The effect of joint conditions on the longitudinal and flexural wave velocities of a rock mass

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The behavior of a jointed rock is different from that of an intact rock, and the characteristics of elastic wave propagation in a jointed rock are different from those of an intact rock. In this study, a rock resonant column testing device is designed to measure the longitudinal and flexural wave velocities of jointed rocks under different states of stress. A column of more than 12 rock discs is stacked on a steel base, which acts as a free-fixed system. This configuration ensures that waves propagate under an equivalent continuum condition, thereby rendering a constant and unique velocity. The effect of joint conditions on the wave velocities is investigated through rock resonant column testings. The results show that velocities are sensitive to the state of stress and increase nonlinearly with stress. The velocities are also affected by joint conditions such as roughness, spacing, and filling. The results are useful for rock mass classification based on near-surface geophysical characterization.
Publisher
Trans Tech Publications
Issue Date
2006
Keywords

elastic wave velocity; joint condition; jointed rock; rock mass classification

Citation

Key Engineering Materials : v. 321/323 no.1, pp.306-309

ISSN
1013-9826
URI
http://hdl.handle.net/10203/7341
Link
http://www.scientific.net/0-87849-412-x/6.html
Appears in Collection
CE-Journal Papers(저널논문)

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