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.