Effects of filling fluid type and composition and joint orientation on acoustic wave propagation across individual fluid-filled rock joints

The Attenuation Ability of Saturated Joints Filled with Granular Materials under High-Amplitude Stress Wave Loading

“…Their results showed that the increase of the joint thickness could cause more wave attenuation, while the increase in the water content could lead to less wave attenuation. Their further investigation indicated that the type of filling liquids in rock joints also played an important role in the seismic responses of jointed rock masses [27]. Huang et al [28] performed a series of dynamic tests investigating stress wave propagation through a liquid-filled rock joint under undrained conditions, and they found a negative correlation between the peak water pressure value and the transmission coefficient.…”

Alteration of ultrasonic signatures by stress-induced changes in hydro-mechanical properties of fractured rocks

“…16 In particular, the alteration of the flow characteristics in fractured formations can be monitored using seismic waves as high-resolution probes, sensitive to different geological conditions such as temperature, overburden and pore pressures, saturation level, and depth of interest. [16][17][18][19] As seismic waves propagate through a fractured medium, frequency-dependent elastic interface waves are generated, which are categorized into fast and slow interface waves with velocities ranging from shear-wave (upper limit) to Rayleigh-wave (lower limit). [20][21][22][23] While the energy of these interface waves depends on stress states and fracture geometry, 21,24 a direct relationship exists between fracture-specific stiffness and propagation of interface waves.…”