontally cut block and Mazier specimens. Under isotropic stress conditions (K=1.0) , the degrees of inherent anisotropy [ vs(hh) 2 ∕ vs(hv) 2 = Ghh ∕ Ghv ] were 1.48 and 1.36 for the block and Mazier specimens, respectively. At the anisotropic stress state (K=0.4) , the degrees of anisotropy of the block and Mazier specimens were 1.26 and 1.15, respectively, 15% reduction from the measured inherent anisotropy due to stress-induced effects. The measured higher shear-wave velocity ...
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More From: Journal of Geotechnical and Geoenvironmental Engineering
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