Velocity changes associated with generalized triaxial deformation of pyrophyllite |
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| Authors: | C H Sondergeld I C Getting H A Spetzler G A Sobolev |
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| Institution: | (1) Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA, 80309 Boulder, Colorado, USA;(2) Cooperative Institute for Research in Environmental Sciences, University of Colorado, 80309 Boulder, Colorado, USA;(3) Department of Geological Sciences, University of Colorado, 80309 Boulder, Colorado, USA;(4) Institute of the Physics of the Earth, Academy of Sciences of the U.S.S.R., Moscow |
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| Abstract: | Compressional and shear-wave velocities (V
p
andV
s
) were measured during the generalized triaxial deformation (i.e.
1
2=2
3) of pyrophyllite. Observed velocity changes could be ascribed to crack development during dilatancy. Velocity changes were very localized with respect to the ultimate failure plane. The orientation and development of the failure plane was continuously observed with laser holography. Velocity reverals, i.e. changes from a decreasing trend to an increasing trend, were documented in a wet sample in bothV
p
andV
s
. These changes in bothV
p
andV
p
are inconsistent with dialatancy-diffusion models. The reversals were interpreted as a reflection of local stress reorientation caused by a slowly propagating fault. |
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| Keywords: | Rock mechanics Dilatancy-diffusion Velocity changes |
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